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Outcome of scorpion sting envenomation after a protocol guided therapy

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Scorpion sting (SS) envenomation is a life threatening emergency in children, though not so severe in adults. Attempt to develop protocol using prazosin and dobutamine and few other drugs to treat SS. Children aged 0-13 years with a history of scorpion sting were studied. Clinical features, complications, drug therapy and outcome of the cases for the period 1992-97(N = 186) was collected by the authors and also from the medical records department (RETROSPECTIVE GROUP). Cases treated during 1997-2000 (N = 198) as per the protocol were recorded as PROSPECTIVE GROUP. All the cases were observed for at least for 24 hours. Cases coming within 4 hours of a sting were given a dose of Prazosin (30 mic.gm/Kg/dose) and were observed. Those who came after 4 hours & were asymptomatic received only symptomatic treatment. Cases with signs of envenomation received Prazosin every 6 hourly till recovery. Cases having acute pulmonary edema (APE) were treated with dobutamine and sodium nitroprusside drip. Complicated cases were monitored in PICU as per the protocol. Complications associated with excessive parasympathetic and sympathetic stimulation were observed. Myocarditis was observed due to the toxin and excessive catecholamine, which complicated in left ventricular failure (LVF) and APE. Nearly half of the children with acute myocarditis developed APE. Death was mainly due to myocarditis and APE, with or without encephalopathy. Mortality was high in children who received steroid and antihistaminics outside and who came late (> 4 hours). Complication rate remained almost same in both the groups. There was a significant reduction in overall mortality (P = < 0.0155) and in deaths associated with APE (P = < 0.0001) after the protocol guided therapy. There was also a reduction in mortality in encephalopathy group though not statistically significant. This treatment protocol and aggressive management of APE reduced the mortality due to SS significantly.
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31
Original Article
Outcome of Scorpion Sting Envenomation After A
Protocol Guided Therapy
Niranjan Biswal, Rani A. Bashir, Uday C. Murmu, Betsy Mathai, J. Balachander
1
and
S. Srinivasan
Department of Pediatrics and Cardiology, JIPMER, Pondicherry.
ABSTRACT
Objective. Scorpion sting (SS) envenomation is a life threatening emergency in children, though not so severe in adults.
Attempt to develop protocol using prazosin and dobutamine and few other drugs to treat SS.
Methods. Children aged 0-13 years with a history of scorpion sting were studied. Clinical features, complications, drug therapy
and outcome of the cases for the period 1992-97(N=186) was collected by the authors and also from the medical records
department (RETROSPECTIVE GROUP). Cases treated during 1997-2000 (N=198) as per the protocol were recorded as
PROSPECTIVE GROUP. All the cases were observed for at least for 24 hours. Cases coming within 4 hours of a sting were
given a dose of Prazosin (30 mic.gm/Kg/dose) and were observed. Those who came after 4 hours & were asymptomatic
received only symptomatic treatment. Cases with signs of envenomation received Prazosin every 6 hourly till recovery. Cases
having acute pulmonary edema (APE) were treated with dobutamine and sodium nitroprusside drip. Complicated cases were
monitored in PICU as per the protocol.
Result. Complications associated with excessive parasympathetic and sympathetic stimulation were observed. Myocarditis was
observed due to the toxin and excessive catecholamine, which complicated in left ventricular failure (LVF) and APE. Nearly
half of the children with acute myocarditis developed APE. Death was mainly due to myocarditis and APE, with or without
encephalopathy. Mortality was high in children who received steroid and antihistaminics outside and who came late (>4 hours).
Conclusion. Complication rate remained almost same in both the groups . There was a significant reduction in overall mortality
(P=<0.0155) and in deaths associated with APE (P=<0.0001) after the protocol guided therapy. There was also a reduction
in mortality in encephalopathy group though not statistically significant. This treatment protocol and aggressive management
of APE reduced the mortality due to SS significantly. [Indian J Pediatr 2006; 73 (7) : 577-582]
E-mail : nbiswal@jipmer.edu.
Key words : Scorpion sting; Myocarditis; Acute pulmonary edema (APE); Prazosin; Dobutamine; Sodium nitro prusside (SNP)
Scorpion sting (SS) in children is a life threatening
emergency. Most of the children with severe
envenomation die due to the toxin, whereas it is a
relatively less serious condition in adults. After a sting the
venom enters the circulation very rapidly, with a tissue
distribution half life of 5-6 minutes and peak tissue
concentration is reached in 37 minutes. The excretion
half-life of scorpion toxin is approximately 30 minutes.
1
It
induces complications in almost all the organ systems.
Most of the cases receive various drugs before coming to
a referral centre and many of them in a critical condition.
Different regimens had been tried in the past like
steroid. Adrenaline, cocktail of drugs containing
Correspondence and Reprint requests : Dr. Niranjan Biswal,
Department of Pediatrics, Jipmer, Pondicherry. Pin-605006.
Fax : 0413-2272067
Morphine, Pethidine, phenergan(Promethazine), Avil
(Pheniramine maleate), Largactil., Lasix (frusemide) and
insulin with glucose, large boluses of fluid therapy and
many other drugs, Most of the deaths due to scorpion
sting are attributed to cardiopulmonary complications
like myocarditis and acute pulmonary edema (APE).
2,3,4
Though the antivenin is available, it is species
specific and works only when it is given immediately
after the sting
5,6
Its efficacy is doubtful in the present
situation when cases come late and long after the toxin
s
peak tissue concentration time. In the absence of a
consensus on management and non availability of
antivenin as a routine drug in the hospitals, it is necessary
to evolve an alternate strategy to treat this condition.
Prazosin, a post synaptic alpha-1 blocker has the
pharmacological properties that counteracts the effects of
excessive catecholamine and helps in reducing
pulmonary congestion. It had been found to be an
Indian Journal of Pediatrics, Volume 73—July, 2006 577
32
Niranjan Biswal
et al
effective drug for SS in some studies involving adults.
7,8
The present study attempts to develop a protocol using
prazosin and dobutamine and few other drugs to treat SS
envenomation in children.
MATERIALS AND METHODS
This study was conducted at a tertiary care hospital
(JIPMER, PONDICHERRY) during Sep, 1997 to Dec, 2000.
