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To the Editor:—
The interpretation of Master's two-step electrocardiogram tracings may be expedited by recording all four tracings on one strip of paper.The stylus of the electrocardiograph machine, is set to record as close as possible to the bottom edge of the paper and record the resting tracing. Opening the machine, the paper is manually wound back onto the feed roll. The stylus is then positioned above the first tracing, the patient performs the prescribed exercise, and the one-minute tracing is recorded. The same number of cycles or the same length of paper as the resting tracing are used for each lead. The paper is again wound backwards onto the feed roll and the three-minute tracing is recorded above the previous one, the rerolling is repeated, and the eightminute tracing is recorded above the previous (Figure). The first tracing can be positioned at the top of the paper, and
Rosenstiel HC. Recording Master's Two-Step Test Electrocardiograms. JAMA. 1968;203(11):990. doi:10.1001/jama.1968.03140110082027