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Context 1
... pathogenesis is multi- faceted, including duct, stone, and genetic related. 8 The passage of a gallstone or sludge causes local edema or transient spasm of the ampulla of Vater (Fig 1), causing transient obstruction of the pancreatic duct, resulting in increased pancreatic secretion, pancreatic edema, and/or necrosis. 9 The risk is increased with small gallstones 5 mm, cystic duct diameter 5 mm, multiple gallstones (20), excess cholesterol crystals, and good gallbladder emptying. ...
Context 2
... pancreas, a retroperitoneal gland that is often quoted as an organ of mystery, has both endocrine and exocrine functions ( Fig 1). Approximately 80% of the gross weight of the pancreas supports exocrine function, while the remaining 20% is involved with endocrine function. 1 Enzymes are produced within the pancreatic acinar cells, packaged into storage vesicles called zymogens, and then released via the pancreatic ductal cells into the pancreatic duct, from where they are secreted into the small intestine to begin the metabolic process needed to affect the major digestive activity of the gastrointestinal tract. The pancreas secretes 1500-3000 mL of iso-osmotic alkaline (pH Ͼ 8.0) fluid per day containing many enzymes and zymogens. We searched MEDLINE using the keywords acute pancreatitis (AP) AND etiology, diagnosis, laboratories, imaging, clinical features, treatment, management, complications, and differential diagnosis. The infor- mation is synthesized from the review articles, guidelines from gastroenterology societies, and original articles (1974-2011). Following ingestion of food, the vagal nerves, vasoactive intestinal peptide, gastrin releasing peptide, secretin, cholecystokinin (CCK), and encephalins stimulate enzymatic release into the pancreatic duct. The pancreas secretes amylolytic, lipolytic, and proteolytic enzymes. Amylase, the major amylolytic enzyme, hydrolyzes starch to oligosaccharides. The lipolytic enzymes include lipase, phospholipase A, and cholesterol esterase. Proteolytic enzymes which include trypsin, chymotrypsin, carboxypeptidases, aminopeptidases, and elastases act on peptide bonds of proteins and polypeptides. The proteolytic enzymes are secreted as inactive precursors (zymogens). These precursor enzymes reach the duodenum where trypsinogen, the proenzyme for trypsin, is activated by the brush border enzyme enterokinase. Trypsin then facilitates the conversion of the other pro-enzymes to their active form. Autodigestion of the pancreas is prevented by the packaging of proteases in precursor form and by the synthesis of protease inhibitors, such as pancreatic secretory trypsin inhibitor and serine protease inhibitor (SPINK1). 2 In addition, the acidic pH and a low calcium concentration in the zymogen granules guard against premature activation of the proenzymes. Whenever there is a loss of any of these protective mechanisms, zymogen activation and autodigestion occur, leading to AP. Pancreatic enzyme secretion is controlled by a negative feedback mechanism induced by the presence of active unbound proteases in the duodenum. Pancreatic inflammatory disease may be classified as AP and chronic pancreatitis. The pathologic spectrum of AP varies from a mild self- limited form of interstitial pancreatitis to a severe systemic form of necrotizing pancreatitis. 3 AP is defined by the presence of 2 of the 3 criteria : 1. Abdominal pain characteristic of AP; 2. Serum amylase and/or lipase Ն 3 times the upper limit of normal; and 3. Characteristic findings of AP on computed tomography (CT) scan. In 1992, the Atlanta International Symposium classified AP into mild AP (edematous/interstitial pancreatitis), which has a mortality of 1%, and severe AP (necrotizing pancreatitis), which constitutes about 20% to 30% of the AP with a mortality rate around 20% to 30%. 5 Determining the etiology of AP is crucial in the management of an acute episode and in the prevention of recurrent pancreatitis. Biliary and alcoholic pancreatitis constitute the majority of cases. In up to 30% of cases, etiology cannot be determined and they are labeled as “Idiopathic pancreatitis.” The potential causes are outlined in Table 1. Biliary pancreatitis is the most common cause of AP in the western world, accounting for 35% to 60% of patients with AP. The incidence of biliary pancreatitis has been increasing over the past decade. A higher incidence of gallstone pancreatitis is noted in Hispanics, whites, women, and persons over the age of 75 years. 