R.S.WINTER / SCIENCE PHOTO LIBRARY R.S.WINTER / SCIENCE PHOTO LIBRARY
Normal heart trace on female figure. Illustration of an electrocardiograph (ECG) readout showing two normal heartbeats superimposed on an abstract female figure. The yellow heart trace measures the normal pumping of the heart as a series of small and larger waves. These waves correspond to the electrical activity of the heart muscle, first during atrial (upper chamber) contraction and then ventricular (lower chamber) contraction. An ECG heart trace is an important means of diagnosing diseases of the heart such as coronary artery disease, pericarditis, coronary thrombosis and arrhythmias.
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