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DOWNLOAD PDFIn aortic regurgitation, when the pressure of the left ventricle falls below the pressure in the aorta in diastole, the aortic valve cannot completely close causing regurgitant blood to flow back from the aorta into the left ventricle. Therefore, aortic regurgitation is characterized by a diastolic murmur.
The regurgitant blood flow from the aorta to the left ventricle causes a characteristic early high pitched diastolic murmur that can be appreciated on auscultation of the heart. The murmur is typically described as a decrescendo murmur, best heard in the third left intercostal space.
The murmur caused by aortic regurgitation is classically described as having a blowing quality.
The regurgitant flow results in a decrease in the diastolic blood pressure in the aorta and typically also causes an increase in the systolic blood pressure, leading to an increase in the pulse pressure (defined as systolic pressure minus diastolic pressure).
A water hammer pulse is a medical sign that describes a bounding and forceful pulse commonly associated with increased pulse pressures caused by aortic regurgitation.
Head bobbing, also called De Musset's sign, is a condition characterized by a rhythmic bobbing of the head that correlates to the beating of the heart. This condition is frequently associated with aortic regurgitation.
Widened pulse pressure can cause visible pulsations of the nail capillary beds, commonly called Quincke's sign, associated with aortic regurgitation.
Prolonged aortic regurgitation can lead to an Austin Flint murmur, which is a soft mid-diastolic rumble caused by regurgitant flow hitting the anterior mitral leaflet causing partial closure.
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