7 The significance of determining a biliary etiology is important as it needs invasive treatment, and failure to identify it can lead to recurrent pancreatitis. The pathogenesis is multi- faceted, including duct, stone, and genetic related. 8 The passage of a gallstone or sludge causes local edema or transient spasm of the ampulla of Vater (Fig 1), causing transient obstruction of the pancreatic duct, resulting in increased pancreatic secretion, pancreatic edema, and/or necrosis. 9 The risk is increased with small gallstones Ͻ 5 mm, cystic duct diameter Ͼ 5 mm, multiple gallstones ( Ͼ 20), excess cholesterol crystals, and good gallbladder emptying. 10 Common bile duct diameter Ͼ 13 mm and a wide angle between bile duct and pancreatic duct are known ductal risk factors for AP. 11 Duodenal exclusion of pancreatic juices has been postulated in the pathogenesis. 12 The lack of trypsin results in an increase in CCK- releasing peptide because it is inactivated by trypsin. As a result, there is an increased level of CCK, resulting in increased pancreatic secretion. 13 During ampullary obstruction, the pressure gradient between pancreatic duct and biliary duct disappears, resulting in a reflux of infected bile juice into the pancreatic duct, which triggers pancreatitis. Genetic defects have also been postulated in the etiology of AP, the most important being the SPINK1 mutation, which results in decreased production of trypsin inhibitor. 14 Other genetic causes for acute recurrent biliary pancreatitis include mutations in the ABCB4 and CFTR genes. Alcohol is considered the leading cause of AP in patients with a history of alcohol consumption. Heavy alcohol use is the second most common cause of AP in developed countries. Moderate drinkers are defined as having 4-14 drinks/week in men and 4-7 drinks/week in women. Heavy drinkers are defined as having more than 14 drinks/week in men and more than 7 drinks/week in women. Alcohol does not cause AP directly. There has to be a cofactor involved with alcohol in the causation of pancreatitis. The cofactors identified are smoking, African American race, and a high-fat, high-protein diet. 15 Likewise, only a small proportion of alcohol abusers develop pancreatitis. Alcohol decreases the threshold for trypsin activation, which leads to pancreatic injury and also alters the severity of pancreatic inflammation. There is no established threshold for the amount of alcohol that causes pancreatitis. Several studies have postulated that the consumption of more than 80-100 g/d of alcohol for 5 years is a threshold for causing pancreatitis. Papachristou et al. identified chronic alcohol consumption ( Ͼ 2 drinks/day) as a major risk factor for the development of pancreatic necrosis in AP. 16 The theory is that the alcohol exposure shifts the mechanism of cell death from apoptosis to necrosis. 17 Recent studies have demonstrated smoking as an important cause of both chronic and idiopathic pancreatitis. 18-20 It is an independent risk factor and the risk is dose dependent. 20 It also has an additive/synergistic effect, with alcohol in the progression of pancreatitis. 21 The role of oxidative stress in the induction of pancreatitis has been postulated in active smokers. 22 Genetic influence has also been shown to affect the complex alcohol–smoking interaction. 23 The gastroenterology commu- nity continues to raise awareness of smoking as a risk factor for pancreatitis. 19 The 1991 consensus definition for Post-ERCP Pancreatitis (PEP) is “new onset of pancreatic type abdominal pain associated with a rise in serum amylase Ն 3-fold above the upper limit of normal within 24 hours of ERCP and also requiring more than one additional night of hospital stay.” The severity of PEP is based on the length of stay after the procedure. A length of stay of 2-3 days is graded as mild, 4-10 days as moderate and Ͼ 10 days or requiring intensive care and/or intervention for complications as severe PEP. 24 The consensus definition of PEP is distinct from the clinical definition of AP per 2006 American College of Gastroenterology (ACG) practice guidelines. 4 The combined use of CT scan with lipase level increases the diagnostic yield for PEP. 25 There are various mechanisms proposed for the etiology of PEP. The most common theory is mechanical trauma to the papilla, causing obstruction to the outflow of pancreatic juice. This is supported by prophylactic placement of a pancreatic duct stent, which decreased the incidence of PEP. Another theory is increased pancreatic duct pressure from the injection of contrast or saline, causing acinarization of the pancreas. Pancreatic infection from instrumentation is another hypothesis supported by prophylactic antibiotic usage decreasing the rate of post- procedure pancreatitis. ...
