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Atrioventricular – Meaning, AV Node and Disorders

Atrioventricular refers to the connection between the atria and ventricles of the heart. It is a key concept in understanding cardiac conduction and heart-related conditions.

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Things worth knowing about "Atrioventricular"

Atrioventricular refers to the connection between the atria and ventricles of the heart. It is a key concept in understanding cardiac conduction and heart-related conditions.

What Does Atrioventricular Mean?

Atrioventricular is a medical term that describes the anatomical and functional connection between the atria (upper chambers) and the ventricles (lower chambers) of the heart. The word is derived from the Latin atrium (entrance chamber) and ventriculus (small belly or chamber). This connection plays a critical role in the coordinated pumping action of the heart.

Anatomy and Function

The heart consists of four chambers: the right and left atria and the right and left ventricles. Between the atria and ventricles lie the atrioventricular valves:

Mitral valve (between the left atrium and left ventricle)
Tricuspid valve (between the right atrium and right ventricle)

These valves open and close rhythmically to ensure one-directional blood flow and prevent backflow.

The Atrioventricular Conduction System

Electrical impulses that trigger the heartbeat travel through the cardiac conduction system. A central component is the atrioventricular node (AV node), located at the boundary between the atria and ventricles. It briefly delays the electrical impulse to allow the atria to fully pump blood into the ventricles before the ventricles contract.

Functions of the AV Node

Transmission of electrical signals from the atria to the ventricles
Timed delay of the impulse for coordinated cardiac action
Protective function during excessively fast atrial rates (e.g., in atrial fibrillation)

Clinical Relevance: Atrioventricular Disorders

Disturbances in the atrioventricular region can lead to various cardiac conditions:

AV Block

An AV block refers to a delay or complete interruption of impulse conduction from the atria to the ventricles. Three degrees of severity are distinguished:

First-degree AV block: Prolonged conduction, usually without symptoms
Second-degree AV block: Intermittent blocking of individual impulses
Third-degree AV block (complete heart block): Full interruption; atria and ventricles beat independently of each other

AV Valve Disorders

Diseases of the mitral or tricuspid valve, such as stenosis (narrowing) or regurgitation (leaking), impair blood flow between atrium and ventricle and can lead to heart failure.

AV Nodal Reentrant Tachycardia (AVNRT)

In this common form of cardiac arrhythmia, the electrical impulse circulates within the AV node region, causing a sudden onset of rapid heartbeat.

Diagnosis

Atrioventricular disorders are primarily diagnosed using the following tests:

Electrocardiogram (ECG): Records the electrical activity of the heart; reveals blocks and arrhythmias
Echocardiography: Ultrasound examination to assess heart valves and cardiac function
Holter monitor (ambulatory ECG): Records heart rhythm over 24 to 48 hours
Electrophysiology study (EPS): Invasive measurement of the cardiac conduction system

Treatment

Treatment of atrioventricular disorders depends on the type and severity of the condition:

Medications: Antiarrhythmics, beta-blockers, or other cardiac drugs to regulate rhythm
Pacemaker: Often implanted in cases of high-degree AV block
Catheter ablation: Targeted destruction of abnormal conduction pathways in tachycardias such as AVNRT
Valve surgery: Repair or replacement of defective AV valves in severe cases

References

Zipes, D.P. et al. - Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine. 12th edition, Elsevier, 2022.
Kusumoto, F.M. et al. - 2018 ACC/AHA/HRS Guideline on the Evaluation and Management of Patients with Bradycardia and Cardiac Conduction Delay. Journal of the American College of Cardiology, 2019.
World Health Organization (WHO) - Cardiovascular Diseases Fact Sheet. Available at: https://www.who.int (accessed 2023).

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