General Cardiology Part 4
Question 25/36
Compare and contrast the third heart sound and the fourth heart sound (give at least 5 differences and two similarities).
Question 25/36
Compare and contrast the third heart sound and the fourth heart sound (give at least 5 differences and two similarities).
S3 – “ventricular gallop”
- Occurs in early diastole
- Occurs during passive LV filling
- May be normal at times
- Requires a very compliant LV
- Can be a sign of systolic CHF
S4 – “atrial gallop”
- Occurs in late diastole
- Occurs during active LV filling
- Almost always abnormal
- Requires a non-compliant LV
- Can be a sign of diastolic CHF