Left ventricular lead implantation failure in an unselected nationwide cohort

BACKGROUND Left ventricular (LV) lead implantation is often the most challenging aspect of cardiac resynchronization therapy (CRT) procedures; early studies reported implant failure rates in-10% of cases.OBJECTIVE The purpose of this study was to define rates, reasons for, and factors independently associated with LV lead implant failure.METHODS We studied patients with left bundle branch block and ejection fraction < 35% who underwent planned de novo transve- nous CRT implantation (2010-2016) and were reported to the Na- tional Cardiovascular Data Registry ICD Registry. Independent predictors of LV lead implant failure were determined using logistic regression; age, sex, and variables with a univariable P value of ,.15 were considered for inclusion in the model.RESULTS Of the 111,802 patients who underwent a planned CRT procedure, 3.6% of patients (n 53979) had LV lead implant failure. Reasons for implant failure included venous access (7.5%), coronary sinus access (64.3%), tributary vein access (13.5%), coronary sinus dissection (7.6%), unacceptable threshold (4.4%), and diaphragmatic stimulation (1.7%). Significant independent predictors of LV lead implant failure included younger age (odds ratio [OR] 1.01; 95% confidence interval [CI] 0.1.01-1.02), female sex (OR 1.38; 95% CI 1.29-1.47), black race (vs white, OR 1.44; 95% CI 1.32-1.57), Hispanic ethnicity (OR 1.23; 95% CI 1.08-1.40), QRS duration (OR 1.055 per 10 ms; 95% CI 1.038-1.072 per 10 ms), obstructive sleep apnea (OR 1.14; 95% CI 1.04-1.24), and implan- tation by a physician without specialized training (vs electrophysi- ology trained, OR 1.53; 95% CI 1.34-1.76).CONCLUSION LV lead implant failure is uncommon in the current era and is most commonly due to coronary sinus access failure. Pre- dictors of LV lead implant failure included younger age, female sex, black race, Hispanic ethnicity, increased QRS duration, sleep apnea, and absence of electrophysiology training.

Automated summary

This study aimed to analyze the rates, reasons, and independent factors associated with left ventricular lead implant failure. The results showed that 3.6% of patients undergoing planned CRT procedures experienced LV lead implant failure. The main reasons for implant failure included venous access issues, coronary sinus access issues, tributary vein access issues, coronary sinus dissection, unacceptable threshold, and diaphragmatic stimulation.