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bidirectional ventricular tachycardia

(bī′dĭ-rĕkshə-nəl, -dī-)
n.
  1. Ventricular tachycardia in which the QRS complexes in the electrocardiogram are alternately positive and negative.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.