The Wiggers diagram represents simultaneous events of the cardiac cycle, with stacked graphs showing left atrial, left ventricular, and aortic pressures, heart sounds, left ventricular volume, and the electrocardiogram (ECG). It shows the pressure and volume changes within the heart chambers as well as the corresponding changes on an Electrocardiogram (ECG). The diagram uses the pressure and volume changes from the left side of the heart. The right side of the heart shows similar changes, but operates at lower pressures so the changes are not as pronounced. Therefore, for the purposes of illustration, the left side is used. The Wiggers diagram is well known as one of the most intimidating visual representations of physiological processes that students encounter in their studies.
Looking for help in understanding or explaining this complex concept? Check out this Hot Tip by Christie Jordan, BS, RDCS, RCS, RCIS, FASE, faculty for our Introduction to Adult Echocardiography training course, as she breaks down the Wiggers diagram in just over 3 minutes!
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