Overview of an atrostricular node (AV node)


узел ATRIOVENTRICULAR (AV) -This is the key part of the electric heap system , controlling the transmission of electrical pulses of hearts from the end of the rejection ventricles, the small structure is strategically near the center of the heart.Where are very close.

Violations Av can lead to the fact that AR Arrhytmias , in which the heart can be too slow (bradycardia), or too fast (tachycardia).As a bradycardia, or tachycardia can produce significant symptoms.

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What is the AV node?

AV node -This is a small button ‘button’ specialized cells (approximately 3 for 5 millimeters in diameter), located next to the center of the heart. It is on the right side of the atrial partition in the connection of the ATRI and the ventricles. / P>

Your task is to help coordinate the reduction of atri and ventricles in response to the electrical signal From the heart.

What does an AV node do?

AV node Controls the passage of the electrical signal of the hearts of Atria to the ventricles.

After generating an electrical pulse by the sinus node (located at the top of the right headset), it extends throughout the attraction, which forces the cameras to overcome.The AV node then ‘collects’, this electric impulse and, after a brief delay, allows you to go through the ventricles.

This brief delay in the transmission of an electrical signal through the AV node is crucial for the normal heartbeat and the effective functioning of the heart.

Clinical value

Without this brief delay in the electric impulse, Atry will not be able to finish the beating of the ventricles to fully pour the blood in front of the ventricles themselves.

Unlike other parts of the electric heart system, more often the AV node is stimulated by electrical pulses, the slower carries out electricity.

This object, which is called decreasing queries.The selected conductivity prevents most of these pulses to reach the ventricles and retain the dangerously increased heart rate.

Some people are born with two different electric roads through the AV node, which can make them propose to the arrhythmia, called Av nodal Restrant Tachycardia (AVNRT) .

AV disease can cause a delay or a partial or complete unit in the transmission of electric pulses from the ventricle attraction, the condition known as the unit of the heart .

The delay in conductivity through the AV node is considered in ECG in the form of an increase in the PR interval. (The PR interval measures the time between the reduction of the atria and the reduction of the ventricle.)

The long-term PR range created by delay in Nodular AV conductivity is called the first-degree AV unit. In general, this does not cause any symptoms or requires a certain treatment.

With a second grade AV drive, some impulses of the attraction are blocked from reaching the ventricles. With the third grade AV unit, all impulses are blocked.

Heart unit caused by a problem with the AV node is often associated with medications (such as beta blockers or Calcium channel blockers ), or for medical problems that increase vagal nerve tone (for example,Sleep apnea). When these basic conditions appeal, the resulting AV unit can disappear independently without the need for a permanent pacemaker.

Occasionally, the Nodal block of AV is important enough to create a serious bradycardia and insert the A> the pacemaker being required.

A general cause of the AV nodal block is likely to be required by a permanent cardimulator, namely, namely, myocardial infarction (heart attack) .AV node receives its blood supply in the AV assembly artery; In 90% of the people of this artery, branches of the right coronary artery .Therefore, the NODAL AV bloc due to the heart attack is considered more frequently with the correct heart attacks of the coronary artery.

Fortunately, even in these cases, the AV node is generally restored enough for several days to make a constant pacemaker unnecessary.

Word of the Meds information received

AV node is a very important part of the electric heart system.It transmits electrical signals from the heart of the atrium to the ventricle that optimizes the coordination of each heart, and if the blinking of the atrium occurs, it protects the bombing ventricles with a dangerous number of electrical signals.Violations of the AV node can produce tachycardia or bradycardia.

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