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This picture shows an ECG (electrocardiogram, EKG) of a person with an abnormal rhythm (arrhythmia) called an atrioventricular (AV) block. P waves show that the top of the heart received electrical activity. P waves are usually followed by the tall (QRS) waves. QRS waves reflect the electrical activity that causes the heart to contract. When a P wave is present and not followed by QRS wave (and heart contraction), there is an atrioventricular block, and a very slow pulse (bradycardia). (Courtesy of the Centers for Disease Control.)
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