Abstract
An electronic circuit for servocontrolled computation of instantaneous aortic blood flow i(t) from instantaneous aortic blood pressure p(t) is devised with equation: i(t)=p(t)/R+C•dp(t)/dt, where the arterial system is regarded as a Windkessel (compression chamber), R is its resistance and C is its compliance. In this circuit, R is resistance of a photocell (CdS) and its value is servocontrolled by the light of a lamp which is controlled to make computed i(t) zero at the end of each diastole (at R wave of EKG). Its biological application in dogs resulted in satisfactory agreement of computed i(t) with that measured by an electromagnetic flowmeter.
