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Heart Block

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Definition: Impaired conduction of cardiac impulse that can occur anywhere along the conduction pathway, such as between the SINOATRIAL NODE and the right atrium (SA block) or between atria and ventricles (AV block). Heart blocks can be classified by the duration, frequency, or completeness of conduction block. Reversibility depends on the degree of structural or functional defects.     
Examples Adams-Stokes Syndrome; Atrioventricular Block; Bundle-Branch Block; Sick Sinus Syndrome; Sinoatrial Block
Other names Auriculo-Ventricular Dissociation; Heart Blocks; Dissociations, Auriculo-Ventricular; Dissociation, Auriculo-Ventricular; Blocks, Heart; Block, Heart; Auriculo-Ventricular Dissociations; Auriculo Ventricular Dissociation
 
SubstanceCAS Registry & nameCategoriesSource
Hereditary bundle branch system defect  0   *Heart Block.
Congenital heart block  0   *Heart Block/congenital.

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Sources: NLM Medical Subject Headings, NIH UMLS, Drugs@FDA, FDA AERS original data copyright United States Government. No endorsement implied. Last modified 6/6/2012

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