Question

What causes an S4 heart sound? 1 point A. Passive filling into a compliant left O ventricle causing sudden tensing of the chordae tendinae B. Active filling into a compliant left O ventricle causing sudden tensing of the chordae tendinae O C. Passive filling into a non-compliant left ventricle D. Active filling into a non-compliant left ventricle​

Answer 1

Answer:

The fourth heart sound (S4), when audible, is caused by vibration of the ventricular wall during atrial contraction. This sound is usually associated with a stiffened ventricle (low ventricular compliance), and therefore is heard in patients with ventricular hypertrophy, myocardial ischemia, or in older adults.

Explanation:

The fourth heart sound (S4), when audible, is caused by vibration of the ventricular wall during atrial contraction. This sound is usually associated with a stiffened ventricle (low ventricular compliance), and therefore is heard in patients with ventricular hypertrophy, myocardial ischemia, or in older adults.