Structural heart disease, not the right ventricular pacing site, determines the QRS duration during right ventricular pacing

• Published in: Heart and vessels Vol. 36; no. 12; pp. 1870 - 1878
• Main Authors: Ogano, Michio, Tsuboi, Ippei, Iwasaki, Yu-ki, Tanabe, Jun, Shimizu, Wataru
• Format: Journal Article
• Language: English
• Published: Tokyo Springer Japan 01-12-2021; Springer Nature B.V
• Subjects: Ablation; Apexes; Biomedical Engineering and Bioengineering; Bundle-Branch Block; Cardiac Pacing, Artificial; Cardiac Surgery; Cardiology; Cardiovascular diseases; Catheters; Confidence intervals; Coronary artery disease; Diameters; Electrocardiography; Heart Diseases; Heart Ventricles - diagnostic imaging; Humans; Medical instruments; Medicine; Medicine & Public Health; Original Article; Outflow; Prolongation; Regression analysis; Septum; Statistical analysis; Tachyarrhythmia; Vascular Surgery; Ventricle; Ventricular Septum; Heart failure; Pacing; QRS duration; Right ventricle; Electrical dyssynchrony
• ISSN: 0910-8327; 1615-2573
• DOI: 10.1007/s00380-021-01881-4

Right ventricular (RV) pacing causes changes in the heart’s electrical and mechanical activation patterns. The QRS duration is a useful surrogate marker of electrical dyssynchrony; a longer QRS duration during RV pacing indicates poor prognosis. However, the mechanisms underlying a longer QRS duration during RV pacing remain unclear; hence, we investigated factors predicting QRS prolongation during RV pacing. We enrolled 211 patients who underwent catheter ablation for supraventricular tachyarrhythmia and showed no bundle branch block. Three-dimensional mapping for the QRS duration during RV pacing from the RV outflow to RV apex was performed, and differences in the QRS duration were analyzed. The predisposing factors causing QRS > 160 ms during RV apical pacing were also analyzed. The QRS durations at baseline and during RV pacing from the RV outflow and at the RV apex were 85.0 ± 7.5 ms, 163.7 ± 17.1 ms, and 156.2 ± 16.1 ms, respectively. With respect to the QRS duration, there was a significant correlation between RV outflow and RV apical pacing (
r
 = 0.658,
p
 < 0.001). Difference in the QRS duration between the RV outflow and RV apex in each patient was only 12.5 ± 10.4 ms. Logistic multivariable regression analysis identified baseline QRS duration [odds ratio (OR) 1.24, 95% confidence interval (CI) 1.15–1.33,
p
 < 0.01], interventricular septum thickness (OR 1.20, 95% CI 1.02–1.40,
p
 = 0.025), left atrial diameter (OR 1.08, 95% CI 1.01–1.16,
p
 = 0.024), and E/e’ (OR 1.23, 95% CI 1.12–1.35,
p
 < 0.01) as significant predictors of QRS prolongation during RV apical pacing. The QRS duration during RV pacing largely depends not on the pacing site, but on the underlying structural heart diseases.