Abstract
The so-called “supernormal” phase is that portion of the recovery period of excitable cells during which a subthreshold stimulus may elicit a propagated response (ie, supernormality of excitability), or during which conduction of an oncoming impulse is facilitated to a greater degree than if it arrived earlier or later in the recovery cycle (ie, supernormality of conductivity). First described in nerves by Adrian and Lucas1 in 1912, supernormality was demonstrated in cardiac tissue by Adrian2 in 1920.
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