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Usurpation: Assumption of pacemaker function of the heart by a subsidiary focus as a result of its own increased automaticity; e.g., accelerated junctional pacemaker takes command when it exceeds the sinus rate. [L. usurpo, pp. -atus, to seize]
Source: Stedman's Medical Spellchecker, © 2006 Lippincott Williams & Wilkins. All rights reserved.
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