A 2:1 atrioventricular block presenting paradoxical ventriculophasic response

Area of Science:

• Cardiology
• Electrophysiology
• Cardiac Arrhythmias

Background:

• Ventriculophasic response (VR) is characterized by a shortened sinus cycle length during atrioventricular (AV) block.
• This phenomenon typically involves shorter PP intervals when a QRS complex intervenes.

Observation:

• An 80-year-old male patient presented with a 2:1 AV block.
• The patient exhibited both typical and paradoxical forms of ventriculophasic response.

Findings:

• The observation of both typical and paradoxical VR in a single patient with 2:1 AV block is a rare clinical finding.
• This case highlights the complex electrophysiological behaviors that can occur with AV conduction abnormalities.

Implications:

• Understanding VR, including its paradoxical form, is crucial for accurate diagnosis and management of complex AV block.
• This case may prompt further investigation into the mechanisms underlying paradoxical VR and its clinical significance.