LBBB
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Related to LBBB: Left bundle branch block
LBBB
Left bundle-branch blockMcGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
bundle branch block
,BBB
A defect in the electrical conduction system of the heart in which there is failure of conduction down one of the main branches of the bundle of His. On the surface electrocardiogram, the QRS complex is > 0.12 sec. and its shape is altered. Synonym: bundle branch heart block; interventricularheart block
left bundle branch block
Abbreviation: LBBBA defect in the conduction system of the heart in which electrical conduction down the left bundle branch is delayed. On the 12-lead EKG, it gives the QRS complex a widened QS complex in lead V1 (0.12 sec.).
right bundle branch block
Abbreviation: RBBBA defect in the conductive system of the heart in which electrical conduction down the right bundle branch is delayed. On the 12-lead EKG, it gives the widened QRS complex an RSR appearance in leads V1 and V2.
left bundle branch block
Abbreviation: LBBBA defect in the conduction system of the heart in which electrical conduction down the left bundle branch is delayed. On the 12-lead EKG, it gives the QRS complex a widened QS complex in lead V1 (0.12 sec.).
See also: bundle branch block
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