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Figure 34-28
Computerized template of the underlying normal QRS complex
(X) and an ectopic complex called a test beat (Y). Beat Y is matched to beat X by
the computer during the region of comparison by cross-correlation algorithms. (Adapted
from Morganroth J: Ambulatory Holter electrocardiography: Choice of technique and
clinical uses. Ann Intern Med 102:73, 1985.)
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