Heart Block

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heart block

[′härt ‚bläk]
The cardiac condition resulting from defective transmission of impulses from atrium to ventricle.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Heart Block


disruption of the conductivity of the nerve impulse along the conductive system of the heart. Types of heart blocks—intra-auricular (sinoauricular) blocks, au-riculoventricular (atrioventricular) blocks, and blocks of the peduncles of the bundle of His and of the terminal branches—are distinguished depending on the site of the disruption. Heart block may be caused by organic diseases of the myocardium (rheumocarditis, coronary cardiosclerosis), more rarely by intoxications, and also by functional disturbances of the nervous system (neuroses). It may be temporary or permanent, complete or partial. Bradycardia (slowing of the pulse to 18–10 beats per minute) is noted in cases of complete heart block; this leads to severe anemia of the brain accompanied by dizziness, loss of consciousness, and sometimes convulsions. Treatment is directed at eliminating the causes of the heart block.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
With an increasing number of case reports, testing for anti-Ro antibodies should be considered in patients with complete heart block, where structural, biochemical, and electrophysiological causes have been excluded, even in the absence of an established connective tissue disorder.
Caption: Figure 1: EKG showing complete heart block with T wave inversion in inferiolateral leads and LVH strain.
Rauoof et al., "Thyrotoxicosis presenting with complete heart block," Saudi Medical Journal, vol.
Current Dilemma in Clinical Management of Autoantibody-mediated Congenital Heart Block
Monozygotic twins discordant for congenital complete heart block. Arthritis Rheum 1997;40:381-4.
Finally, the sequential ECG recordings revealed a few important markers like Heart Block (Chi sq 13.652, p <0.001) and absent P waves (Chi sq 24.26, p <0.001) predicting death.
The peak onset for diagnosis of congenital heart block in utero is between the 18th and 24th weeks of gestation.
Varying degree of conduction abnormalities ranging from transient first degree atrio-ventricular block to higher degree atrio-ventricular block including complete heart block has been noted.
Of these 30-40% are complete atrioventricular septal defects (AVSD)[4,5,6] The isolated 3rd degree or complete heart block with or without CHD is a rare finding in Down cases.
The highest tested concentration (100 [micro]M BPA) produced complete heart block.
The 41-year-old had her device fitted in 2011 after being diagnosed with heart block, which causes the heart to beat too slowly.