Heart Block

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heart block

[′härt ‚bläk]
The cardiac condition resulting from defective transmission of impulses from atrium to ventricle.

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.


References in periodicals archive ?
In some cases, however, congenital heart block occurs in affected fetuses, causing permanent heart damage and fetal death.
It should be suspected in children with congenital heart block as it is responsible for over 85% of cases.
Sauvignon Blanc from Gamble's Heart block repeatedly sparkles.
In the child with complete heart block, if inadequately perfused, CPR may be required.
Two hundred and ninety-five patients (68%) had complete heart block either alone or in association with sinoatrial disease.
In another study16 the significant RCA lesions was seen in 60% with heart block and ischemic heart disease.
Reasons for CPR were found to be VT (ventricular tachycardia), VF (ventricular fibrillation), asystole, heart block, cardiac and respiratory arrest (p=0.
Complete heart block is the most common finding in patients with clinically evident CS and is reported in up to 30 percent of patients.
Congenital complete heart block (CCHB) [2] is the complete electrical dissociation between atrial and ventricular electrical activity due to atrioventricular nodal dysfunction.
In complete heart block, damage to the heart's electrical conduct system prevents electrical impulses from the upper chambers (atria) getting to the lower chambers (ventricles), so that the ventricles cannot contract properly and pump blood round the body.
Little Grace Smith, three, was born with a congenital heart block and had an operation on Monday to get a pacemaker fitted.