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13 Cards in this Set
- Front
- Back
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Diastole
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Ventricular filling (~.5s)
Atrial systole is a part of ventricular diastole |
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Systole
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ventricular ejection (~.3s)
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Total Cardiac cycle
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~.8s
1.2beats/minute = ~70 beats /min |
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Isovolumetric ventricular contraction (systole)
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Systole
AV valve - closed Aortic and pulmonary valves are closed Ventricle contracts Aorta relaxed |
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Ventricular Ejection (diastole)
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Systole
AV Valve - closed Aortic and pulmonary valves open Ventricular contraction Aortic relaxation |
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Isovolumetric Ventricular Relaxation (Diastole)
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Both valves closed
Ventricle relaxed Atrium relaxed |
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Ventricular Filling
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AV valve open
Aortic and pulmonary valves closed Ventricle relaxed Atrium goes from relaxed to contracted |
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Ejection Fraction
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Ejection Fraction = SV/EDV
SV = EDV - ESV ** only about 1/2 of EDV is ejected |
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Right Heart vs. Left heart
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Right Left
pulmonary systemic low P high P low R high R less muscle more muscle |
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Why does aortic pulse pressure not return to near zero during diastole?
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1. Aorta is compliant, blows up like a balloon, can't immediately drain into blood circulation
2. Aortic distension attenuates pressure pulse 3. Aorta is resevoir for continuous blood flow |
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MAP
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Time averaged value of the pressure trace
MAP = DP + 1/3PP Increases w/ age b/c of decreased elasticity |
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Systemic vs. Pulmonary BP
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120/70 mmHg
24/8 mmHg |
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How is Cardiac Output Measured?
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1. Oxygen consumption in lungs
2. Oxygen transport in the blood 3. Thermodilution method 4. Echo Cardiography 5. Laser Doppler monitor/imager |
