This condition involves a progressive lengthening of the delay within the atrioventricular (AV) node until a beat is ultimately blocked and fails to conduct to the ventricles. Understanding the Electrical Pathophysiology The core mechanism behind Wenckebach phenomenon is a decremental conduction through the AV node.
Second Degree AV Block Mobitz 1 Basics: Understanding Wenckebach
At that moment, an atrial contraction occurs without the corresponding ventricular response, resulting in a "dropped" beat and the characteristic pattern of the block. The classic finding is a steadily increasing PR interval duration, coupled with a progressively shorter R-R interval, culminating in a P wave that is not followed by a QRS complex.
This means that with each successive heartbeat, the electrical impulse encounters slightly more resistance, slowing its passage. Wenckebach can be physiological, often seen in athletes or during sleep due to high vagal tone.
Second Degree AV Block Mobitz 1 Basics: Understanding Wenckebach
Permanent pacing is rarely required unless the block escalates to a higher degree or symptoms become severe. Risk Factors and Population While Mobitz 1 can occur in any demographic, specific risk factors increase its likelihood.
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