BACKGROUND Premature ventricular contractions originating in the left ventricle outflow tract represent a significant subgroup of patients referred for catheter ablation. Mechanical artifacts from aortic valve leaflet motion may be observed during mapping, although the incidence and characteristics have not been reported. METHODS AND RESULTS Twenty-eight consecutive patients with left ventric...

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 auri...

Changes in left ventricular volume appear to be important in changing the timing and duration of mitral valve prolapse. In this study, simultaneous phonocardiograms and echocardiograms were recorded in 16 patients with late systolic mitral valve prolapse before and after the inflation of congesting cuffs (tourniquets) on the upper and lower extremities. The tourniquet application, known to redu...

The quantity of the conventional sources energy such as petroleum, coal, and deposits hydrocarbon are limited in nature. rapid growth is observed industrial transportation section due to increase population that has compelled mankind look for an alternative fuels. Biodiesel can be a potential substitute its ease availability, accessibility, lower cost, nontoxic characteristics. In this study, w...

We report the case of a 62-year-old woman in whom carcinoid disease had been diagnosed 6 years earlier. She subsequently developed tricuspid and pulmonary valve disease. Both valves were incompetent and mildly stenotic. The tricuspid valve required surgery; the pulmonary vaive was explored but not treated. Valve surgery in patients with carcinoid disease is discussed in light of the prognosis o...

We report a new method of detection of the timing of the aortic and pulmonary valve closure that depends not on the registration of audible vibrations, but rather, on subtle but distinct movements of the chest wall, which are external manifestations of these events. We studied these phenomena in six open-chest dogs and in 69 human subjects. The dog studies show that the two distinct inward move...

We report a new method of detection of the timing of the aortic and pulmonary valve closure that depends not on the registration of audible vibrations, but rather, on subtle but distinct movements of the chest wall, which are external manifestations of these events. We studied these phenomena in six openchest dogs and in 69 human subjects. The dog studies show that the two distinct inward movem...

this research was performed to monitor the effects of different practice schedules on learning and transfer of generalized motor program and timing parameter in a serial task. for this purpose, 80 participants (age: 19-23 years) voluntarily participated in this research and then they were divided randomly into 4 groups: blocked, random, blocked-random and random-blocked. this test included perf...

The management of valvular heart disease has markedly changed during the past decades. The timing of intervention—surgically and more recently also by catheter intervention—is no longer primarily driven by the goal of symptom relief for the patient. Treatment strategies aim now for an optimal long-term outcome with regard to both morbidity and mortality. The observation that patients may have a...