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J Thorac Cardiovasc Surg 1998;116:148-153
© 1998 Mosby, Inc.
Cardiopulmonary Support And Physiology |
This work was supported by an operating grant from the Medical Research Council of Canada.
Received for publication June 27, 1997 Revisions requested Sept. 15, 1997. Revisions received Feb. 4, 1998. Accepted for publication Feb. 4, 1998. Address for reprints: Ray C.-J. Chiu, MD, The Montreal General Hospital, 1650 Cedar Ave., Room C9.169, Montreal, Quebec, Canada H3G 1A4.
Objective: Because adynamic cardiomyoplasty, or wrapping skeletal muscle around the heart, had been shown to provide a girdling effect and delay progressive ventricular dilatation in heart failure, a similar girdling effect by the much simpler procedure of cardiac binding, using a prosthetic membrane to wrap the heart, was studied and compared with that of adynamic cardiomyoplasty.
Methods: Twenty-one dogs were divided into control, adynamic cardiomyoplasty, and cardiac binding groups. Cardiac dimension and hemodynamic studies were carried out before and 4 weeks after rapid pacing at 250 beats/min. For adynamic cardiomyoplasty, the left latissimus dorsi muscle was used for the cardiac wrap; for cardiac binding, a Marlex sheet (C. R. Bard, Inc., Murray Hill, N.J.) was used. Serial two-dimensional echocardiography, right heart catheterization, and in the cardiac binding group, left heart catheterization were performed.
Results: Four weeks of rapid pacing induced severe heart failure and cardiac dilatation. The magnitude of ventricular dilatation at the end of rapid pacing was less in the cardiac binding group than in the control group and least in the adynamic cardiomyoplasty group. Left ventricular end-diastolic volume, end-systolic volume, and ejection fraction were 82.1 ± 21.1 ml, 67.1 ± 16.0 ml, and 17.5% ± 5.8%, respectively, in the control group; 61.9. ± 8.1 ml, 44.1 ± 7.8 ml, and 30.1% ± 3.6%, respectively, in the cardiac binding group; and 51.8 ± 8.7 ml, 30.3 ± 10.4 ml, and 27.0% ± 4.0%, respectively, in the adynamic cardiomyoplasty group.
Conclusions: Both adynamic cardiomyoplasty and cardiac binding reduced cardiac enlargement and functional deterioration after rapid pacing, with adynamic cardiomyoplasty appearing to be more effective, perhaps because of the adaptive capabilities of the skeletal muscle wrap. However, cardiac binding is a simpler and less invasive procedure, which may be useful as an adjunct to prevent or delay progressive ventricular dilatation in heart failure. (J Thorac Cardiovasc Surg 1998;116:148-53)
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