All the cases (0-13 years) presenting to pediatric services
with a history of scorpion sting were either observed or
admitted to the pediatric intensive care unit (PICU). They
were classified into different groups (I-VII)depending on
the complications and symptoms.
Group I PCF
GROUP II PCF + APE
GROUP III PCF + MYOCARDITIS
GROUP IV PCF + APE + MYOCARDITIS
GROUP V PCF + APE+MYOCARDITIS +
ENCEPHALOPATHY
GROUP VI ENCEPHALOPATHY
GROUP VII NO COMPL ICATIONS
Myocarditis was diagnosed on the basis of clinical
features i.e tachycardia, arrhythmia, gallop rhythm,
systolic murmurs, ECG changes, elevated LDH (lactate
dehydrogenase) and echocardiography. APE pulmonary
was diagnosed on the basis of suggestive clinical features
like tachypnoea, pinkish, frothy sputum impaired
percussion note over lung fields, crepitations and
radiological findings, complemented with decreased
oxygen saturation with increased AaDo2. All of them
Protocol For Management Of Scorpion Sting
received a dose of prazosin (30 microgram per Kg body
weight) in supine position with monitoring of blood
pressure (BP), heart rate (HR), respiration rate (RR) and
hydration status. Cases showing signs of neurological,
cardiovascular (CVS), or pulmonary complications were
transferred to PICU .for monitoring and further
management. Subsequent management was based on the
development of complications and assignment to a
particular group in protocol. Children with persistent
irritability or altered sensorium, convulsions, neurologic
deficit were classified as cases of encephalopathy. In the
PICU children were monitored for oxygen saturation, HR,
RR, BP and urine output
Cases with a history of SS who came within 4 hr, were
given paracetamol for pain and a dose of Prazosin (30
microgram per Kg) tablet and were given 6 hourly till all
the symptoms subsided. Asymptomatic cases that came
after 4 hrs of SS, were kept under observation without
prazosin.
All the symptomatic cases were given Prazosin and
supportive care. Central venous pressure (CVP) was
monitored in addition to routine monitoring in ICU in
children who required sodium nitroprusside drip (SNP).
Children with APE were put on SNP drip and
dobutamine along with supportive measures and
ventilated when required. They were tapered off the SNP
drip after they got stabilized hemodynamically and were
given prazosin in intermediate care room. Dobutamine
was tapered and stopped after withdrawing prazosin.
This protocol was passed by the institute research
committee. Informed consent was taken from the parents
before starting the treatment as per the protocol.
(Prospective group) All the cases were observed for a
minimum period of 24 hrs. Cases with complications
were discharged after they were off the drugs for 12 hrs
(Prazosin and dobutamine) and were stable for 24 hrs.
Data regarding the cases for the previous years June,
Clinical Features Treatment
H/O scorpion sting *Paracetamol 15 mg/Kg &
Local pain ± wwelling *< 4 Hrs = Prazosin 30 mic gm/Kg
No systemic signs *>/=4hrs = No prazosin
*Observation for 24 hrs
Sweating, vomiting, cold extremity, *Prazosin. 6 hrly and maintenance
BP Normal or High (PCF) *I.V. Fluids, +/- oral rehydration solution
PCF + APE + Myocarditis **SNP drip 0.3-8 mic. gm/Kg/min
Low BP, Apical murmur, Gallop rhythm, Hemoptysis +/- CCF *Stop prazosin & restart- 30 min before stopping SNP
*Dobutamine 5-15 mic gm/Kg/min
*Dopamine 3-5 mic gm/Kg/min
*Lasix 1 mg/Kg slowly & after stabilisation of B.P.
*Ranitidine
*2/3
rd
of Maintenance - I.V. Fluids & I.C.U. care
Encephalopathy *I.V fluids (normal maintenance)
*Prazosin 6 hrly
*Gadenal and diazepam for seizures
*Ranitidine
Indian Journal of Pediatrics, Volume 73—July, 2006 578
33
Outcome of Scorpion Sting Envenomation After a Protocol Guided Therapy
1992-Aug, 1997 was collected by the authors at the time of
discharge and in few cases from the medical record
division of the hospital (Retrospective group). Analysis
was done in relation to complications, time interval
between the sting and the admission, body weight and
mortality. Fisher's exact test was used to compare the
outcome between the prospective and the retrospective
group. P value of < 0.05 was taken as statistically
significant.
RESULTS
384 children with scorpion sting (SS) were studied over a
period of 9 years. (1992-2000) in this hospital. 186 children
in retrospective group (1992-1997) were treated with a
cocktail of drugs like pethidine, largactil, promethazine
(Lytic cocktail), Avil. (pheniramine maleate) morphine,
decadron (dexamethasone). Lasix (frusemide) and
digoxin was given for myocarditis and APE. Multiple
boluses of normal saline or Ringer’s lactate were
administered for PCF. 198 children with SS were admitted
during 1997-2000. Out of them 56.4% were males and
43.6% females. Most of the cases (85%) were within 1-10
years. More number of boys had scorpion sting in 1–5 yrs
of age group, though an overall both the sexes were
equally affected. 17% of them had no symptoms or
complications. The youngest child who survived was a 37
days old infant with APE. Children who came late were
having features of excessive sympathetic activity
(tachycardia, intense vasoconstriction and carditis). Few
children presenting immediately after the sting (within 20
minutes) had features of parasympathetic hyperactivity
(i.e. sweating, salivation, bronchospasm and vomiting)–
(CHOLINERGIC ACTIVITY). But, none of these children
had bradycardia. All of them responded to therapy
satisfactorily within 30 minutes. 80 of the cases presented
with pain at the site of the sting. 2 children who had no
pain at admission developed pain after 8 hours with had
myocarditis with APE.
Tachycardia in the study cases lasted for 3 to 96 hrs,
whereas bradycardia improved withinin 6 hrs. Nearly
70% of cases had sinus tachycardia. Ventricular ectopics
with tachycardia was noted in some of the fatal cases.
Only 2 out of 6 having sinus bradycardia had APE.
Priapism was noted in nearly 50% of boys, nearly three
fourth had tachycardia and one fourth had hypertension.
Priapism subsided within 8 hrs in all the children except
in two, where it lasted for 24 hrs.
