Phys2 Cardiac cycle
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show | 1.Isovolumetric contraction.
2.Rapid Ejection.
3.Reduced Ejection.
**All of this is occuring during Phase 2 of the ventricular AP.
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show | 1.Isovolumetric relaxation.
2.Rapid ventricular filling.
3.Reduced ventricular filling.
4.Atrial Systole (Pwave).
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What determines whether or not a heart valve is open or closed? | show 🗑
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show | 1A:Rapid inflow & diastasis.
1B:Atrial systole (P-R interval).
2:Isovolumetric contraction (QRS).
3:Rapid ejection.
4:Isovolumetric relaxation.
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what wave represents Atrial systole (phase 1b of cardiac cycle)? how long does it take? does it contribute to the LV volume? | show 🗑
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show | NO VALVE CHANGE!! the MAP is falling down closer to 80mmHg.
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show | 1.Valves: Mitral valve closes (initiates).
2.Pressure:rises from 15 to 80mmHg.
3.Volume:No change (EDV, flatline MAX on graph).
4.Sounds:S1 (mitral valve closing).
5.Atrial wave:C wave (mitral valve push into atria).
6.Time:0.05sec.
7.ECG:end of QRS
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Rapid & Reduced Ejection (phase 3 of cardiac cycle) | show 🗑
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show | MIDDLE
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show | Half way through the Ejection phase (3)
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show | 1.Valves:Aortic semilunar closes (mitral valve remains closed).
2.Pressure:Drops from 100 to 0mmHg.
3.Volume:No change (ESV, flatline MINIMUM).
4.Sounds:S2 (aortic closes).
5.Atrial wave:none.
6.Time:0.08s.
7.ECG:T wave
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When does Isovolumetric relaxation (phase 4) and passive ventricular filling (phase 1a) begin? | show 🗑
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show | The SLAMMING SHUT of the aortic semilunar valve.
The elastic energy absorbed by the smooth muscle artery stretch during PEAK systolic pressure is used to maintain pressure
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show | 1.Valves:mitral valve opens (initiates).
2.Pressure:minimal changes.
3.Volume:Rises from ESV almost to EDV.
4.Sounds:S3.
5.Atrial wave: none.
6.Time:0.5s.
7.T-P segment.
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How are the pressure changes in the R heart compared to the L heart? | show 🗑
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show | NO.
Low HR (60bpm): Diastole is 2X longer.
High HR (180bpm): Diastole is 1/2 systole (which will decrease EDV)
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show | 0.35 seconds. (0.3sec is phase 3)
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show | 0.73 seconds (0.5sec is phase 1a)
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