376
Chapter 12
Aortic pressure
Left ventricular pressure
Left ventricular volume
Phase of cardiac cycle
ECG
Heart sounds
Left atrial pressure
Diastole
Diastole
Systole
1
4
3
2
1
1 = Ventricular filling
2 = Isovolumetric ventricular contraction
3 = Ventricular ejection
4 = Isovolumetric ventricular relaxation
End-
systolic
volume
End-diastolic
volume
130
65
0
50
110
QRS
PT
1st
2nd
Pressure (mmHg)
Left ventricular volume (ml)
17
6
10
16
5
8
9
28
25
11
4
14
18
22
21
19
2
3
12
13
15
23
24
26
7
1
20
27
Figure 12–19
Summary of events in the left atrium, left ventricle, and aorta during the cardiac cycle (sometimes called the “Wiggers” diagram). See text for a
description of the numbered steps.
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