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Effect of assisted circulation on left ventricular performance in a canine model
Y Uozaki1, A Murakami, H Asanoi
1First Department of Surgery, Toyama Medical and Pharmaceutical University, Sugitani, Japan.
The Annals of Thoracic Surgery
|April 4, 1998
Summary
Left heart bypass (LHB) offers superior left ventricular performance compared to venoarterial bypass after aortic cross-clamping. LHB optimizes ventricular-arterial coupling and maximizes work efficiency for better cardiac support.
Area of Science:
- Cardiovascular Physiology
- Cardiac Surgery
- Mechanical Circulatory Support
Background:
- Left ventricular (LV) performance during venoarterial bypass and left heart bypass (LHB) after descending thoracic aorta cross-clamping is poorly understood.
- Evaluating the impact of these bypass methods on ventricular load optimization and LV work efficiency is crucial.
Purpose of the Study:
- To compare the effects of venoarterial bypass and LHB on left ventricular performance.
- To assess ventricular load optimization and left ventricular work efficiency under these bypass conditions.
Main Methods:
- Utilized conductance catheter and micromanometer in 7 anesthetized mongrel dogs.
- Assessed preload (end-diastolic volume), afterload (effective arterial elastance), and LV contractility (end-systolic pressure-volume relationship slope).
- Calculated optimal ventricular-arterial coupling and LV work efficiency.
Main Results:
- LHB resulted in a significantly greater decrease in preload compared to venoarterial bypass.
- No significant differences were observed in afterload or LV contractility between the two bypass methods.
- LHB achieved near-optimal ventricular-arterial coupling and maximal work efficiency.
Conclusions:
- Left heart bypass demonstrates a more favorable effect on left ventricular performance post-descending thoracic aorta cross-clamping.
- LHB is a potentially superior strategy for cardiac support in this clinical scenario.