Abstract
Cannulae combined with electrodes were devised for simultaneous recordings of intracardiac blood pressures and electrocardiograms from the carp ranging from 700 to 1, 000 g in body weight.Cannulae were implanted at any two of three sites: dorsal aorta, bulbus arteriosus and ventricle.Size of cannula, site of cannula implantation and type of transducer adequate for the blood pressure measurements were investigated. In the confined but not anesthetized, systolic blood pressures in the bulbus arteriosus were either equal to or slightly less (about 1.0 mmHg) than those recorded in the ventricle.Pulsating pressures were much less in the bulbus arteriosus than in the ventricle.As in other fish, carp also showed a less of pressure across the gill vasculatre, and the loss amounts to about one-third of that generated by the heart.In an undisturbed state, heart rate became low and nonrhythmical.Ventricular contractions were performed in small group with short pauses between series.
