Background: Clinical assessment of diastolic heart sounds is challenging. Hypothesis: We sought to examine whether visual inspection of acoustic cardiographic tracings augments the accuracy of medical students' and physicians' detection of third and fourth heart sounds (S 3 , S 4 ) compared to auscultation alone. Methods: A total of 90 adults referred for left heart catheterization underwent digital precordial heart sound recordings by computerized acoustic cardiography. Two blinded, experienced readers using a consensus method determined the presence of the S 3 /S 4 on each file. There were 35 subjects from the following 5 groups participating in this study from 1 teaching institution: first-year medical students (n = 5), fourth-year medical students (n = 5), interns (n = 5), medicine residents (n = 5), cardiology fellows (n = 5), and attendings (n = 10). Using a computer module, each subject listened to the heart sounds alone and documented whether an S 3 /S 4 was present. Next, subjects listened to each recording in random order while viewing phonocardiographic tracings, and recorded S 3 /S 4 presence. Results: An S 3 was present in 21 patients (23%) and an S 4 in 31 patients (34%) by consensus overread in 90 recordings. Baseline accuracy for auscultation of S 3 /S 4 did not change with level of experience. While viewing the acoustic cardiogram, first-year medical students had minimal improvement in S 3 (2%) and S 4 (11%) accuracy. More experienced subjects improved S 3 accuracy by 8% to 18% and S 4 by 15% to 32% (P < .05). Accuracy was superior for S 3 compared to S 4 in all ausculatory groups. Conclusions: While listening to heart sound recordings, viewing acoustic cardiography increased subjects' accuracy in detecting diastolic heart sounds, particularly among more experienced subjects. There was greater improvement for S 4 compared to S 3 detection.
BackgroundThe atrial and ventricular gallop was first described in the literature by Potain in 1880. 1 The low-pitched third heart sound (S 3 ) is known as the ventricular gallop, and occurs 0.12 to 0.16 seconds after the second heart sound in diastole. The S 3 is caused by the sudden deceleration of rapid diastolic filling into a distended or incompliant ventricle.2 The fourth