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Circulatory support for patients experiencing postcardiotomy cardiogenic shock: analysis of risk factors for death and long-term follow-up.
Artificial Organs 1993 July
Over the last 5 years, 12 patients received ventricular assist devices (VADs) while in postcardiotomy cardiogenic shock. There were 7 male and 5 female patients ranging in age from 22 to 73 years (average age, 54). Eight patients underwent surgery for valve replacements, 3 for coronary artery bypass graftings, and 1 for closure of a ventricular septal rupture. The duration of VAD support ranged from 6 h to 9 days (mean, 4.2 days). Ten patients were weaned from the VADs, and 6 survived. Univariate analysis indicated that renal failure, infection, and heart failure had a negative impact on those patients who survived. Multivariate analysis indicated that heart failure, renal failure, and preoperative left ventricular ejection fraction were the most important predictors of hospital death. The 6 survivors were followed for 4 to 42 months (mean, 25 months); 5 were in New York Heart Association (NYHA) Class I, and 1 was in Class II. The cardiac functions in 5 patients who lived over 1 year were assessed by echocardiography. Preoperative and postoperative UCG revealed that ejection fraction and mean velocity of circumferential fiber shortening increased significantly (p < 0.01). Also, the left ventricular diastolic and systolic dimensions decreased significantly (p < 0.05). However, the patients did not show further changes in these parameters during exercise. Eight patients who had double valve replacements were observed for comparison (control group). In the control group, exercise improved cardiac output and mean velocity of circumferential fiber shortening (p < 0.01).(ABSTRACT TRUNCATED AT 250 WORDS)
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