All the children (n=10) weighing 5 Kg or less had
complications; but without any mortality. Its incidence
reduced to 79-86% (n=178) in 6-25 Kg group and only 50%
(n=10) in more than 25 Kg group. 3 cases died in 21-25 Kg
group and 2 cases each in 11-15Kg and 6-10 Kg group. A
37-days-old child was the youngest victim in this study
who survived APE.
Most of the children had come with cold extremities,
sweating and vomiting.12.6% of the children had
hypertension (>95
th
percentile for age) and only 3% had
hypotension (<5
th
percentile) (Table 1). Nearly half of the
cases had neither local pain, sting marks, edema nor
echymosis as evidence of SS. 2 children developed local
pain at sting site, myocarditis and APE after 8 hours of
admission. Their clinical features and associated
complications are outlined (Table 1).
TABLE 1. Clinical Features of the Cases (1992-2000)
Signs /Symptoms 1997-2000
N=198 (%)
Local pain 97 (48.9)
Local reaction 10 (5)
Vomiting 95 (48)
Sweating 117 (59)
Salivation 60 (30.3)
Cold periphery 150 (75.75)
Abdominal pain 7 (3.5)
Altered behavior 55 (27.7)
Tonic posturing 6 (3)
Seizures 6 (3)
PCF 144 (72.7)
Priapism 51 (25.75)
Dilated pupil 6 (3)
Constricted pupil 24 (12)
Tachycardia 131 (67)
Bradycardia 7 (3.5)
Hypertension 25 (12.6)
Hypotension 6 (3)
Tachypnoea 53 (26.7)
Crepitations 32 (60)
S3 60 (30)
APE 59 (30)
Apical murmur(MR) 5 (2.5)
Myocarditis 86 (43)
All the cases with hypertension responded within 4
hours but hypotension took longer and variable period for
recovery 6-44 hrs. Children developed myocarditis and
hypotension under observation even after 12-16 hrs of the
sting and took upto 18 hrs for recovery. Myocarditis was
detected in 20% of cases clinically but could be diagnosed
in 43% of cases after other investigations. 69% of the cases
with PCF showed resolution in 8 hours with warm
periphery. Only one child with myocarditis and PCF took
36 hr for recovery. 78% of cases with priapism recovered
in 8 hours but it lasted upto 24 hr in 2 cases. 16 cases were
seen with APE without clinical or ECG evidence of
myocarditis and 8 of them had echocardiographic
evidence of myocarditis. All but 3 cases with tachypnoea
had APE.
Fresh crepitations appeared in the lungs even after 36
hrs of admission. S3 gallop rhythm appeared even after 41
hrs of admission and lasted for upto 72 hrs. Systolic
murmur at the apex disappeared in 4 hrs in all the cases.
Only in one child with APE with myocarditis the systolic
murmur appeared after 12 hrs of admission and lasted for
24 hrs. Rare features observed were generalized body
weakness with hypotonia, hyperthermia, shivering, extra
Indian Journal of Pediatrics, Volume 73—July, 2006 579
34
Niranjan Biswal
et al
pyramidal symptoms, giddiness, dysarthria and coma.
All the children with encephalopathy presented with
signs and symptoms of encephalopathy at the time of
admission 54.5% of the cases without any complications
had come to the hospital within 1 hr of the sting and only
2 cases had APE within 1-4 hr of the sting. More than 80%
of cases with APE, Myocarditis and Encephalopathy
presented to us after 4 hrs of the sting. All the fatal cases
were seen after 4 hr of the sting (Table 2)
67% of cases did not receive any treatment from
outside and 76.69% of them had complications. Out of 164
complicated cases, 44 had received avil (pheniramine
maleate), decadron (dexamethasone) and 53% of them
developed myocarditis with APE, and 2 cases developed
encephalopathy. These two drugs given along with
prazosin also had higher incidence of complications.
Children admitted within 1 hr of sting had much less
complications than of those who came later. Children
admitted after 4 hrs of scorpion sting had significantly
higher incidence of complications and mortality than of
those who came earlier, (P= 0.0011, 95% C.I=0.5858-
0.6998). Out of the 4 cases with multiple stings, only one
had developed APE. 9 cases had late onset APE even after
1- 24 hrs of admission.
Incidence of complications remained almost same in
both the groups except a slight increase in incidence of
APE cases in the prospective group. The mortality rate
reduced significantly in the prospective group (Table 3).
There were 20 deaths recorded in the retrospective group
out of 186 admissions, whereas only 7 deaths occurred
after the protocol guided therapy. (P=<0.0155, 95%
CI=1.196-1.956). Two children died immediately coming
to the casualty during 1997–2000 before receiving the
management as per the protocol. Therefore, these were
not considered as deaths in the prospective group for
analysis. One of them had come with persistent seizures
in coma and had a cardiac arrest and died immediately.
The other child had severe APE at presentation with pink
frothy sputum and circulatory collapse and had a cardiac
arrest on arrival at the casualty. He could not be
resuscitated.
There was a significant reduction in mortality
associated with APE in the prospective group. 16 out of 20
cases with APE died during 1992-96, whereas 5 out of 59
cases with APE expired after receiving the management
according to the protocol.(P=<0.0001,95% C.I=1.923-4.710)
(Table 3).
TABLE 3. Comparasion of Outcome of Cases in Both the Groups
1992-Aug, 1997 Sept, 1997-2000
N=186 Total cases (n=384) N=198
N=167 (89.8%) Complications N=164 (82.8%)
N=28 (14.14%) Myocarditis N=86 (43.4%)
N=20 (10.7%) Death N=7 (4%)
N=20 (10.7%)16* Ape N=59 (29.8%) 5*
N=6 (3.2%) 4* Encephalopathy N=8 (3.5%) 2*
*Indicates Death.
Ape (P=<0.0001)
Mortality (P=<0.0155)
4 out of 6 cases with encephalopathy expired in the
retrospective group, where as only 2 out of 8 cases with
encephalopathy died in the prospective group. There was
clinically a perceptible reduction in mortality in this
group, though it was not statistically significant (P=0.628).
Children who received steroid and antihistaminics had
a significantly higher mortality than the cases who did
not receive any treatment (P= 0.0012, 95% C.I=0.1924-
0.3212). Even those who received prazosin along with
steroid and antihistaminics had a significantly higher
mortality.(P=0.0135,95% C.I =0.0675-0.1756) than those
who did not receive any drugs before admission (Table 2).
