Ventricular rhythm is a heart rhythm originating in the ventricles, the lower chambers of the heart. This rhythm typically occurs during complete heart block (third-degree AV block), where electrical signals from the atria (upper chambers) do not reach the ventricles. It's important to note that ventricular rhythm is often unreliable and can stop abruptly.
Characteristics of Ventricular Rhythm:
- Origin: Ventricles of the heart.
- Occurrence: Commonly associated with third-degree AV block (complete heart block).
- Reliability: Often unreliable and can cease functioning.
- Accelerated Ventricular Rhythm (Idioventricular Rhythm): A specific type with a rate of 60–100 beats per minute.
Ventricular Rhythm in the Context of Heart Block:
In a normal heart, electrical impulses travel from the atria to the ventricles, coordinating heart contractions. However, in complete heart block, this pathway is blocked. The ventricles, in an attempt to maintain circulation, generate their own rhythm. This ventricular rhythm is generally slower than a normal heart rate.
Accelerated Ventricular Rhythm (Idioventricular Rhythm):
Also known as idioventricular rhythm, this is a type of ventricular rhythm that is faster, with a rate between 60 and 100 beats per minute. Although faster than the typical ventricular escape rhythm, it still originates from the ventricles.
Clinical Significance:
Ventricular rhythms, particularly those occurring due to complete heart block, are serious conditions requiring immediate medical attention. The unreliability of the rhythm can lead to insufficient blood flow and potentially cardiac arrest. Accelerated ventricular rhythms, while sometimes transient and benign, can also be associated with underlying heart conditions and warrant evaluation.
