Obesity surgery
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Venous thromboembolic (VTE) disease is a much-feared complication of bariatric surgery. The most common unexpected cause of death in the morbidly obese patient is pulmonary embolism (PE). Recent data supports the expanded use of systemic thrombolytics in hemodynamically stable patients with PE and echocardiographic evidence of right ventricular (RV) dysfunction. ⋯ To our knowledge, this is the first report of systemic thrombolysis for a submassive PE after bariatric surgery in a hemodynamically stable patient with RV dysfunction. Given the high incidence and morbidity of VTE disease in this population, and the expanding indications for thrombolytic therapy, successful cases such as these should be documented.
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Obesity is a well known risk factor for obstructive sleep apnea (OSA). Medical therapy is not effective for morbid obesity. Bariatric surgery is therefore a reasonable option for weight reduction for patients with clinically severe obesity. Unrecognized OSA, especially in those patients receiving abdominal surgery, has influenced perioperative morbidity and morality. The incidence of OSA for patients being evaluated for bariatric surgery has not been previously defined. ⋯ This population of clinically severe obese patients being evaluated for bariatric surgery had an 88% incidence of an OSRBD, 71% with OSA. Appropriate therapy with CPAP perioperatively would theoretically prevent hypoxic complications associated with OSRBD. Providers should have a low threshold for ordering a PSG as part of the preoperative evaluation for bariatric surgery. Empiric CPAP at 10 cm H2O should be considered for those patients who cannot complete a PSG before surgery.
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We examined our database of 600 consecutive laparoscopic Roux-en-Y gastric bypasses (LRYGBP) to determine predictors of prolonged operations, conversion to open operations and postoperative complications. ⋯ Larger patients as measured by waist measurement, weight, and BMI but not previous surgery prolonged LRYGBP. Conversion to open surgery was more frequently necessary in patients with larger abdomens, central obesity, and type II diabetes. Complications did not correlate with any preoperative parameter measured.
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Comparative Study
Helium pneumoperitoneum ameliorates hypercarbia and acidosis associated with carbon dioxide insufflation during laparoscopic gastric bypass in pigs.
In the morbidly obese patient undergoing laparoscopic gastric bypass (LGBP), insufflation with carbon dioxide to 20 mmHg for prolonged periods may induce significant hypercarbia and acidosis with attendant sequelae. We hypothesize that the use of helium as an insufflating agent results in less hypercarbia and acidosis. ⋯ Helium pneumoperitoneum in LGBP is associated with less intraoperative hypercarbia and acidosis than is the use of CO2. In addition, pCO2 returns to normal more rapidly postoperatively with the use of helium insufflation. Study of helium insufflation in humans undergoing LGBP is needed to prove its benefits in the clinical setting.
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The effects of morbid obesity, pneumoperitoneum (PP) and body position on cardiac function during laparoscopy were studied. ⋯ Anesthetized obese patients undergoing laparoscopy have higher LVESWS before pneumoperitoneum (due to increased end-systolic left ventricular dimensions) and during pneumoperitoneum (due to more pronounced increases in blood pressure). Since LVESWS is a determinant of myocardial oxygen demand, more aggressive control of blood pressure (ventricular afterload) in MO patients may be warranted to optimize the myocardial oxygen requirements.