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Pronunciation: yū′sŭr-pā′shŭn
Definition: Assumption of pacemaker function of the heart by a subsidiary focus as a result of its own increased automaticity; accelerated junctional pacemaker takes command when it exceeds the sinus rate.
[L. usurpo, pp. -atus, to seize]
Examples: glitazone, GI cocktail, etc.
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