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CRT LV Lead Position Importance — EECC MCQ

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ModerateCardiac DevicesCRT LV Lead Position ImportanceEECC

A 65-year-old man with HFrEF (LVEF 25%) and LBBB (QRS 160 ms) undergoes CRT-D implantation. At implant, the coronary sinus (CS) anatomy is challenging with no suitable lateral or posterolateral veins. The LV lead is eventually placed in an anterolateral vein. Is this an optimal position?

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Correct answer: D — Anterolateral LV lead position is suboptimal — lateral or posterolateral veins are associated with the best CRT response; anterior positions may cause dyssynchrony from pacing near the RV lead and are associated with reduced CRT benefit or even worse outcomes

LV lead position is a critical determinant of CRT response. Evidence consistently shows: (1) lateral or posterolateral positions produce the best haemodynamic improvement and clinical outcomes (pacing the site of latest mechanical activation in LBBB); (2) anterior positions may be ineffective or harmful — pacing near the RV lead position reduces the resynchronisation effect and can worsen dyssynchrony; (3) apical positions have intermediate outcomes. The 2021 ESC Pacing/CRT Guidelines recommend targeting the latest-activated LV segment (typically lateral/posterolateral in LBBB). If CS anatomy precludes lateral positioning: (1) reposition to an alternative vein; (2) consider epicardial LV lead (surgical approach); (3) consider conduction system pacing (LBBAP) as an alternative CRT strategy. CMR or echo to identify scar should be performed pre-procedure — avoid pacing over scar (poor threshold, reduced benefit).

Reference: ESC (2021): Pacing/CRT Guidelines