Registro con sensores piezoeléctricos de la actividad del elemento contráctil [quot ]in vivo[quot ] en estenosis aórticas experimentales agudas y crónicas. / [Recording, with piezoelectric sensors, of the activity of the contractile elements in vivo in experimental acute and chronic aortic stenosis]

ABSTRACT

Mechanic alterations of the left ventricular wall due to an increasing afterload by means of experimentally provoked acute and chronic aortic stenosis, registered by piezoelectric sensors sutured on the surface of the ventricle, are analyzed. Tension or force developed in the ventricular wall or the acceleration of the shortening velocity of the contractile element, under these conditions, show in the piezoelectric sensor curve a new characteristic contractile state depending on the rapidity and time elapsed since the aortic stenosis, making clear the diagnosis, systolic peaks and their evolutionary stage. Different adaptation mechanisms employed by the myocardium, according to the rapidity of the experimental stenosis, showed by means of the variations of the different phases of the cardiac cycle depicted by sensor curves, are also described.