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Figure 5 Suppression of repetitive atrial tachycardia by intravenous lidocaine in the same patient as in Figure 4. A small dose of the drug caused a progressive abbreviation of the salvos and, finally, restoration of normal sinus node rhythm (S.R.). The suppression of the arrhythmia was not the result of an increment of the sinus node rate, which is slower (97 beats/min) than the critical atrial rate (109 beats/min) required to eliminate the arrhythmia in Figure 4B. HRA = high right atrium electrogram.
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