ELEMENTARY THEORY OF SYNCHRONOUS ARTERIO-ARTERIAL BLOOD PUMPS.
Abstract
In the technique of arterio-arterial pumping, a volume of fluid is withdrawn from the aorta during systole and reinjected during diastole, thereby reducing the systolic pressure of the heart and adding energy to the systemic circulation. It is found that an upper bound for the effectiveness of such devices is given by the formula (delta Q sub h/Q sub hu) - (delta P sub 1/P sub 1u) = (Q sub b/Q sub hu) ((P sub 1u - P sub 2u)/P sub 1u) where Q sub hu is the stroke output of the unaided heart and delta Q sub h is the increment caused by the pump with a stroke Q sub b. P sub 1u and P sub 2u are the systolic and diastolic pressures (unaided). Delta P sub 1 is normally negative and represents the reduction in ventricular pressure. The division of effort of the pump between the reduction of pressure and the increase of flow depends on the physiological-mechanical impedance of the heart. The total effect is, however, independent of the impedance. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1967
- Accession Number
- AD0657000
Entities
People
- Arthur R. Kantrowitz
- Harry E. Petschek
- Robert T. Jones