left parasternal impulses

left parasternal impulses
cardiac impulses categorized according to their location along the upper, mid, or lower left sternal border. An upper left parasternal impulse is usually caused by a systolic expansion of a dilated pulmonary artery; a mid to lower left parasternal impulse usually occurs as a result of a right ventricular contraction, and is characterized by an outward movement beginning synchronously with the first heart sound, but is sometimes caused by mitral incompetence.

Medical dictionary. 2011.

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