Last updated:10-15-2008
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Definition and causes

Cardiac contraction is controlled by a specific type of heart cells, calledpacemaker cells. They have something quite unique in the body the ability to deliver electrical impulses in a regular rhythm, which can be adjusted up and down according to need (eg. By physical exertion or sleep).


Sinusknuden, Who sits in the heart pre right, is a collection of these pacemaker cells, which give the overall electrical impulse. The impulse to run in special lanes tap into the rest of the heart through forkammerknuden (also calledatrioventrikulærknudenorAV Gordian knot), Which sits between forkamrene and lengthwise. This draws the heart muscle itself together current and pumps blood forward into the system.


These wire lanes have been constructed in a way that momentum is spreading out of the heart chambers with different delay. This means that each chamber drawn together in the order that is optimal to pump blood efficiently through the heart (see alsoheart rhythm regulationandheart valves).


Sick Sinus Syndrome

This syndrome has sinusknuden difficult to maintain overall control of heart rate, often due to age-related wear of the pacemaker cells. There is alternately normal heart rhythm and slow heart rate, possibly. with episodes of rapid heart beat and briefly cardiac arrest, which may result in fainting.


AV block

In this mode, the momentum going through the AV Gordian knot inconvenience or prevented, often due to age-related changes, after amyocardial infarctionor due to medication overdose. The electrical impulse from sinusknuden has so difficult to move forward with lengthwise, and the heart contractions become less coordinated. Depending on how much momentum is blocked, divides the state Monday in the 1st, 2nd and 3rd degree AV block.


By 1st degree AV block is stimulated only slightly delayed, but there is usually full coordination between the contraction of forkamre and heart chambers. By 2nd degree AV block the delay is so great that there are occasional lack of heart attack. By 3rd degree AV block is a total blockage of impulses between pre and lengthwise. But fortunately lengthwise have the ability to independently to pull together without overall management of sinusknuden. There is no coordination between forkamrenes and h


Symptoms of heart block and sick sinus syndrome

The symptoms of AV block depends on the degree of delay, and both lengthwise ability to independently to pull together no overall control. By 1st degree AV block, and mild forms of 2nd degree AV block, is the only symptom usually only dizziness, but at the more severe forms of 2nd degree AV block and 3 degree AV block seen fainting, convulsions or at worst, cardiac arrest.


The so-calledAdam-Stokes syndromeare characterized by completely unannounced syncope, which is fully awake and ready immediately after the attack (seen particularly by the more severe degrees of AV block). The syndrome is seen as a result of very slow heart rate or short-term cardiac arrest, leading to insufficient blood supply to the brain.


When sick sinus syndrome symptoms are palpitations, dizziness and fainting, possibly. in the form of Adam-Stokes syndrome.



The above symptoms may give suspected heart block or sick sinus syndrome. The diagnosis made by definitively that the doctor takes out a electrocardiogram (ECG)measuring cardiac electrical impulses.


Treatment of heart block and sick sinus syndrome

By 1st degree AV block, and mild forms of 2nd degree AV block, it is often enough to wait for the situation, possibly. with monitoring of heart rhythm in a period.


In the more advanced forms of AV block Monday usually brings apacemaker.


When sick sinus syndrome, it can also become an issue with a pacemaker, but it all depends on how serious the condition is, and how severe the symptoms are.






Related articles:

Cardiac arrest (Institio cordis)
Extra Stroke (extra heartbeat, extrasystoles)
Forkammerflimmer and flutter (Atrieflimmer and atrial flutter)
Heart Block (1st, 2nd and 3rd degree AV block) and Sick Sinus Syndrome (SSS)
Heart rhythm regulation
Racing heartbeat (Paroxystisk supraventricular tachycardia)



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