132 cases were treated with prazosin alone and there
was no death. All the 20 cases treated with prazosin
survived. 5 of the 59 cases treated with SNP, prazosin and
dobutamine had expired. Interestingly analysis of these
cases {(1). prazosin alone, (2.) prazosin + dobutamine and
(3). SNP + prazosin+dobutamine)}, revealed that the first
group had significantly lower mortality than the third
group. (P=0.003).
Only one child developed hypotension after the first
dose of prazosin and was resuscitated with normal saline
and had no other complication afterwards. He had come
in less than 4 hr after the sting and was not given any
further dose of prazosin. No serious side effect was
TABLE 2. Outcome in Relation to Time Interval & Treatment Outside. (1997-2000)
I II III IV V VI VII TOTAL
Interval Between Sting <1HR 17 1 5 3 1 1 14 42
and Admission 1-4HR 30 3 24 9 1 0 13 80
>4HR 20 4** 9 29*** 6* 1* 7 76
Treatment Received (a) Avil & Steroids 12 2** 5 19*** 2 1 3 44
Outside (b) Prazosin 0 0 1 3 1 0 0 5
(c) Both 6 0 2 3 4* 1* 0 16
(d) None 49 6 30 16 1 0 31 133
* indicates death
4 hours or less vs >4 hours (p=0.0011)
(c) vs (d) ---- (P=0.0135)
(a) vs ( d) — (p=0.0012)
Indian Journal of Pediatrics, Volume 73—July, 2006 580
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Outcome of Scorpion Sting Envenomation After a Protocol Guided Therapy
documented in any of the cases who received SNP.
On follow-up of 60 cases for a period of 6 months to 2
yr, 2 children (aged 2 yr and 4 yr) had myocardial
dyskinesia and dilatation of cardiac chambers and
reduction of ejection fraction even after 1 year of SS. A 6
year old child continued to have mitral regurgitation
without myocardial involvement or stenosis of mitral
valve even after 24 months of followup and had no
definite history suggestive of rheumatic fever or previous
viral myocarditis. Many of the cases did not come for
follow-up despite repeated postal reminders.
DISCUSSION
Reduction in intensity of local pain at the site of the sting
on development of PCF and reappearance of pain when
the periphery became warm indicates restoration of
circulation after a phase of intense vasoconstriction,
excessive catecholamine activity. Autonomic storm after
scorpion sting had been reported by others also.
8, 9,10
Life
threatening complications (APE, Myocarditis,
Encephalopathy) were common in <5 Kg group similar to
another study.
10
However, the mortality rate was more in
> 25 Kg group contrary to another study.
8
PCF cases with cold extremities were seen in 73% of
cases, similar to 86.3% reported in literature.
8
This is
probably the early stage of compensated shock due to
excessive catecholamine resulting in peripheral
vasoconstriction, but with out significant myocardial
dysfunction. Though profuse sweating was observed only
in 59% of our cases (including some fatal cases also), it
was found in 97 % of cases and was conspicuously absent
in fatal cases in another study.
2
Nearly half of the cases with myocarditis had APE &
many had S3 gallop and apical murmur of mitral
regurgitation similar to tachyarrhythmia myocarditis in 3-
75% of cases and apical murmur in 43.9% of cases in other
studies.
2, 11, 12, 13
Late onset APE could have been due to acute
myocardial injury and LVF caused by the toxin and the
toxin induced autonomic storm. This had been reported in
17%–34.8% cases from Saudi Arabia (SA) and India.
12,8
3
of the present cases had neither acidosis nor other
identifiable cause for tachypnoea similar to 3% of cases
reported from Saudi Arabia and could be due to toxin
induced central hyperventilation.
12
Generalized seizures and tonic posturing was seen in
3% of cases in comparison to 2-13% from India, Israel and
SA. Irritability, excessive sleepiness, excessive crying to
minimal stimulation (i.e. calling by name or gentle caress
by the mother) was found in 28% of present cases whereas
it had been reported in 42% of cases with a very high
incidence of encephalopathy (21.3%) from SA.
12
Time lapsed between the sting and the admission is
probably a key factor for better outcome. Children
admitted within 4 hr of the sting had much less
complications than those came later (P=0.0011).Most of
the cases with APE, encephalopathy and myocarditis
came to us after 4 hr of the sting and had higher mortality
and morbidity. However some studies from India and
Saudi Arabia had observed that most of the fatal cases got
admitted after 30 minutes to 3 hr of sting
2, 8, 12
we believe
that early hospitalization and Prazosin therapy might
have prevented complications and mortality. Usefulness
of Prazosin in preventing cardiopulmonary complications
had been described in adults.
8
Most of the cases who received multiple drugs outside
before coming to the emergency had complications.
Children who received decadron (dexamethasone) and
anti-histaminic (avil) in spite of receiving prazosin had
higher mortality and complications in comparison to
those who did not receive any drug (P=0.0135).There was
also significant statistical difference between the groups
receiving antihistamines and dexamethasone to no
treatment group (p=0.00012) and 4 out of 5 deaths
occurred in this group. Antihistaminics and
dexamethasone alone or in combination are known to
potentiate the effect of catecholamine in CVS and CNS
and worsen encephalopathy.
10
Those who received
multiple drugs also wasted valuable time and came late
with complications in different systems.
Significant reduction in mortality (P=<0.001) was the
key observation in the present study, similar to few
reports from adult studies.
10, 14
Mortality was far less
(p=0.003) in cases treated with prazosin alone in
comparison to others who received either dobutamine,
dopamine or SNP along with prazosin. This could be due
to the protective effect of prazosin on cardiovascular and
respiratory system. This effect was probably not so much
after the onset complications. Though SS had been
suggested to be a contributing factor for cardiomyopathy
in later life, in the present study only 2 cases had
persistent cardiac dysfunction and only one had mitral
regurgitation following the SS.
15
It is difficult to draw any
conclusion from this.
Reduction in mortality associated with encephalopathy
68% to 26% could be due to the usefulness of Prazosin in
neutralizing the adverse effect of catecholamine released
in the brain, as the catecholamine released outside the
brain doesn’t cross the blood brain barrier. Cerebral
infarctions in different areas had been reported on C.T
scan after the scorpion sting.
