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16 Cards in this Set
- Front
- Back
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S1 is heard
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At the beginning of systole
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What makes S1?
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When intraventricular pressure exceeds atrial pressure so the av valves close (tricuspid/mitral)
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What heartphase occurs after S1?
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Systole - ventricular contraction
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What happens to end systole?
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When the pressure in the aorta and pulmonary vessels exceed that in the heart, they make the semilunar valves snap shut.
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What is S2?
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The sound of the aortic and pulmonary valves snapping shut
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What are the 2 valves that make up S1?
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-Mitral
-Bicuspid |
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What are the 2 valves that make up S2?
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-Aortic
-Pulmonary |
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What valve shuts first during S1? Why?
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The mitral valve - because pressure is so much higher on the left side of the heart.
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What valve shuts first during S2? Why?
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The Aortic. Because aortic pressure is much higher than pulmonary at the start of diastole.
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What takes longer, diastole or systole?
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Diastole - it is 2X longer
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When auscultating how can you determine what is S1 versus S2?
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Feel the pulse - when the pulse and heartbeat coincide, that is S1
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When is a murmur heard?
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During normally quiet diastole or systole
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What should be noted first about a murmur?
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-Where it is heard best
-Where it radiates to |
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What does inspiration do to the normal heartbeat?
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Splits the S2
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How do you know if a split S2 is nonpathologic?
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It goes away with expiration
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What would you suspect if there was a fixed split S2?
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Atrial septal defect
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