Phonocardiography is-often more valuable than electrocardiography in timing mechanical events in the cardiac cycle. This study shows that the opening and closing of the mitral valve are related to the length of the previous heart cycle as demonstrated by the variations occuring in aluricular fibrillation. These variations in valve action are controlled by the pressure gradient between left auricle and ventricle.
Diagnosis of lesions of the tricuspid valve is often difficult. Mechanically, however, the action of this valve is capable of study through its effect upon the peripheral veins, somewhat as the disturbances of the aortic valve are reflected in the peripheral arteries. The conditions to be differentiated are "organic" versus "functional" regurgitation, and obstruction of the valve from rheumatic stenosis. Graphic records of the venous pulse with suitable reference tracings may make this possible.
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