In hypertensive subjects-carotid sinus stimulation can lower blood pressure to normal or subnormal. The reflection shortens the fatigue of cardiac patients undergoing exercise testing. In acute left ventricular failure accompanied by hypertension-carotid sinus massage is a therapeutic procedure recommended.

By various methods has been possible to obtain all of monophasic action potential in accordance with the theory of the membrane were theoretically predictable. In an injured area resting potential of the membrane may remain unchanged, being zero or supernormal subnormal. Consequently they can register monophasic action potential currents without damage, or injury caused by streams or hipopolarización membrane hyperpolarization. The only essential requirement to record monophasic action potentials is blocking the excitation, the current of injury is a phenomenon that attachment may or may not be present. When the heart muscle is severely injured the excitation process is blocked and then monophasic action potentials are inscribed. By decreasing the damage processes depolarization and repolarization are performed slowly and then enroll QRS-T complex and large widths. When the deterioratio...

There are many researchers who are regarded as precursors of modern ballistocardiography; have also been countless instruments with which for many years has tried to obtain records from the mechanical activity of the heart. The merit of a systematic study and a suitable instrument belongs to STARR, Philadelphia.

Modifications r waves early in the right precordial leads when a left locking occurs due to abnormal excitation current in the septum. The way of activation wave progresses in the regions engaged by the lock and the abnormal orientation of the vectors representing the electric forces in these regions, may explain the QRS-T changes observed in the electrocardiograms at the left locking ensue . Analysis of correlative changes "Waves B" or waves and blocking waves represent the normal ventricular activation clarification pathogenesis of the left blocks. The left blocks are manifested electrocardiographically as "intramural". The different lock types are to be left to the extent and magnitude of functional impairment of specialized muscle fibers in which the activation proceeds very quickly. For its size the left blocks are "partial" or "total". The duration of the ventricular complex does n...