Key result
Second or third-degree atrioventricular block at implant was the strongest predictor of pacing-dependency in patients with cardiovascular implantable electronic devices (OR 19.9).
Why the study?
Data on the prevalence and predictors for the development of pacing-dependency in patients with CIEDs are sparse.
Observational (n=802)
No
Odds Ratio: 19.9 (95% CI 10.9–38.5)
p-value: p=<0.01
Pacing dependency occurs in approximately 16% of patients with cardiovascular implantable electronic devices and is strongly predicted by baseline high-degree AV block, advanced heart failure, and chronic kidney disease.
High-degree AV block at implant may identify CIED patients at risk for dependency; supports risk stratification but leaves prospective validation open.
BACKGROUND: Data on the prevalence and predictors for the development of pacing-dependency in patients with cardiovascular implantable electronic devices (CIEDs) are sparse. METHODS: Pacing-dependency defined as an absence of intrinsic rhythm of ≥ 30 bpm was determined in 802 consecutive patients with CIEDs who visited the documented pacemaker or implantable cardioverter- defibrillator outpatient clinic for routine follow-up. RESULTS: A total of 131 (16%) patients were found to be pacing-dependent 67 ± 70 months after CIED implant. Multivariate analysis revealed a significant association between pacing-dependency and the following clinical variables: second or third-degree atrioventricular (AV) block at implant (OR = 19.9; 95% CI: 10.9-38.5, p < 0.01), atrial fibrillation at implant (OR = 2.15; 95% CI: 1.16-4.05, p = 0.02), left ventricular ejection fraction (LVEF) ≤ 30% (OR = 2.06; 95% CI: 1.03-4.15, p = 0.04), B-type natriuretic peptide (BNP) > 150 pg/mL (OR = 2.12; 95% CI: 1.16-3.97, p = 0.02), chronic kidney disease (OR = 1.86; 95% CI: 1.08-3.26, p = 0.03), and follow-up duration after implantation > 5 years (OR = 3.29; 95% CI: 1.96-5.64, p < 0.01). None of the remaining clinical variables including age, gender, diabetes mellitus, underlying heart disease, prior cardiac surgery or medication during follow-up including betablockers and amiodarone predicted pacing-dependency. CONCLUSIONS: Pacing-dependency is associated with second or third-degree AV-block at implant, atrial fibrillation before implant, low LVEF, elevated BNP, chronic kidney disease and follow-up duration after implant.
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Grimm et al. (2019) conducted an observational in Cardiovascular implantable electronic devices (CIEDs) (n=802). Second or third-degree AV block at implant vs. Absence of second or third-degree AV block at implant was evaluated on Pacing-dependency (absence of intrinsic rhythm ≥ 30 bpm) (OR 19.9, 95% CI 10.9-38.5, p=<0.01). Second or third-degree atrioventricular block at implant was the strongest predictor of pacing-dependency in patients with cardiovascular implantable electronic devices (OR 19.9).
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