Context 3
... pancreas, a retroperitoneal gland that is often quoted as an organ of mystery, has both endocrine and exocrine functions ( Fig 1). Approximately 80% of the gross weight of the pancreas supports exocrine function, while the remaining 20% is involved with endocrine function. 1 Enzymes are produced within the pancreatic acinar cells, packaged into storage vesicles called zymogens, and then released via the pancreatic ductal cells into the pancreatic duct, from where they are secreted into the small intestine to begin the metabolic process needed to affect the major digestive activity of the gastrointestinal tract. The pancreas secretes 1500-3000 mL of iso-osmotic alkaline (pH Ͼ 8.0) fluid per day containing many enzymes and zymogens. We searched MEDLINE using the keywords acute pancreatitis (AP) AND etiology, diagnosis, laboratories, imaging, clinical features, treatment, management, complications, and differential diagnosis. The infor- mation is synthesized from the review articles, guidelines from gastroenterology societies, and original articles (1974-2011). Following ingestion of food, the vagal nerves, vasoactive intestinal peptide, gastrin releasing peptide, secretin, cholecystokinin (CCK), and encephalins stimulate enzymatic release into the pancreatic duct. The pancreas secretes amylolytic, lipolytic, and proteolytic enzymes. Amylase, the major amylolytic enzyme, hydrolyzes starch to oligosaccharides. The lipolytic enzymes include lipase, phospholipase A, and cholesterol esterase. Proteolytic enzymes which include trypsin, chymotrypsin, carboxypeptidases, aminopeptidases, and elastases act on peptide bonds of proteins and polypeptides. The proteolytic enzymes are secreted as inactive precursors (zymogens). These precursor enzymes reach the duodenum where trypsinogen, the proenzyme for trypsin, is activated by the brush border enzyme enterokinase. Trypsin then facilitates the conversion of the other pro-enzymes to their active form. Autodigestion of the pancreas is prevented by the packaging of proteases in precursor form and by the synthesis of protease inhibitors, such as pancreatic secretory trypsin inhibitor and serine protease inhibitor (SPINK1). 2 In addition, the acidic pH and a low calcium concentration in the zymogen granules guard against premature activation of the proenzymes. Whenever there is a loss of any of these protective mechanisms, zymogen activation and autodigestion occur, leading to AP. Pancreatic enzyme secretion is controlled by a negative feedback mechanism induced by the presence of active unbound proteases in the duodenum. Pancreatic inflammatory disease may be classified as AP and chronic pancreatitis. The pathologic spectrum of AP varies from a mild self- limited form of interstitial pancreatitis to a severe systemic form of necrotizing pancreatitis. 3 AP is defined by the presence of 2 of the 3 criteria : 1. Abdominal pain characteristic of AP; 2. Serum amylase and/or lipase Ն 3 times the upper limit of normal; and 3. Characteristic findings of AP on computed tomography (CT) scan. In 1992, the Atlanta International Symposium classified AP into mild AP (edematous/interstitial pancreatitis), which has a mortality of 1%, and severe AP (necrotizing pancreatitis), which constitutes about 20% to 30% of the AP with a mortality rate around 20% to 30%. 5 Determining the etiology of AP is crucial in the management of an acute episode and in the prevention of recurrent pancreatitis. Biliary and alcoholic pancreatitis constitute the majority of cases. In up to 30% of cases, etiology cannot be determined and they are labeled as “Idiopathic pancreatitis.” The potential causes are outlined in Table 1. Biliary pancreatitis is the most common cause of AP in the western world, accounting for 35% to 60% of patients with AP. The incidence of biliary pancreatitis has been increasing over the past decade. A higher incidence of gallstone pancreatitis is noted in Hispanics, whites, women, and persons over the age of 75 years. 7 The significance of determining a biliary etiology is important as it needs invasive treatment, and failure to identify it can lead to recurrent pancreatitis. The pathogenesis is multi- faceted, including duct, stone, and genetic related. 8 The passage of a gallstone or sludge causes local edema or transient spasm of the ampulla of Vater (Fig 1), causing transient obstruction of the pancreatic duct, resulting in increased pancreatic secretion, pancreatic edema, and/or necrosis. 