16
CONCLUSION
In a year 30-50 children with SS are admitted in this
hospital and most of them come with systemic
complications. Delayed hospitalization was associated
with severe life threatening complications. Treatment
with steroid, antihistaminic and sympathomimetic drugs
before admission was associated with poor outcome.
Presence of PCF alone without cardiopulmonary
Indian Journal of Pediatrics, Volume 73—July, 2006 581
36
Niranjan Biswal
et al
compromise carried excellent prognosis with 100%
recovery with treatment. Excellent result was achieved in
cases with APE following the above protocol in children.
Encephalopathy with or without other complications
resulted in higher mortality.
Early medical attention, avoiding conventionally used
harmful drugs like steroid antihistaminic and other
cocktails of sedatives may reduce the complications and
mortality. Many children did not come for follow-up
despite repeated postal reminders and might have been
asymptomatic after discharge. A long term prospective
study may answer the issue of long term complications
following a sting.
Acknowledgement
We are thankful to Dr. H.S. Bawasker, M.D. Physician and Dr M.S.
Ranjit, M.D. Ped. Cardiologist for their suggestions and guidance
during designing of the protocol.
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P, Raju B. Cardiovascular manifestations of scorpion sting in
children. Indian Pediatr 1977; 15 : 353-356.
14. Bawasker HS and Bawasker PH. Severe envenoming by Indian
Red Scorpion (B tamulus). The use of Prazosin therapy. Q J
Med 1996; 89 : 701-704.
15. Sunder Raman T, Olithiselvan M, Sethuraman KR, Narayan
KA. Scorpion envenomation as a risk factor for development
of cardiomyopathy. J Assoc Phys India 1999; 47(11) : 1047-1057.
16. Thaker AK, Lal R, Mishra M. Scorpion bite with multiple
cerebral infarcts. Neurol India 2002; 50 : 100-102.
Indian Journal of Pediatrics, Volume 73—July, 2006 582
37
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... Those children who received treatment after 6 hours of being stung are at high risk of complication and death. [4,5] There is a paucity of epidemiological data on scorpion stings mainly because of the reduced severity of scorpion envenomations among adults and poor organization of health services. Apart from this, many patients resort to traditional medicines to treat scorpion stings. ...
... [3,5,6] A higher mortality rate in some studies is mainly due to late presentation (beyond 6 hours of sting) of cases to the hospital for treatment. [4][5][6] A higher mortality is also observed among children who received steroids and anti-histamines. [4][5][6] Mahadevan et al. [9] is of opinion that deaths in children are mostly due to irrational therapy or failure to monitor closely and effectively treat pulmonary edema. ...
... [4][5][6] A higher mortality is also observed among children who received steroids and anti-histamines. [4][5][6] Mahadevan et al. [9] is of opinion that deaths in children are mostly due to irrational therapy or failure to monitor closely and effectively treat pulmonary edema. In reality, because children have a healthy myocardium, they should recover fast and tolerate the autonomic storm of venom well if they receive timely and effective treatment. ...
Article
Full-text available
Introduction: Scorpion envenomation is a life-threatening condition, particularly for children. Therefore, it is essential for primary care health providers to suspect, identify, and manage this condition early to prevent death and minimize morbidity. Objective: To identify the key epidemiological characteristics of scorpion envenomation and update the primary care health workers regarding the latest management practices of scorpion envenomation. Methodology: A non-systematic review was performed by searching the key terms on databases such as PubMed, Medline, Scopus, Google Scholar, and ResearchGate. Results: Worldwide, over 2.5 billion people are living at risk of scorpion stings. Every year, over 1.2 million are stung by scorpions leading to the death of at least 3,250 people globally. The most vulnerable group includes farmers, laborers, and those living in rural areas. Adults are most frequently stung but envenomation is more severe among children. Prazosin is a key drug to prevent death due to cardiovascular complications. Conclusion: Most of these stings and deaths could be preventable with proper awareness, safety precautions, and timely access to treatment. Government and local hospitals should ensure the availability of key drugs such as prazosin.
... Clinical symptoms in scorpion stings can vary from mild to severe, and the most common findings include restlessness, cold extremities, tachycardia, and hypotension [3,16]. Scorpions can sting when they are accidentally contacted or feel in danger. ...
... Furthermore, the arms and legs were the most affected areas of the body (86.1%). These results are similar to previous studies in the literature [16][17][18] Depending on the effect of toxins, abnormal hematological values (leukocytosis, thrombocytopenia), renal (increased urea and creatinine), liver [increased ALT and aspartate aminotransferase (AST)], cardiac (tachycardia, bradycardia, ST-T changes), and pulmonary involvement can be seen [3,6]. In our study, when the control blood values of the patients were compared during admission and discharge, glucose, urea, creatine, total protein, ALT, Na (sodium), K (potassium), WBC, RBC, hemoglobin, hematocrit, and neutrophil values were found to be significantly higher. ...
Article
Full-text available
Introduction Scorpion sting in children is still a serious health problem today. Children are at greater risk of developing severe cardiac, respiratory, and neurological complications because of their low body weight. In this study, we retrospectively evaluated the demographical changes, complaints, clinical findings, and laboratory results of scorpion sting cases admitted to the pediatric emergency department. Materials and Methods The records of 72 patients who were followed up with the diagnosis of scorpion sting in the Dicle University Pediatric Emergency Department between 2013 and 2017 were retrospectively analyzed. Results The patients included in the study were between one and 15 years (7.64±4.04 years) and 43.1% were male, and 56.9% were female. While 65.3% of the cases lived in rural areas, 34.7% lived in the city center. The most common stung areas in the cases were the lower extremity (51.4%) and the upper extremity (34.7%). The most common complaints in the patients were 70.8% pain, 58.3% edema, 41.7% cold extremities, 23.6% sweating, 22.2% vomiting, and 12.5% excessive salivation. Of the cases, 71.4% had mild, 25.7% had moderate, and 2.9% had severe stages. Of the patients, 91.6% were given antivenom, 75.7% were given antihistamines, 74.3% were given steroids, 65.7% were given antibiotics, 64.3% were given analgesics, 44.3% were given tetanus vaccine, 2.8% were given erythrocyte suspension and 1.4% were given platelet suspension. In addition, 11.4% of the cases were given prazosin treatment. While 32.9% of the cases required intensive care, two patients died. A statistically significant difference was found between the glucose, urea, creatine, total protein, sodium, potassium, alanine aminotransferase, white blood cell count, red blood cell count, hemoglobin, hematocrit, neutrophil count values of the patients at admission and discharge. Conclusion Scorpion sting cases are still a significant health problem. The severe clinical course is more common in children. The management of patients with severe clinical forms is based on early recognition of the sting, antivenom serum administration, and cardiorespiratory and systemic support.
