Abstract
A method is described for measuring cyclic variations in the velocity of blood flow in unopened blood vessels based on the induction of an e.mi. in the blood when moving through a magnetic field. Cyclic variations in the velocity of blood flow through the carotid artery of anesthetized dogs were recorded with this D.C. method under various conditions, viz: with the anesthetized animal intact; with the chest opened; during rapid saline infusion; during partial occlusion and after release of the thoracic aorta; during aortic valve insufficiency in which an early diastolic back flow was demonstrated; during marked cardiac arrhythmia; during ectopic beats, and during gasping respiration. The characteristics of the velocity curves in each case are described and their significance discussed.

This publication has 4 references indexed in Scilit: