Flying h4x0r
Forum Junior
Topics: 4
Posts: 51
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S1 is the closing of the bicuspid and tricuspid valves at the onset of systole
S2 is the closing of the aortic and pulmonic valves at the end of systole.
S3 is a the sound of passive ventricular filling, it is a normal finding in children, but may be a sign of heart failure in elder adults
S4 is the sound of active ventricular filling, as the atria are contracting, at the end of diastole. It always pathological (right?)
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| KEROCHI
Forum Guru
Topics: 60
Posts: 971
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Vgood!
Now.. what about wide split & paradoxical split of S2.
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| mildus
Forum Guru
Topics: 19
Posts: 614
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S2 can normally split because aortic and pulmonic valve don't close in the same time because of the different pressures in aorta and pulmonary truncus
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| ssrpk
Forum Fanatic
Topics: 154
Posts: 2,814
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Paradoxical split of S2: P2 closes earlier than A2 during expiration, either due to delayed closure of AV valve or ealry closure of pulmonic; mostly occurs in post-MI cases following left bundle branch block!
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life is guud
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| KEROCHI
Forum Guru
Topics: 60
Posts: 971
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Thanks guys...
Wide split of S2- asynchrony in semilunar valve closure.
seen in: ASD, Pulm. stenosis , RBBB, RV overload(i.e. massive Pulm. embolism or Pulm. stenosis)
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| twinkle
Forum Senior
Topics: 5
Posts: 44
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in ASD wide and fixed splitting ( Fixed=doesn`t change with respiration)
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| Cedrick
Forum Fanatic
Topics: 320
Posts: 1,928
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sweet
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