Anesthesia and analgesia
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Anesthesia and analgesia · Jan 1994
Randomized Controlled Trial Comparative Study Clinical TrialCoagulation tests, blood loss, and transfusion requirements in platelet-rich plasmapheresed versus nonpheresed cardiac surgery patients.
The results of several studies suggest that acute platelet-rich plasmapheresis decreases blood loss and allogeneic blood product transfusion requirements in cardiac surgery patients. We designed a randomized, prospective study to determine whether acute platelet-rich plasmapheresis decreases blood loss and allogeneic transfusion requirements in primary cardiac surgery patients. Forty patients were randomized to a control or pheresis group. ⋯ Chest tube drainage and transfusion requirements were recorded. There were no differences in the coagulation tests, platelet counts, chest tube drainage, or allogeneic blood product transfusion requirements between the two groups at any time. The authors conclude that the use of acute platelet-rich plasmapheresis in primary cardiac surgery patients does not decrease chest tube drainage or the need for allogeneic blood transfusions.
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Anesthesia and analgesia · Jan 1994
Randomized Controlled Trial Comparative Study Clinical TrialComparisons of tetracaine spinal anesthesia with clonidine or phenylephrine in normotensive and hypertensive humans.
To compare the hemodynamics and anesthetic effects of spinal tetracaine containing either clonidine or phenylephrine administered to normotensive or hypertensive patients, we studied 75 patients allocated to one of three groups, each of which included nine hypertensive patients: clonidine group (n = 25) received 2 mL of 0.5% tetracaine (10 mg) containing clonidine (0.15 mg); phenylephrine group (n = 25) received 2 mL of 0.5% tetracaine (10 mg) containing phenylephrine (3 mg); and control group (n = 25) received 2 mL of 0.5% tetracaine (10 mg) alone. Analgesic levels and the intensity of motor block obtained did not differ significantly among the three groups. ⋯ Mean blood pressure (MBP) in both hypertensive and normotensive patients given tetracaine-clonidine remained approximately 20% lower than that in the control group for as long as 7 h after the injection (P < 0.05). We conclude that the inclusion of clonidine can provide similar effects to that of phenylephrine with respect to prolongation of hyperbaric tetracaine spinal anesthesia, but could cause more hypotension, without bradycardia, in both normotensive and hypertensive patients for a prolonged time (i.e., 420 min).
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Anesthesia and analgesia · Jan 1994
ReviewAssociation of preoperative risk factors with postoperative acute renal failure.
We performed a systematic review of 28 studies that examined preoperative risk factors for postoperative renal failure. Included in the studies were 10,865 patients who underwent either vascular, cardiac, general, or biliary surgery. No two studies used the same criteria for acute renal failure. ⋯ Of the 30 variables considered in the studies, preoperative renal risk factors, such as increased serum creatinine, increased blood urea nitrogen, and preoperative renal dysfunction were repeatedly found to predict postoperative renal dysfunction. The literature provides little quantitative information concerning the degree of risk associated with other factors. Cardiac risk factors, such as left ventricular dysfunction, were reported to be predictive of postoperative renal failure more consistently than was advanced age.
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Anesthesia and analgesia · Jan 1994
Multicenter Study Comparative StudyThe postoperative interview: assessing risk factors for nausea and vomiting.
Most studies of postoperative nausea and vomiting have concentrated on single etiologic factors and have not detailed the method of assessing these symptoms. This study used postoperative interview data from patients at four teaching hospitals during 1988-89, to determine 1) risk factors for nausea/vomiting, 2) whether the type of surgery affected the rate of nausea/vomiting among female patients, 3) whether differences in rates across hospitals were due to differences in patient case-mix, and 4) whether there were differences in the rate of nausea/vomiting among the patients of individual anesthesiologists. Research nurses performed 16,000 interviews (59% of all inpatients) from a closed-question standardized format. ⋯ We found marked variations in the rate of nausea/vomiting across hospitals (range, 39% to 73%), and these variations were not explained by the case-mix of patients. The rate of nausea/vomiting varied substantially across anesthesiologists in each hospital and the differences were not explained by differences in the patients they managed. Thus in the time period immediately preceding the introduction of newer antiemetic drugs, we found that the rates of this common problem were persistently high as perceived from the patients' point of view.