[Factors that affect the mortality in patients receiving emergency surgery for ruptured abdominal aortic aneurysms].

This retrospective study was performed to identify the perioperative factors affecting the mortality rate in 28 patients, who had received emergency surgery for ruptured abdominal aortic aneurysms from January, 2005 to June, 2008. Five (17.9%) of these 28 patients died of massive bleeding, sepsis, or multiple organ failure during or within 11 days after surgery. Various factors which might influence the outcomes were compared between the survivors and non-survivors. Preoperative hypotension defined as a systolic blood pressure < or = 80 mmHg associated with hemorrhagic shock was the only significant factor affecting the mortality. There were no significant differences in age, gender, the time from the admittance to the hospital to aortic cross clamping, duration of surgery, and the amount of blood products transfused and intraoperative blood loss, between the two groups. Of great importance is that preoperative hypotension should be corrected before the onset of hemodynamic deterioration.

Anesthetic management of a patient with deteriorated cardiac function following cardiopulmonary resuscitation.

A 73-year-old woman suffering from an abdominal aortic aneurysm (AAA), unstable angina, and low cardiac function (32% of ejection fraction) was scheduled for abdominal aortic replacement and coronary artery bypass grafting. However, before the scheduled operation the patient fell into cardiopulmonary arrest with ventricular fibrillation due to rupture of the AAA. Immediate cardiopulmonary resuscitation (CPR) using epinephrine and electrical defibrillation restored the spontaneous circulation. Following CPR, a continuous high-dose dopamine infusion (15 µg/kg/min) was initiated and emergent abdominal aortic replacement was performed. On arrival at the operating room, the patient showed serious hypotension, atrial fibrillation with multifocal ventricular premature contractions, and metabolic acidosis. Transesophageal echocardiography (TEE) suggested that the circulatory collapse might have resulted from diastolic dysfunction and deteriorated compliance of the left ventricular (LV) wall, possibly due to myocardial stunning induced by myocardial ischemia, and tachycardia induced by hypovolemia, both of which are influenced by high doses of catecholamine. We accordingly transfused adequate amounts of blood products and gradually decreased the infusion rate of dopamine to 4 µg/kg/min, while carefully monitoring blood pressure, central venous pressure, and TEE. By the end of surgery hemodynamic parameters had recovered to near normal levels. In post-resuscitated and hypovolemic patients, caution should be taken when administering high levels of exogenous catecholamines, which can induce myocardial stunning and circulatory collapse.

Cuff occlusion on the left upper arm increases flow of the left internal mammary artery and bypass flow to the left anterior descending artery.

PURPOSE: Changes in vascular resistance in the left forearm may affect the flow of left internal mammary artery (LIMA)- to left anterior descending artery (LADA) bypass, because the LIMA is a major branch of the subclavian artery. We studied the effects of occlusion of the left upper arm on blood flow of LIMA-to-LADA bypass in patients undergoing coronary artery bypass grafting (CABG). METHODS: In ten patients, the blood volume shed from LIMA with the distal end open (LIMA free flow) was stored for 1 min before and during cuff inflation in CABG surgery. LIMA-LADA bypass flow was measured with ultrasonic flow-metry before and after cuff inflation on the left upper arm in an other ten patients. Mean arterial blood pressure (MAP), heart rate (HR), and electrocardiograms (ECGs) were monitored throughout the studies. RESULTS: LIMA free flow (ml x min(-1)) increased from 50.3 +/- 7.1 to 60.9 +/- 8.4 (P < 0.01) at the end of 1-min cuff inflation. LIMA-LADA bypass flow (ml x min(-1)) increased from 31.4 +/- 3.7 to 39.7 +/- 4.0 (P section sign 0.05) at 1 min after cuff inflation. MAP, HR, and ST segments on ECGs did not show any significant changes related to measurement times. CONCLUSION: LIMA-LADA bypass flow increased after cuff inflation on the left upper arm and returned to the baseline values after cuff deflation. Anesthesiologists should be aware of this relationship between local vascular resistance and bypass flow for the evaluation of LIMA-LADA anastomosis.