A cardiac murmur is an abnormal cardiac sound. Which item is false in regard to

Question

A cardiac murmur is an abnormal cardiac sound. Which item is false in regard to heart sounds?

A. there should be only 2 cardiac sounds: first heart sound ("lub") and second heart sound ("dub")

B. nornal heart sounds are related to the closure of the heart valves: simultaneous closure of the right and left A-V valves produces the first heart sound, and simultaneous closure of the aortic and pulmonary valves produces the second heart sound

C. most cardiac murmurs are caused by insufficient valves that do not close properly (ie, do not form blod-tight seals) or bystenotic valves that do not open all the way

D. non-valvular causes of cardiac murmurs include interventricular septal defect, patent ductus arteriosus, and severe anemia

E. if all of the above are true, choose this response

Explanation / Answer

ANSWER- option A- is FALSE- no there should be not only two type of heart sound but they are four type S1,S2,S3,S4

S3- present in some individually normally,

-produced by oscillating blood in already filled ventricles in back and forth producing wall tension and sound S3, this sound is not valvular origin,

in a filled heart in the last part of ventricular origin occur during atrial contraction after ventricular diastolic phase in a filled heart in the last part of ventricular filling

S4-when blood from atria is forced in the stiff and hypertrophied ventricle it produce s4 sound its pathological origin

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