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CRT LV Lead Complications — EECC MCQ

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ModerateCardiac DevicesCRT LV Lead ComplicationsEECC

A 75-year-old man with HFrEF and complete AV block has a CRT-D implanted. The LV lead is placed via the coronary sinus into a posterolateral cardiac vein. What is the most common complication of coronary sinus LV lead placement?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: A — Lead dislodgement — occurs in approximately 5-10% of cases due to the tortuous venous anatomy; other complications include coronary sinus dissection, phrenic nerve stimulation, and elevated pacing thresholds

Coronary sinus (CS) LV lead implantation for CRT is technically more challenging than RV lead placement. Common complications include: (1) lead dislodgement (5-10% — the lead sits in a cardiac vein without active fixation); (2) CS dissection or perforation during cannulation/lead advancement (1-5%); (3) phrenic nerve stimulation (causing diaphragmatic pacing — the left phrenic nerve courses close to the lateral cardiac veins; managed by reprogramming pacing vectors or lead repositioning); (4) elevated pacing thresholds requiring reprogramming or lead revision. Failure to cannulate the CS or find a suitable target vein occurs in ~5-8% of cases, potentially requiring epicardial LV lead placement. The 2021 ESC Pacing Guidelines acknowledge these limitations and note that conduction system pacing (HBP/LBBAP) may offer a simpler alternative in some patients.

Reference: ESC (2021): Guidelines on Cardiac Pacing and CRT