Atrial systole

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- is preceded by the P wave, which represents electrical activation of the atria.

- contributes to, but is not essential for, ventricular filling.

Time (sec)

Figure 3-15. The cardiac cycle. ECG = electrocardiogram; A = atrial systole; B = isovolumetric ventricular contraction; C = rapid ventricular ejection; D = reduced ventricular ejection; E = isovolumetric ventricular relaxation; F= rapid ventricular filling; G - reduced ventricular filling.

Time (sec)

Figure 3-15. The cardiac cycle. ECG = electrocardiogram; A = atrial systole; B = isovolumetric ventricular contraction; C = rapid ventricular ejection; D = reduced ventricular ejection; E = isovolumetric ventricular relaxation; F= rapid ventricular filling; G - reduced ventricular filling.

- The increase in atrial pressure (venous pressure) caused by atrial systole is the a wave on the venous pulse curve.

- Filling of the ventricle by atrial systole causes the fourth heart sound, which is not audible in normal adults.

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