JOHN BAVOSI / SCIENCE PHOTO LIBRARY JOHN BAVOSI / SCIENCE PHOTO LIBRARY
Cardiac arrhythmia. Artwork of a human heart with electrocardiogram (ECG) traces showing cardiac arrhythmia - abnormal rhythm or rate of the heart- beat. Highlighted in colour on the heart are the sinoatrial node (green), atrioventricular node (orange), and bundle of His (red). Together, these conduct the electrical signals across the muscles of the heart that stimulate contraction. Cardiac arrhythmia is caused by disturbance of these impulses, and usually results from disease or drug overdose. Different types of arrhythmia produce different ECG traces, where the electrical impulse is monitored and displayed on a screen. The traces allow accurate diagnosis.
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