Abstract

Partial heart-lung bypass is one form of artificial circulation proposed for assisting the failing heart. Since it involves extracorporeal gas exchanges, respiratory as well as circulatory functions must be considered during the procedure. Our studies reveal that an accurate knowledge of the systemic blood volume is necessary to control the distribution of blood flow between the intracorporeal and extracorporeal circuits. The systemic blood content also influences the pulmonary ventilation. Partial heart-lung bypass can be performed in such a manner that it completely fulfills the metabolic requirements of the body tissues. Whether abnormal hemodynamic conditions in heart failure can be relieved by partial heart-lung bypass after the period of active circulatory assistance is still to be evaluated.

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