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Though there are several parameters for evaluation of left ventricular diastolic function by echocardiography, the most commonly used are the pulsed Doppler mitral E/A ratio and tissue Doppler mitral E/e’ ratio. Doppler interrogation of mitral valve is usually done from the apex through the apical four chamber view.
In usual syncope, there could be a fall in blood pressure, bradycardia, and there are various types, which will be described. The most common is mixed type, in which, in the tilted position, the person develops both bradycardia and hypotension and usually there is a syncope. Various types of responses can occur to head up tilt test.
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Bicuspid/Mitral 
52 
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