... J Evid Based Med Healthc., pISSN -2349-2562, eISSN -2349-2570 / Vol. 7 / Issue 34 / Aug. 24,2020 Page 1815 ...
... 23 Akin to our outcome, the mortality was highest in the Class 3, suggesting higher mortality in severe envenomation. Studies on paediatric population have demonstrated case fatality rates between 4-10.7 %. 24,25 Prazosin being an alpha adrenoceptor antagonist acts as a physiological and pharmacological antidote of scorpion venom. 26,27 In the initial phase of autonomic storm characterized by sustained stimulation of alfa-receptors, it plays an important role. ...
... Nearly half of the children with acute myocarditis developed APE. 14 Most of the cases recovered (98%), and only 2% of cases died due to scorpion sting. The mortality and morbidity has significantly reduced after the invent of prazosin. ...
Article
Full-text available
Scorpion sting is an acute time limiting medical emergency commonly encountered in rural villages of the country. It is a major public health problem in many tropical and sub tropical countries. India is most affected country in Asian epidemiological data. This study was done to study the complications and outcome of scorpion sting in children. This is a prospective observational study. a total of 100 cases of scorpion sting selected from the patients admitted to Vijayanagar Institute of Medical Sciences, Ballari. The demographical features, clinical presentation, complications, outcome and the response to standard treatment protocol were observed and analysed. Scorpion sting is a common and major health problem in our area. Most commonly affected age group was 4-6 years (27%), and male children (67%) were most commonly affected. These cases were most commonly seen during March (15%) to May (14%) months. Pain at the site of sting (99%) and excessive sweating (92%) were most common presenting complaints, cold extremities (88%), tachycardia (84%), and restlessness (72%) were most common signs noted. Most common complication was myocarditis (15%), followed by pulmonary edema (7%) and encephalopathy (2%). About 98% of cases recovered without sequelae and 2% of cases died due to complications. Scorpion sting is a serious, potentially fatal emergency in our area. Cardiovascular manifestations are most common and are life threatening complication. Administration of prazosin as early as possible is the single most effective intervention to prevent complications and mortality
... Nitroglycerin, a vasodilator that decreases preload and afterload, has been suggested for treating pulmonary edema [19]. Prazosin is also used for the treatment of cardiovascular complications of scorpion envenomation [117][118][119]. Prazosin decreases preload and afterload, decreases the sympathetic outflow of the central nervous system, and promotes insulin secretion, hence antagonizing the scorpion venom's hemodynamic and metabolic effects [118]. ...
Article
Full-text available
Background Scorpion envenomation is associated with several complications. One of the most serious complications is the cardiac involvement in the form of myocarditis that remains the main reason for mortalities associated with scorpion envenomation. The present review aims to elucidate clinical and paraclinical findings associated with scorpion-related myocarditis, and to explore different management strategies and subsequent outcomes.Methods We searched PubMed, Web of Science, Scopus, and Google Scholar for articles related to keywords of myocarditis associated with scorpion envenomation up to May 1, 2022. Each article was carefully reviewed by two independent researchers. In case of disagreement for inclusion, we sought a third researcher opinion.ResultsA total of 703 cases from 30 case reports and 34 case series were included in our review. Myocarditis associated with scorpion envenomation was usually reported in children presenting with cardiopulmonary symptoms including pulmonary edema (60.7%) and shock or hypotension (45.8%). The most common ECG findings are sinus tachycardia (82%) followed by ST-T changes (64.6%). The management typically included inotropes (especially dobutamine), prazosin, diuretics, nitroglycerine and digoxin, when indicated. Mechanical ventilation was required in 36.7% of the patients. Mortality in confirmed scorpion-related myocarditis cases is estimated at 7.3%. Almost all survived cases showed rapid recovery and improvement in the left ventricular function.Conclusion Even though myocarditis associated with scorpion envenomation is rare, it remains a serious and in some of cases a fatal consequence of scorpion sting. In case of relative presentations, particularly in envenomed children, diagnosis of myocarditis should be considered. Early screening using serial cardiac markers and echocardiography can guide the treatment. Prompt treatment that focuses on cardiogenic shock and pulmonary edema usually results in a favorable outcome.
... All patients had hyperglycemia. Cold extremities were reported in majority of patients in studies by Bawasker et al. and Biswal et al. [5] Two cases died, both due to complication of pulmonary edema. Case fatality rate in this study was 3.27%. ...
Article
Full-text available
Introduction: Venomous scorpion sting is a medical emergency. The clinical manifestations vary widely between the children and adult group. Aims: The aims of the study were to study the profile of scorpion sting in children admitted in the pediatric intensive care unit (PICU). Materials and Methods: Sixty‑one cases of scorpion sting admitted in PICU of MGM Medical College were studied. A detailed history was taken, and a thorough clinical examination was done in all patients. All patients with cold extremities, sweating, and tachycardia were given prazosin. Patients with features of shock were treated with oral prazosin plus dobutamine. Patients with features of shock and myocarditis were treated with prazosin plus dobutamine plus antiscorpion venom therapy. Results: Of 61 cases enrolled in our study, scorpion sting was more common in monsoon followed by summer season. The sting was more prevalent in the lower limb. The most common symptom was pain followed by cold extremities. Dyspnea due to pulmonary edema and bradycardia were less common. Tachycardia was frequently noted (80%). Two patients presented after 12 h had developed pulmonary edema and died. Conclusion: Prazosin had good outcomes in all patients with scorpion sting when administered at the time of admission. The study throws light on the common clinical features and complications of scorpion sting
... 33 Children from lower socio-economic status were found to be affected more .Similar observations were also made by Bawaskar et al and Biswal et al which could be due to living conditions of these children and also noticed that more cases (53.57%) were encountered during evening time. 34,35 This observation was consistent with those made by Bawaskar et al and Abdulaziz et al. which is due to nocturnal nature of scorpions. 34,36 The venom may cause hepatotoxicity and hematological derangements which is the result of stimulation of chemical mediators (neurotransmitters, catacholamines) and release of cytokines, inflammatory mediators implicated in organ involment. ...
