Timothy J. Ranval's research while affiliated with William Beaumont Army Medical Center and other places

... The consequences of these measurement inaccuracies are potentially far-reaching and serious. Inaccurate calculations can lead to overestimation of the severity of carotid stenosis [71,72]; as a result, patients may be advised to undergo unnecessary surgical interventions such as carotid endarterectomy (CEA) or carotid artery stenting (CAS). These procedures are not risk-free and carry potential complications, including stroke, cranial nerve injuries, and even death. ...

... Yet, there remains considerable variability in the performance and interpretation of results. 13,14 Results from our study underscore the importance of standardizing the major technical components of carotid duplex testing-in routine situations as well as in commonly encountered anomalies such as carotid tortuosity. ...

... Several techniques have been developed to reduce the risk of restenosis including the use of a bovine pericardial, expanded polytetrafluoroethylene (ePTFE) or other autologous patch 2,4 . The use of a patch is standard following femoral endarterectomy at most institutions; however, proper technique and sizing is critical to prevent an increased risk of stenosis due to patch angioplasty itself 5 . Prior studies have identified patches after carotid endarterectomy as areas of perturbed flow with resultant increases in oscillatory shear index and turbulence, which contribute to neointimal hyperplasia and restenosis [5][6][7] . ...

... Therefore, we did not report asymptomatic DVT events. However, the higher risk of progression to PE in symptomatic DVT patients, 33,[37][38][39] as well as the recommendations against the routine ultrasonographic screening of DVT following TJA procedures from the AAOS, 5, 6 make this clinical practice appropriate. Second, despite the large number of included patients in this study (N=7,511), the number of symptomatic VTE events was small (N=33, 0.44%). ...

... The vein was handled minimally throughout the dissection, and a topical papaverine (Eli Lilly, Indianapolis) bathing solution, 0.1 mg/ml, was used to prevent vasoconstriction. 5 Side branches were ligated and divided at least 2 mm from the jugular vein. Cells were harvested by an enzymatic single-stage technique. ...

... According to the observations made by Ranval et al. (1994), stenosis of the internal carotid artery could be due to the effects of a transverse neurofascial band between the vagus and hypoglossal nerves or a large cervical contribution to the ansa cervicalis. Thus, the present report may benefit reconstructive surgery. ...

... Vascular intervention includes angioplasty or stentingdepending upon the findings on DSA. With proximal blocks bypass grafting may be helpful.[25,26] Hyperbaric oxygen therapy (HBOT) is salvage forpatients with PAD wherein all modalities have been utilized with poor results. ...

... To address these questions we used indirect evidence, including studies assessing VTE (eg, PE and DVT) and mortality in lung resection, pneumonectomy or extended resections, and esophagectomy in cohorts in which all patients underwent postoperative screening for VTE or cohorts in which postoperative VTE events were detected through clinical suspicion and symptoms, followed by confirmatory testing (see Tables E2, E3, and E4). For lung resection (lobectomy/segmentectomy), we identified 5 observational studies [188][189][190][191][192] that reported on outcomes detected by screening and 7 observational studies [193][194][195][196][197][198][199] reporting on outcomes detected by clinical suspicion and symptoms. For pneumonectomy and extended resections, we identified 2 observational studies [192,200] reporting on outcomes detected by screening and 3 studies [194,195,201] with detection by clinical suspicion and symptoms. ...

... In such cases, circumferential (sleeve) resection of the PA always produces a wide distance between the 2 vascular stumps with consequent high tension on the direct anastomosis [5]. After sleeve resection with excessive distance between the 2 vascular stumps, a conduit interposition has been reported to be a feasible and effective reconstructive option in our and others' few experiences [9][10][11]. However, this procedure is still used infrequently by thoracic surgeons because of the technical complexity and related risk of complications. ...

... The etiology of the VT subtypes is clearly related, they share the same risk factors and the origin of both can be both hereditary and/or acquired 6,12 . However, SVT and DVT are frequently found simultaneously 13 . This is because patients who present VT have the particular characteristic of having the three components of Virchow's triad: (a) impairment in blood flow such as stasis, (b) acquired or inherited hypercoagulability (c) vascular endothelial injuries [14][15][16] . ...