A diagnostic clue that a patient may have ARVD/C is the presence of a late diastolic, low frequency gallop sound resulting from a forceful atrial contraction. This extra heart sound is also known as ___

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The fourth heart sound is a low-pitched sound coincident with late diastolic filling of the ventricle due to atrial contraction and is the result of vibrations generated within the ventricle. It can be detected occasionally by inspection, commonly by palpation and auscultation, and it can be depicted graphically by phonocardiographic recording. The evaluation of a fourth heart sound arising from the left ventricle is most readily carried out with the patient in the left lateral recumbent position. Inspection and palpation are employed first to identify the apex impulse, where the fourth heart sound is usually most prominent. The third heart sound (S3) is a low-frequency, brief vibration occurring in early diastole at the end of the rapid diastolic filling period of the right or left ventricle. Pericardial rub is mostly seen with pericarditis. Pericardial friction rubs are characterized by: One systolic sound and two diastolic sounds (3 component rub) (systolic sound between S1 and S2); One diastolic sound in early diastole and one at end diastole (2 component rub).

A Diagnostic Clue That a Patient May Have ARVD/C Is