Article
Full-text available
Background: Aim was to study clinical, socio- demographic and laboratory profile and outcome in children with scorpion envenomation up to 12 years of age. This study conducted to provide better insights in to the socio-demographic, clinical, laboratory profile of scorpion envenomation in rural health setting in India.Methods: This was a hospital based, prospective observational study done in children up to 12 years of age admitted in a tertiary care centre between March 2018 to April 2020 with history of scorpion envenomation, presence of sting mark or scorpion seen in vicinity of child by parents or near family members. Unknown bites or stings and cases were the clinical manifestations are not compatible with scorpion sting were excluded.Results: During the study period, 28 children were admitted for scorpion sting. Maximum number of cases were noted in the age group of 3-6 years and there is equal distribution of cases among males and females .Majority of cases from rural areas, 46.42% of the cases had black scorpion sting, most of the stings occurred during evening time and spring season. The most common sting sites were the distal part of the extremities. Pain at the sting site and local swelling were the most common presenting symptoms. The common signs noted were tachycardia. The most common ECG changes were noted in the present study was sinus tachycardia (46.42%) fallowed by ST segment changes noted in 21.4% of children. Commonest complications noted myocarditis, pulmonary edema, myocardial dysfunction, peripheral circulatory failure. One patient died due to pulmonary edema. Majority of the cases recovered without any sequale.Conclusions: Scorpion envenomation is a preventable emergency among children and closely associated with environmental condition, socioeconomic status and child activities. Supervised outdoor play, early hospitalization, close monitoring of vitals and management of complications and supportive care may reduce the mortality and morbidity.
... During the period of study, 64 cases needed ICU admission due to neurological, cardiac, respiratory or gastrointestinal complications while 28 cases of them showed manifestations of myocarditis. On ECG, sinus tachycardia was the commonest finding followed by other less common ECG changes and these were supported by previous studies reporting abnormal ECG findings in 56-99% of scorpion envenomed children [22][23][24]. On follow-up after start of treatment, ECG changes resolved in most cases at the end of first week simulating previous studies [18,22,25]. ...
Article
Background: Scorpion envenomation is a major public health problem in children that can induce lethal neurological, respiratory and cardiovascular complications. We aimed to evaluate cardiovascular complications with a follow-up of envenomed children for 1 month for possibility of incomplete recovery. Methods: This was a prospective study conducted for children who presented with scorpion sting to Emergency and Intensive Care units. Demographic, clinical and laboratory findings of patients were recorded. Cases with suspected clinical and electrocardiographic manifestations of myocarditis were subjected to bedside echocardiography with follow-up at the end of the first week and the first month. Results: Scorpion sting cases presented to our hospital were 81 cases during 1-year study; of them, 17 cases were stable without systemic manifestations after 12 h observation and discharged. Sixtyfour cases suffered systemic organic complications and needed ICU admission; their mean age was 11.5263.74 and 64% of them were males. Twenty-eight of admitted cases showed manifestations of myocarditis and by echocardiography, all of them had evidence of left ventricular dysfunction. On follow-up, there was significant improvement at the end of first week and complete improvement at the end of first month except three cases who died due to pulmonary edema and cardiogenic shock. Conclusion: Acute toxic myocarditis is a common and an important cause of morbidity and mortality following scorpion envenomation that necessitates early and aggressive management. High index of suspicion, serial electrocardiogram monitoring and echocardiography are three integrative lines required to recognize this serious complication.
Article
An antivenin for A. amoreuxi venom was prepared by hyperimmunizing rabbits. The globulin fraction was separated and purified and the immunogloblin fraction (chiefly IgG) separated, purified and radioiodinated. Using the immunodifussion technique, seven prominent and two faint precipitin bands were found with both the crude antivenin and the globulin fraction and four prominent and one faint precipitin bands with the immunoglobulin fraction, when tested against the venom. Ten milligrams of the immunoglobulin fraction (Ig) protected the mice from the lethal action of a dose of the venom equal to 5 times the ld50. The corresponding values for the globulin fraction and the crude antivenin were 70 mg and 4 ml, respectively. The pharmacokinetic profile of the labelled Ig was determined following rapid i.v. injection into rabbits. The data obtained showed an excellent fit to a triexponential equation of the form: Cp,t=Pe−πt+Ae−αt;+Be−βt; where Cp,t is the antivenin concentration in the blood at time t, π, α and β are hybrid rate constants and P, A and B are the corresponding zero time intercepts. This equation represents a pharmacokinetic model consisting of a central compartment from which distribution to a rapidly equilibrating “shallow” compartment and a slowly equilibrating “deep” compartment takes place, with elimination taking place from the central compartment. The apparent half-lives for the early declining phases were 1.06 and 9.63 hr for the rapidly and slowly equilibrating compartments, respectively. The overall elimination half life was 43.3 hr. The ineffectiveness of serotherapy with scorpion antiven injected several hours after scorpion sting might be due to differences in distribution half lives.
Article
Scorpion sting is a hazardous and potentially lethal condition. One hundred twenty-one scorpion sting patients were admitted to hospitals in Mahad Maharashtra state, India, during 1986–89. Sixty-six (54.5%) victims had hypertension (mean blood pressure 96 to 160 [average 118.6] mmHg). Twenty-four (19.5%) victims demonstrated tachycardia, with heart rates ranging from 110 to 215 (average 156) beats per minute. Twenty-two (18.8%) had pulmonary edema, while nine (8.5%) died. Analysis of our data suggests that cardiovascular morbidity and mortality depends upon the time between the stings and hospitalization or administration of vasodilators. Current management of scorpion envenomation consists of rapid reduction of hypertension with sublingual nifedipine, postsynaptic alpha adrenergic blockade with prazosin hydrochloride, and digoxin therapy for myocardial failure. Massive pulmonary edema can be treated with sodium nitroprusside. In our setting, mortality is reduced by early hospitalization, even though specific antivenin is not available in India.
