Pressures and volumes in cardiac cycle
behold, the Wiggers diagram
these are the passmed numbers
- Cardiac output in an average male at rest is approx ~ 5 litres/min
- Stroke volume is approx 70 mls in an average male
events
isovolumetric contraction
- mitral valve closed
- aortic valve closed --> open
- corresponds to c wave of CVP waveform
- corresponds to QRS complex
- 1st heart sound
isovolumetric relaxation
- aortic valve closed
- mitral valve closed → open
- 2nd heart sound
- v wave of CVP waveform?
pressures
| Site | Typical blood pressure (mmHg) |
|---|---|
| Left ventricle | 120 |
| Start of arterioles | 65 |
| Arterial side (start) of capillaries | 25 |
| Venous side (end) of capillaries | 15 |
| Vena cava at level of heart | close to zero (2-8) |
related topics
sidenote on The arterial waveform