The arrhythmias - bradycardia

Bradycardia can arise from two basic mechanisms. Very first, decreased automaticity of the sinus node in slow heart rates or lead break. When sinus node pacemaker activity ceases, the heart usually at a slower rate of other cardiac tissues with pacemaker action will be activated.

Decreased sinus node automaticity can occur in periods of increased vagal tone (sleep, carotid sinus massage, "common faint"), increase with age and secondary drugs(Beta blockers, calcium antagonists). 2nd slow heart rates can occur when the heart is prevented from activating the ventricles is usually due to blocked line.

Simply because the fibrous valvular annulus is electrically inert, the AV node and His bundle are usually the only electrically active connection between the atria and the chambers as well. Although this scheme is to prevent feedback between the two chambers useful, it also makes the AV node and itsBundle vulnerable to websites blocked heat conduction between the atria and ventricles.

Although preventing could possibly be observed in the left or right leg, not necessarily happen bradycardia, however, because the ventricles can be activated by the contralateral bundle. Atrioventricular has been classified as first degree to avoid, if an unusually long time, atrioventricular conduction (PR interval> 0.22 s), but the activation of the atria and ventriclesStill shows 1:1 association.

In second-degree AV block, some but not all atrial impulses conducted to the ventricles. Finally, block, third degree, there is no association between atrial fibrillation and ventricular action. can prevent Atrioventricular occur with age, with increased vagal input, and as a side effect of drugs in particular.

AV block can be observed occasionally in congenital diseases such as muscular dystrophy,Tuberous sclerosis and maternal systemic lupus erythematosus and acquired neurological diseases such as sarcoidosis, gout, Lyme disease, systemic lupus erythematosus, ankylosing spondylitis, and coronary artery disease. bradycardia may be reduced due to automatic or impeded heat transfer calls for the assessment to identify reversible causes.

However, implantation of permanent pacemaker is often required.

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