In a multivariable rank ANCOVA model with important covariates and comorbidities including number of leads to be extracted, age of oldest lead, atrial fibrillation, previous smoking history, centers, and presence of SVC coil a higher fibrosis score was a marginally significant predictor of longer fluoroscopy time ( P =0.053), although not related to longer extraction time ( P =0.09).
Logistic regression analysis demonstrated a significant positive association of power sheath with higher fibrosis (odds ratio, 2.78 [95% CI, 1.22–6.31], P =0.015 after controlling for number of leads to be extracted, log-transformed age of the oldest lead, centers, and patient age) and an almost significant association of laser sheath use with higher fibrosis (odds ratio, 2.33 [95% CI, 0.93–5.84]; P =0.073 after controlling for number of leads to be extracted, log-transformed age of the oldest lead, and centers).