Computerized servomechanism for increasing coronary flow

Abstract

The experimental data for arterioarterial counterpulsation are presented and compared with the data available for partial venoarterial bypass for both the central and peripheral circulations. It may be argued that since with arterioarterial counterpulsation the pump is in series with the heart, it is dependent on the cardiac output. However, by small infusions from the reservoir, phasic coronary perfusion can be conducted and the cardiac output elevated so that the effect becomes more and more pronounced as time progresses. Certainly, partial venoarterial bypass with oxygenation has its own problems. Not only does the oxygenator provide difficulties, but its lifetime is short. In addition, venous return is often poor in those patients in whom the use of this modality is desirable. We have also attempted to categorize cardiogenic shock into various types in an endeavor to ascertain where at this time such mechanical assistance to the failing heart might find its highest yield.