9 The risk is increased with small gallstones Ͻ 5 mm, cystic duct diameter Ͼ 5 mm, multiple gallstones ( Ͼ 20), excess cholesterol crystals, and good gallbladder emptying. 10 Common bile duct diameter Ͼ 13 mm and a wide angle between bile duct and pancreatic duct are known ductal risk factors for AP. 11 Duodenal exclusion of pancreatic juices has been postulated in the pathogenesis. 12 The lack of trypsin results in an increase in CCK- releasing peptide because it is inactivated by trypsin. As a result, there is an increased level of CCK, resulting in increased pancreatic secretion. 13 During ampullary obstruction, the pressure gradient between pancreatic duct and biliary duct disappears, resulting in a reflux of infected bile juice into the pancreatic duct, which triggers pancreatitis. Genetic defects have also been postulated in the etiology of AP, the most important being the SPINK1 mutation, which results in decreased production of trypsin inhibitor. 14 Other genetic causes for acute recurrent biliary pancreatitis include mutations in the ABCB4 and CFTR genes. Alcohol is considered the leading cause of AP in patients with a history of alcohol consumption. Heavy alcohol use is the second most common cause of AP in developed countries. Moderate drinkers are defined as having 4-14 drinks/week in men and 4-7 drinks/week in women. Heavy drinkers are defined as having more than 14 drinks/week in men and more than 7 drinks/week in women. Alcohol does not cause AP directly. There has to be a cofactor involved with alcohol in the causation of pancreatitis. The cofactors identified are smoking, African American race, and a high-fat, high-protein diet. 15 Likewise, only a small proportion of alcohol abusers develop pancreatitis. Alcohol decreases the threshold for trypsin activation, which leads to pancreatic injury and also alters the severity of pancreatic inflammation. There is no established threshold for the amount of alcohol that causes pancreatitis. Several studies have postulated that the consumption of more than 80-100 g/d of alcohol for 5 years is a threshold for causing pancreatitis. Papachristou et al. identified chronic alcohol consumption ( Ͼ 2 drinks/day) as a major risk factor for the development of pancreatic necrosis in AP. 16 The theory is that the alcohol exposure shifts the mechanism of cell death from apoptosis to necrosis. 17 Recent studies have demonstrated smoking as an important cause of both chronic and idiopathic pancreatitis. 18-20 It is an independent risk factor and the risk is dose dependent. 20 It also has an additive/synergistic effect, with alcohol in the progression of pancreatitis. 21 The role of oxidative stress in the induction of pancreatitis has been postulated in active smokers. 22 Genetic influence has also been shown to affect the complex alcohol–smoking interaction. 23 The gastroenterology commu- nity continues to raise awareness of smoking as a risk factor for pancreatitis. 19 The 1991 consensus definition for Post-ERCP Pancreatitis (PEP) is “new onset of pancreatic type abdominal pain associated with a rise in serum amylase Ն 3-fold above the upper limit of normal within 24 hours of ERCP and also requiring more than one additional night of hospital stay.” The severity of PEP is based on the length of stay after the procedure. A length of stay of 2-3 days is graded as mild, 4-10 days as moderate and Ͼ 10 days or requiring intensive care and/or intervention for complications as severe PEP. 24 The consensus definition of PEP is distinct from the clinical definition of AP per 2006 American College of Gastroenterology (ACG) practice guidelines. 4 The combined use of CT scan with lipase level increases the diagnostic yield for PEP. 25 There are various mechanisms proposed for the etiology of PEP. The most common theory is mechanical trauma to the papilla, causing obstruction to the outflow of pancreatic juice. This is supported by prophylactic placement of a pancreatic duct stent, which decreased the incidence of PEP. Another theory is increased pancreatic duct pressure from the injection of contrast or saline, causing acinarization of the pancreas. Pancreatic infection from instrumentation is another hypothesis supported by prophylactic antibiotic usage decreasing the rate of post- procedure pancreatitis. ...
