Hemodynamic Studies with Differential Pressure Technique

Abstract

Abstract P orjé I. G. and B. R udewald . Hemodynamic studies with differential pressure technique. Acta physiol. scand. 1961. 51. 116–135. A theoretical analysis of the fluid motion in a circular elastic tube is presented. The formulae for computation of pulsatile flow and other hydro‐dynamic data are discussed. Apparatus and technique for recording differential pressure are, described. Results of studies of the hydrodynamics in a model circulation system show that the theory is valid. For kinematic viscosities ranging from 1–9 cst the differential pressure is in the main unaltered. Original differential pressure records from the ascending aorta in cases with normal aortic valves are presented and their features described. Blood velocity curves computed from such curves are presented. To illustrate the use of the method the effect of the Valsalva manoeuvre and a nitrite (Etrynit, Bofors) upon the aortic blood motion are demonstrated.