In Mobitz Type I second-degree AV block, pacemaker implantation is recommended in which scenario?

In Mobitz Type I second-degree AV block, pacemaker implantation is recommended in which scenario?

• A. Asymptomatic patients
• B. Symptomatic patients
• C. All patients
• D. Never

Answer: (B)

Mobitz type I second-degree AV block (Wenckebach) is usually at the AV node and often benign, especially when the patient has no symptoms. The reason pacing is recommended only for symptomatic cases is that symptoms like dizziness, presyncope, syncope, or signs of poor perfusion reflect clinically significant bradycardia from the block. In these patients, a pacemaker prevents pauses and maintains a reliable heart rate, improving perfusion and reducing episodes of cerebral hypoperfusion related to slow ventricular rates. For asymptomatic individuals, you address reversible factors (medications, vagal tone, electrolyte issues) and monitor rather than implant a device. It’s not appropriate to pace all patients with Mobitz I, and it’s not correct to say never; pacing is indicated when the bradyarrhythmia causes symptoms.

Mobitz type I second-degree AV block (Wenckebach) is usually at the AV node and often benign, especially when the patient has no symptoms. The reason pacing is recommended only for symptomatic cases is that symptoms like dizziness, presyncope, syncope, or signs of poor perfusion reflect clinically significant bradycardia from the block. In these patients, a pacemaker prevents pauses and maintains a reliable heart rate, improving perfusion and reducing episodes of cerebral hypoperfusion related to slow ventricular rates.

For asymptomatic individuals, you address reversible factors (medications, vagal tone, electrolyte issues) and monitor rather than implant a device. It’s not appropriate to pace all patients with Mobitz I, and it’s not correct to say never; pacing is indicated when the bradyarrhythmia causes symptoms.