Context 4
... pathogenesis is multi- faceted, including duct, stone, and genetic related. 8 The passage of a gallstone or sludge causes local edema or transient spasm of the ampulla of Vater (Fig 1), causing transient obstruction of the pancreatic duct, resulting in increased pancreatic secretion, pancreatic edema, and/or necrosis. 9 The risk is increased with small gallstones 5 mm, cystic duct diameter 5 mm, multiple gallstones (20), excess cholesterol crystals, and good gallbladder emptying. ...

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... These are typical pancreatic pain, an increase in the level of serum amylase or lipase to over three times the upper limit of normal and/or radiological evidence of AP. There is some agreement that smaller increases in serum pancreatic enzymes could be accepted for the diagnosis of ACP [50][51][52][53][54][55] which is consistent with a decreased acinar cell mass, secondary to the fibroinflammatory process and pancreatic atrophy associated with CP [56]. In a study of ACP patients, serum amylase and lipase levels were increased to at least three times the upper limit of normal in only 20% and 60% of episodes and were within normal range in 36% and 24%, respectively [5]. ...
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... In these cases, prolongation of hospital stay and admission to intensive care units are common. Mortality rates of severe forms of pancreatitis vary by around 20 -30% [2], corresponding to the 14 th largest cause of death of gastrointestinal origin [3]. Early detection of prognosis of severity, are of fundamental importance in the management of these patients. ...
... The mortality rates vary from 1% in the mild form to 20-30% in the severe form, corresponding to the 14th main cause of death of gastrointestinal origin. 1,2 Clinically Acute pancreatitis was defined as two or more of the following: ...
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... The development in radiology has not only improved the diagnostic capabilities but also paved the way for interventions (Muniraj et al., 2012). ...
... The complications of acute pancreatitis are listed in table 8 (Muniraj et al., 2012). (Muniraj et al., 2012). ...
... The complications of acute pancreatitis are listed in table 8 (Muniraj et al., 2012). (Muniraj et al., 2012). ...
Thesis
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... 1,7 The pathogenesis of drug induced pancreatitis does not appear to differ from other causes of AP as discussed in several studies in the literature. [8][9][10] Exactly how medications induce AP is unknown, but postulated mechanisms include immune-mediated inflammatory response, direct cellular toxicity, pancreatic ductal constriction, arteriolar thrombosis, and metabolic effects. 1,7 Most of the 'evidence' supporting associations between drugs and AP are based on anecdotal case reports. ...
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Background: Acute pancreatitis (AP) is an inflammatory disease in which the regulatory pathway is complex and not well understood. Soluble suppression of tumorigenicity 2 (sST2) protein receptor functions as a decoy receptor for interleukin (IL)-33 to prevent IL-33/suppression of tumorigenicity 2L (ST2L)-pathway-mediated T helper (Th)2 immune responses. Aim: To investigate the role of sST2 in AP. Methods: We assessed the association between sST2 and severity of AP in 123 patients enrolled in this study. The serum levels of sST2, C-reactive protein (CRP) and Th1- and Th2-related cytokines, including interferon (IFN)-γ, tumor necrosis factor (TNF)-α, IL-2, IL-4, IL-5 and IL-13, were measured by highly sensitive ELISA, and the severity of AP in patients was evaluated by the 2012 Atlanta Classification Criteria. Results: Serum sST2 levels were significantly increased in AP patients, and further, these levels were significantly elevated in severe AP (SAP) patients compared to moderately severe AP (MSAP) and mild AP (MAP) patients. Logistic regression showed sST2 was a predictor of SAP [odds ratio (OR): 1.003 (1.001-1.006), P = 0.000]. sST2 cutoff point was 1190 pg/mL, and sST2 above this cutoff was associated with SAP. sST2 was also a predictor of any organ failure and mortality during AP [OR: 1.006 (1.003-1.009), P = 0.000, OR: 1.002 (1.001-1.004), P = 0.012, respectively]. Additionally, the Th1-related cytokines IFN-γ and TNF-α in the SAP group were higher and the Th2-related cytokine IL-4 in the SAP group was significantly lower than those in MSAP and MAP groups. Conclusion: sST2 may be used as a novel inflammatory marker in predicting AP severity and may regulate the function and differentiation of IL-33/ST2-mediated Th1 and Th2 Lymphocytes in AP homeostasis.