Heart block.Causes and Prevention


The heart has a natural “pacemaker” called sinus or sinoatrial (SA) node. The SA node is a group of specialized cells located in the upper part of the right upper cavity of the heart (right atrium). The SA node sends electrical impulses through the heart, between 60 to 100 times per minute, to stimulate the heartbeat (contraction). When the SA node sends an electrical impulse, it first passes through the upper Chambers of the heart (the Atria), and then passed by a small group of cells called nodule atrioventricular (AV). The AV node stops the momentum and sends it via a driving called the bundle of His. The bundle of His divides into a right branch and a left branch leading to the lower cavities of the heart (the ventricles).

Causes of the Heart block?

So the left and right ventricles to contract at the same time, an electrical impulse by the branches should spread right and left of the bundle of His to the same speed. If there is a blockage in one of these branches, the electrical impulse must reach the ventricle by another way of driving. When this happens, the frequency and the rhythm of the heart are not affected, but the impulse spreads more slowly. The ventricle may contract but will take more time to do so due to the delay of the impulse. This delay of the impulse is that one of the ventricles to contract a fraction of second more slowly than the other.


In the majority of cases, the bundle branch block does not require any treatment. But patients who have a blockage of branch along with other cardiovascular disease may need treatment. For example, if a bundle branch block occurs during a heart attack, it might be necessary to implant a pacemaker. After a heart attack, the heart weakens and a bundle branch block could cause a too-slow heartbeat (bradycardia). The pacemaker helps regulate the heart rate after a heart attack.

A new type of stimulation called “cardiac resynchronization therapy” can be used on patients who have both a crash of rama as a dilated cardiomyopathy, (CRT). Normally, only one of the lower cavities of the heart (the ventricles) stimulate pacemakers at the same time. But the TRC returns to coordinate the two ventricles heartbeat by stimulating them at the same time. Recent studies have shown that the CRT is effective in certain patients who have both a bundle branch block and a dilated cardiomyopathy.

Doctors can use an electrocardiograph to record the electrical impulses of the heart. A bundle branch block will be shown on the ECG tracing. The layout of the electrical signal recorded by electrocardiograph can even indicate if the lock is in the left or right bundle branch.

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