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 ?
Complete heart block is usually suspected if you have a very slow heartbeat and is confirmed by electrocardiography (ECG).
As the tumor invaded the heart, a number of cardiac complications occurred, including new-onset atrial fibrillation, malignant pericardial effusion with tamponade physiology, first-degree heart block, and complete heart block.
Shock may be a presenting feature but it generally develops within the first few days with malignant arrhythmias such as complete heart block or ventricular tachycardia as possible precipitating causes.
6) In our patient, there was no sign of complete heart block in the fetus throughout the entire hospital stay.
Because of this complete heart block condition, the patient is now dependent on the Kappa 900 pacemaker to maintain an adequate heart rate.
Spain and Cathcart (4) described a 59-year-old woman with complete heart block who at necropsy had "almost the entire myocardium [in the upper third of the ventricular septum] .
Asystole may be due to profound suppression of both atrial and ventricular activity, complete heart block and prolonged myocardial ischemia (1).
resulted in the first wearable pacemaker for the successful treatment of patients with chronic complete heart block.
Electrocautery Mode for management of patients during surgery with intermittent or complete heart block.
The presence of bifascicular block and worsening AV block with increasing heart rates should raise the suspicion of infranodal Wenckebach with the attendant risk of progression to complete heart block.
Detrimental ventricular remodeling in patients with congenital complete heart block and chronic right ventricular apical pacing.

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