ECG: Heart Block

An ECG strip shows the presence of heart block, in which conduction of the heartbeat from the atria to the ventricles is delayed. Heart block may be indicated by a delay in the spikes that progressively increases. A normal ECG strip is shown at the bottom for comparison.

(From D Dubin, Rapid Interpretation of EKGs, 1996, Cover Inc., p. 95, 171; with permission.)