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Biomedical subjects

Yitzhak Cohen

Publications and source records attributed to Yitzhak Cohen.

6 recordsLinked to original sources
PubMed2005

Ventilatory and hemodynamic changes during retroperitoneal and transperitoneal laparoscopic nephrectomy: a prospective real-time comparison.

PURPOSE: Nephrectomies are currently performed via the transperitoneal or retroperitoneal laparoscopic approach. We compared the ventilatory and hemodynamic effects of these approaches. MATERIALS AND METHODS: After institutional ethics committee approval was obtained patients requiring nephrectomy in a 9-month period were prospectively allocated to the retroperitoneal (24) or transperitoneal (15) approach. All were initially ventilated in the volume controlled mode (10 ml kg tidal volume). Intraoperative fingertip, pulse derived arterial oxygen saturation less than 97%, end tidal CO2 partial pressure greater than 40 mm Hg and peak inspiratory pressure greater than 36 cm H2O necessitated changes in ventilatory parameters, as deemed necessary by the anesthetist. If tidal volume decreased greater than 25% of baseline, pressure controlled ventilation was begun instead. RESULTS: Peak inspiratory and plateau pressures increased for the transperitoneal approach by approximately 30% more than in the retroperitoneal group (p <0.05). Volume controlled ventilation was changed to pressure controlled ventilation in 8 transperitoneal vs zero retroperitoneal cases (p <0.05). Heart rate, and systolic and diastolic blood pressure increased by approximately 13% more in the transperitoneal than in the retroperitoneal group (p <0.05). CONCLUSIONS: Nephrectomy via the retroperitoneal laparoscopic approach interferes with ventilatory and hemodynamic functions less than nephrectomy via the transperitoneal approach.

Adult↗
PubMed2005

Evaluation of intravenous cannula and administration set fixation methods.

Intravenous cannula and administration set fixation is crucial for fluid resuscitation and intravenous administration of medications. Because conventional hospital fixations are insufficient for the military field scenario, two consecutive, prospective, randomized, clinical trials were performed in the Israel Defense Forces Medical School, to determine the most effective fixation method in the military arena. Gauze bandage, adhesive bandage, Coban wrap, and plastic wrap fixation methods were tested for field conditions and intravenous fluid flow. The results showed that plastic wrap is the fastest fixation method, withstands field conditions with minimal negative effects on the intravenous fluid flow, and is the most cost-effective.

Catheterization↗
PubMed2004

Increased propofol requirement during succeeding administrations for electroconvulsive therapy.

STUDY OBJECTIVE: To study patients' requirement for propofol dosages during the course of repeated deep sedation for electroconvulsive therapy (ECT). DESIGN: Prospective study. SETTING: Outpatient psychiatric clinic in a tertiary-care, university-affiliated, 1100-bed metropolitan hospital. PATIENTS: 30 patients undergoing 5-day successive ECT for depression over a 1-month period. INTERVENTIONS: Propofol and subsequently succinylcholine were injected intravenously (i.v.) to obtain deep sedation and relaxation followed by a 60 +/- 5 (SD) joules-ECT. MEASUREMENTS: The dosage that was required to deeply sedate the patients, the duration of the ECT, and interval of time to full wakefulness and coherent response were measured. MAIN RESULTS: 13 of 30 patients 1) required >100% increase in the dose of propofol to achieve the same pharmacological prerequisite sedative endpoint, starting from their third treatment onward; 2) there was a 35% abbreviated duration of the convulsive activity; and 3) there was a 21% shortened interval of time to full wakefulness and coherent communication, starting at the fourth propofol injection. CONCLUSIONS: Repeated injections of propofol in patients undergoing ECT under deep sedation can induce a tolerance-like reaction to the drug.

Ambulatory Care↗
PubMed2003

Perioperative myocardial ischemia in patients undergoing sternectomy shortly after coronary artery bypass grafting.

UNLABELLED: Coronary revascularization reduces cardiac complications associated with noncardiac surgery in patients with severe coronary disease. However, patients undergoing emergency noncardiac surgery soon after coronary bypass operations may still be vulnerable to ischemic myocardial events. We prospectively evaluated the incidence of myocardial ischemia in 82 consecutive patents scheduled for sternectomy in the first (Group 1; 35 patients) or second (Group 2; 47 patients) week after coronary artery bypass graft (CABG) surgery. The interval between CABG surgery and sternectomy in Groups 1 and 2 was 6 days (range, 4-7 days) and 11 days (range, 8-14 days), respectively. Electrocardiographic (ECG) changes consistent with myocardial ischemia were assessed with a two-channel Holter system for 48 h. There were no between-group differences in updated Acute Physiology and Chronic Health Evaluation score, use of beta-blockers, or perioperative hemodynamic changes. The incidence of ECG changes consistent with myocardial ischemia was fivefold more frequent in Group 1 (22.85% versus 4.25%; P < 0.05). Of the ischemic patients in Group 1, 25% experienced a perioperative acute myocardial infarction (one was fatal). There were no infarcts in Group 2. Thus, patients appear to be prone to coronary events during sternectomy performed early after CABG surgery. Although the incidence of ischemia did not differ from that previously reported after CABG surgery alone, further investigation is required to determine whether the findings obtained in this high-risk population are generalizable to patients undergoing noncardiac surgery soon after uneventful CABG surgery. IMPLICATIONS: This study demonstrates an increased incidence of myocardial ischemia when sternectomy for mediastinitis is performed within one week of coronary artery bypass graft surgery, and this ischemia is associated with a 25% incidence of myocardial infarction.

Aged↗