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 The cardiac cycle can be described as a period of ventricular contraction (systole) followed by ventricular relaxation (diastole).

 The electrical, mechanical and audible events that occur during the cardiac cycle are depicted in the Wigger's diagram (see Figure 3.1) and described below.

Figure 3.1 The Wigger's diagram depicts the electrical, mechanical and audible events of the cardiac cycle. SLV, semilunar valve; MV, mitral valve; a, atrial contraction; c, tricuspid bulge; v, atrial filling.