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Clarifies interectopic interval and ectopic cycle length in parasystolic VT; extends 1953 framework but leaves clinical standardization open.
An interectopic interval is the interval between two ectopic beats containing intervening sinus beats. The ectopic cycle length is the interval between two con- secutive ectopic beats, i.e. with no intervening sinus beats (Scherf and Schott, I953).
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Roelandt et al. (1971) studied this question.
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