Article
Prazosin (1-[4-amino-6, 7-dimethoxy-2-quinazoline]-4-[2-furoyl]-piperazine), the first of a new class of antihypertensive agents, was released for clinical use in the United States in 1976. Although it has been used effectively as a single agent, its widest application is in combination with other drugs in the therapy of patients with chronic hypertension. Preliminary data suggest that prazosin may also have a role in the therapy of severe congestive heart failure by effecting a reduction in cardiac pre-load and afterload.
Article
To elucidate the hemodynamic effects of prazosin, an antihypertensive agent, in congestive heart failure, we studied 10 patients with ischemic cardiomyopathy and severe ventricular dysfunction. After an oral dose of 2 to 7 mg, heart rate was unchanged (P greater than 0.05). One hour after prazosin administration, mean arterial pressure declined from 95 to 78 mm Hg (P less than 0.001); left ventricular filling pressure declined from 30 to 18 mm Hg (P less than 0.001), cardiac index increased from 2.1 to 2.9 liters per minutes per square meter (P less than 0.001), and systemic vascular resistance fell from 2074 to 1156 dynes sec cm-5 (P less than 0.001). In both forearms vascular resistance and venous tone were reduced (86 to 48 mm Hg per ml per 100 g per minute, and 59 to 18 mm Hg per ml, respectively [P less than 0.001]). All responses persisted for a least six hours (P less than 0.01). Prazosin benefits severe congestive heart failure by inducing a sustained fall of both cardiac preload and impedance.
Article
Cardiovascular manifestations of scorpion sting, though recognized, are not well documented in children. Since increased morbidity and mortality were observed in the presence of cardiovascular complications, a preliminary study of twenty children with scorpion sting was carried out with reference to clinical manifestations, ECG abnormalities and enzyme changes. Though clinical signs and symptoms were predominantly related to the peripheral failure, electrocardiographic evidence of myocarditis was observed in 15 cases, and myocardial injury pattern with associated enzyme changes, in two cases. There were no deaths in the children studied. The genesis of these complications is discussed in detail.
Article
Admissions for scorpion sting in 1 year and deaths resulting from scorpion sting over 3 years were analysed. Features that indicated the severity of the clinical condition were identified. Pulmonary oedema and shock were the usual causes of death. Poor management of fluid therapy was responsible for the frequently unsatisfactory resolution of envenoming, especially when purified human plasma was used. The role of the scorpion antivenom used is questioned and controversy regarding the most appropriate sedative to use in the management of scorpion sting is still not resolved. An in-depth study of these management issues is urgently required.
Article
Acute myocarditis was produced by injection of 4 mg/kg Indian red scorpion (Buthus tamulus) venom in dogs. Several rhythm changes, conduction defects, infarction-like pattern and many other ECG abnormalities; hyperglycemia, reduced insulin secretion, rise in free fatty acids along with fall in triglycerides; depletion of glycogen content of atria, ventricles, liver and skeletal muscles was noticed within 20-30 minutes after scorpion envenomation. Ten units of crystalline insulin was given i.v. at this time. All the arrhythmias, conduction defects and other ECG abnormalities disappeared after intervention with insulin. The sinus rhythm persisted for a duration of 120 minutes till the animals were sacrificed. Reduction in free fatty acids along with a rise in triglycerides; glycogenesis in liver, cardiac and skeletal muscles was observed at the time when ECG tracing was normal. It is suggested that catecholamines released during autonomic storm in scorpion poisoning suppress insulin secretion. These in turn result in glycogenolysis; lipolysis resulting in increased free fatty acids and produce arrhythmias. Insulin administration results in glycogenesis; lipogenesis and stops arrhythmias.
Article
More than 650 species of scorpion have been recognized throughout the world. Among these, only a limited number can inject poison from their sting located at the tail end. Contrary to symptoms in adults, where local reactions such as sharp burning and swelling predominate, children often present with anaphylactoid reactions following the initial local reaction and pain. Clinical manifestations observed in the nonfatal cases are as follows: peripheral failure, which presented as sweating, restlessness, cold and clammy extremities and hypotension, observed in all the cases; myocarditis; pulmonary edema. In seven fatal cases: peripheral failure in all the seven cases; myocarditis in one case; convulsions in one case; hyperpyrexia and convulsions in two cases; pulmonary edema and convulsions in one case. Lytic cocktail therapy was supplemented with steroids wherever indicated, along with other measures.
Article
Androctonus crassicauda venom has an i.v. LD50 in mice of 0.32 +/- 0.02 mg/kg, which makes the scorpion among the most toxic species in the world. Fifty-one non-fatal and one fatal cases of scorpion sting were presented. Pain and tenderness were very common following the sting. Generalized erythema occurred in 20-25% of all infants and children below the age of 5 years. Severe CNS manifestations including seizures, unconsciousness and marked irritability occurred mainly in infants and young children, while hypertension occurred in the majority of victims below the age of 11 years. Two pregnant victims were treated with antivenom with no bad consequences on mothers or foetuses. The fatal case described was inadequately treated with antivenom and presented a rare situation of intracranial coagulation in the basal cisterns or low in the cranial subarachnoid space. The victim developed moderate hydrocephalus of the communicating type with clear ventricular CSF and strongly xanthocromic fluid from lumbar puncture. The effects of A. crassicauda venom on isolated hearts, atria and anaesthetized rat blood pressure appeared to be mediated largely through stimulation of the autonomic nervous system with predominance of sympathetic stimulation and release of tissue catecholamines. Electrocardiograms recorded simultaneously with blood pressure changes showed evidence of ectopic foci during the hypertensive phase and ischaemia, inferior wall infarction and different degrees of heart block during the late hypotensive phase. Androctonus crassicauda venom was unique in following a three-compartment open model comprising a central compartment 'blood', a rapidly equilibrating 'shallow' tissue compartment and a slowly equilibrating 'deep' tissue compartment. The overall elimination half-life, t1/2 beta, was 24 hr, indicating that the venom has the slowest elimination among all known scorpion venoms. The long stay of the venom in the body might explain the increased risk of toxicity and the good potential for treatment with serotherapy even hours after the sting.