Phonocardiogram of aortic regurgitation as heard at the second right intercostal space

Carotid artery pulse tracing and phonocardiogram of aortic regurgitation as heard at the second right intercostal space. S1 (mitral and tricuspid valve closure) is followed by a systolic ejection murmur due to the large stroke volume seen in aortic regurgitation. After S2 (aortic and pulmonic valve closure), there is a faint and short diastolic "blowing" murmur of aortic regurgitation.