heart sounds Flashcards
diastole
ventricular relaxation
2 phases of diastole
passive filling, active filling
passive filling
just ventricular relaxation
active filling
atrial contraction
all valves open
passively
moderator band
ensures coordinated contraction of all three papillary muscles in the right ventricle
when does the heart itself perfuse?
during the diastolic phase of the cardiac cycle
S1 Lub
closure of AV valves, louder, longer, lower
S2 Dub
closure of semilunar valves, short, high pitched
S3 lub-dub-ta
ventricular filling, disappears with age
S4 ta-lub-dub
atrial contraction, rare
sound in heart
carried in the direction of blood flow
stenosis
normal direction of blood flow through narrowed orifice
regurgitation
retrograde flow due to inadequate valve closure
systolic murmurs
aortic stenosis and mitral regurgitation
diastolic murmurs
aortic regurgitation (early) and mitral stenosis (late)
aortic stenosis
louder of 2 systolic murmurs, heard in R 2nd intercostal space
mitral regurgitation
heard in left 3rd intercostal space
aortic regurgitation
heard in left 3rd intercostal space
mitral stenosis
heard in left 5th intercostal space, midclavicular line
patent ductus arteriosus
continuous sound, heard in the left 2nd intercostal space
