complete heart block

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complete heart block (CHB)

Etymology: L, complere, to fill up; Gk, kardia, heart; OFr, bloc
total failure of impulses to be conducted from the atria to the ventricles. It causes the atria and ventricles to beat independently. It requires the use of a pacemaker to maintain a normal heart rate. Also called third-degree AV heart block.

complete heart block

A condition in which there is a complete dissociation between atrial and ventricular systoles. Ventricles may beat from their own pacemakers at a rate of 30 to 40 beats per minute while atria beat independently. Synonym: third-degree heart block
See also: heart block

heart block

impairment of conduction in heart excitation; often applied specifically to atrioventricular heart block.
When isolated impulses from the atria fail to reach the ventricles, heartbeats are missed and the block is called incomplete. When no impulses reach the ventricles from the atria the heart block is complete, with the result that the atria and the ventricles beat at separate rates. In this case the beats remain regular but the rate of the ventricular beats is greatly slowed down.

atrioventricular (A-V) heart block
a form in which the blocking is at the atrioventricular junction. It is first degree when A-V conduction time is prolonged; second degree (partial heart block) when some but not all atrial impulses reach the ventricle; third degree (complete heart block) when no atrial impulses at all reach the ventricle, and the atria and ventricles act independently of each other.
bundle-branch heart block
a form in which one ventricle is excited before the other because of absence of conduction in one of the branches of the bundle of His.
complete heart block
see atrioventricular heart block (above).
fascicular heart block
one originating on one of the two divisions of the left bundle branch. See also hemiblock.
interventricular heart block
bundle-branch heart block.
Mobitz heart block b's
variations of second-degree heart blocks. See also wenckebach's phenomenon.
sinoatrial heart block
partial or complete impairment of conduction from the sinoatrial node to the atria, resulting in delay or absence of an atrial beat.
References in periodicals archive ?
Sinus of Valsalva Aneurysm: A Reversible Cause of Complete Heart Block.
An implantable synchronous pacemaker for the long term correction of complete heart block.
Glasgow University heart specialist Dr Andrew Rankin said: ``I have not seen the case notes but I don't think someone with complete heart block should have been driving a taxi, there is no debate about that.
Unfortunately that ended up with complete heart block and left sided brain infarct.
Over all complete heart block in the perimembranous ventricular septal defect after surgical closure was 10(9.
Early diagnosis means careful management for avoidance of complications like hypotension, Complete Heart Block etc.
An EKG demonstrated sinus rhythm with complete heart block, right bundle branch block, and left anterior fascicular block, as well as T wave abnormalities suggestive of possible ischemia (Figure 1).
When Ann was just 28 weeks pregnant she started having agonising pains in her chest and tests revealed their unborn son had congenital complete heart block and was unlikely to go full term.
The major cardiac complications documented were death, myocardial infarction, pulmonary oedema, ventricular fibrillation, complete heart block and cardiac arrest.
Complete heart block is thought to be a direct result of the antibodies on the developing myocardial conduction system in utero.
The most serious complications occur with cardiac involvement which includes arrhythmia, myocardial dysfunction and complete heart block.

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