Abstract
In dogs with atrioventricular block and implanted ascending aortic flow probes, cardiac output can be controlled on each beta. The procedure is implemented through on-line use of a digital computer. The algorithm has three steps: 1) aortic flow is measured and integrated to give stroke volume; 2) at the end of ejection, the program computes how long the current beat must be to keep cardiac output at a target level; and 3) the ventricle is stimulated at the proper time. Cardiac output can be controlled over a range of 60-110% of normal in a resting dog. This range can be expanded by combining hemorrhage or volume infusion with the control procedure.
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