Value of 24h ambulatory ECG for prediction of sufficient number of premature ventricular complexes during catheter ablation
Authors: Aagaard-Nilsen S , Dejgaard L A , Anfinsen O A , Lyseggen E , Holm T , Fink T S , Odland H H , Sevre K , Kongsgaard E , Hegdom F , Stokke M K 
Published: May 2024

Abstract

Introduction
Successful catheter ablation (CA) of premature ventricular complexes (PVCs) depends on identification of the site of origin (SOO), but no parameter suggested for prediction of success from CA have been sufficiently validated in previous studies. Activation mapping and pace-mapping are invasive methods for the identification of SOO, and the burden of PVCs is critical for activation mapping to identify SOO. The number of PVCs in 24h ambulatory ECGs is claimed to predict occurrence of PVCs during the procedure, and hence procedural success, but the predictive value remains unknown.

Purpose
The primary objective of this study was to quantify the predictive value of pre-procedural of 24h ambulatory ECG with regard to sufficient number of PVCs during the CA procedure.

Methods
Patients admitted for CA of PVCs at our hospital from 2011-2020 were included. Data were retrospectivity collected from electronic health records. Clinical characteristics, results from clinical pre-procedural examinations, including 24h ambulatory ECG, exercise testing and echocardiogram, as well as acute outcomes were recorded.

Results
A total of 332 patients were included, CA was performed in 285 (86 %) patients, while 47 (14 %) patients had insufficient number of PVCs to allow adequate identification of SOO. Neither clinical characteristics nor results of cardiac imaging separated patients with sufficient and insufficient number of PVCs for CA, respectively. Patients with sufficient number of PVCs had nominally more PVCs in the preceding 24h ambulatory ECG, although the difference was not statistically significant (16007 (6509-26205) vs. 8332 (3066-20974), p = 0.055). A receiver operating characteristics (ROC) curve analysis of sufficient number of PVCs during CA and number of PVCs in the preceding 24h ambulatory ECG had an area under curve (AUC) of 0.610 (0.95% CI 0.498-0.722, p = 0.055). The commonly clinically used cut-off of &gt;10 000 PVCs/24h had a positive predictive value of 67 % and a negative predictive value of 57 % for sufficient number of PVCs during CA. The median period from the 24h ambulatory ECGs to CA was 183 days (6 months). The positive and negative predicative values for &gt;10 000 PVCs in 24h ambulatory ECG performed &gt;6 months prior to the procedure were 67 % and 71 %, respectively, compared to 53 % and 61 % for 24h ECGs performed &lt;6 months prior to the procedure. The ROC curve for sufficient number of PVCs during the procedure and number of PVCs in a 24h ambulatory ECG performed &gt;6 months and &lt;6 months prior to the procedure did not differ, with had AUC values of 0.665 and 0.584, respectively (p = 0.4).

Conclusion
In this retrospective analysis of a large cohort of patients admitted for CA of PVCs, number of PVCs in 24h ambulatory ECGs recorded prior to the procedure had a low predictive value for presence of PVCs during CA. Others parameters need to be evaluated to improve prediction.