Assessment of aortic valve stenosis severity using intelligent phonocardiography

Assessment of aortic valve stenosis severity using intelligent phonocardiography.

The assessment of mitral stenosis by phonocardiography.

Clinical assessment of the severity of mitral stenosis sometimes presents difficulties. The symptoms may be obscured by superadded effort syndrome or by limitation of activity imposed by the patient's doctor. The physical signs may reveal the presence of pulmonary hypertension or heart failure, but in their absence there may be little indication as to the size of the mitral orifice. The intensi...

Assessing the severity of aortic stenosis by phonocardiography and external carotid pulse recordings.

Phonocardiograms and carotid pulse tracings were done on a group of 47 patients with all degrees of aortic stenosis and were compared with two groups of normals. Indices evaluated were pre-ejection period, left ventricular ejection time, maximum rate of arterial pulse rise, arterial half rise time (T time) and upstroke time, and timing of the peak intensity of the systolic murmur in relation to...

Inaccuracies in using aortic valve gradients alone to grade severity of aortic stenosis.

The severity of aortic stenosis is an important determinant of prognosis in patients with symptoms who do not undergo valve replacement. To assess the pitfalls of using valve gradients alone 636 patients with aortic stenosis in whom the aortic valve area had been calculated by the Gorlin formula were studied. The correlation between valve area and aortic gradients was poor. No gradient was foun...

Assessment of aortic valve stenosis severity: A new index based on the energy loss concept.

BACKGROUND Fluid energy loss across stenotic aortic valves is influenced by factors other than the valve effective orifice area (EOA). We propose a new index that will provide a more accurate estimate of this energy loss. METHODS AND RESULTS An experimental model was designed to measure EOA and energy loss in 2 fixed stenoses and 7 bioprosthetic valves for different flow rates and 2 different...