Cineangiocardiographic studies of puppies and full-grown dogs.

Abstract

AbstractGribbe P., L. Hirvonen T. Peltonen. Cineangiocardiographic studies of puppies and full‐grown dogs.Cineangiocardiographic studies have been carried out on puppies and full‐grown dogs. The volumes of the left atrium and the left ventricle were calculated using 35‐mm film, exposed at a rate of 48 pictures per second. The stroke volume and residual blood volume were calculated from the volume curves. The stroke volume calculated as a percentage of the end‐diastolic volume was larger for the puppies (77 per cent) than for the full‐grown dogs (60 per cent). In relation to their body weight the stroke volume for the full‐grown animals was 60 per cent lower than that for the puppies. The pulmonary circulation time increased with age. It was shorter in puppies than in full‐grown dogs, both absolutely and in terms of the number of cardiac cycles which it occupied. The prolongation of the pulmonary circulation time with advancing age, when expressed in terms of the number of heart cycles which it occupies, may be mainly due to a decrease of the stroke volume in relation to the body weight.