Cardiac MRI Before Ventricular Tachycardia Ablation Shows Mixed Results in Systematic Review

Cardiac magnetic resonance imaging may help doctors map the scarred heart tissue that drives dangerous rapid heart rhythms, but a new systematic review and meta-analysis finds the evidence for its benefit is still limited. The review, published in BMC Cardiovascular Disorders on 27 October 2026, examined whether adding cardiac magnetic resonance (CMR) to ventricular tachycardia ablation improves procedural and long-term outcomes compared with conventional mapping alone.

The problem, the review’s authors note, is that arrhythmogenic substrate may sit within the heart wall, in the septum, or on the outer surface of the heart, and conventional electroanatomical mapping can incompletely identify it. CMR has been proposed as a way to better characterize this substrate and plan procedures before catheters ever enter the heart.

The researchers searched PubMed, MEDLINE via EBSCOhost, ScienceDirect, Scopus, and the Cochrane Library on March 16, 2026, following the PRISMA guideline. They included comparative studies of CMR-informed versus non-CMR-guided ventricular tachycardia ablation, pooling dichotomous outcomes as risk ratios and continuous outcomes as mean differences with 95% confidence intervals, using random-effects models. Where studies reported both CMR-guided and CMR-aided groups, these were combined to avoid double-counting shared control patients.

Only three nonrandomized comparative studies, comprising 339 patients in total, met the inclusion criteria. That small and observational evidence base shaped every finding. Complete procedural success was numerically more frequent with CMR-informed ablation, but the difference was not statistically significant and heterogeneity between studies was substantial, with a risk ratio of 1.39 (95% CI 0.94–2.05; I²=85%).

Two outcomes did favor CMR-informed ablation with no statistical heterogeneity. Residual ventricular tachycardia inducibility after substrate ablation was lower with CMR-informed approaches (RR 0.54, 95% CI 0.41–0.71; I²=0%), and fewer procedures ended in partial success (RR 0.46, 95% CI 0.30–0.71; I²=0%). No clear difference emerged in procedural failure (RR 0.66, 95% CI 0.23–1.93). Procedure duration, fluoroscopy time, and radiofrequency ablation time were not significantly different, and those analyses showed moderate-to-substantial heterogeneity.

One efficiency measure did reach significance: CMR-informed ablation was associated with fewer radiofrequency applications, with a mean difference of −7.24 (95% CI −11.88 to −2.59; I²=0%). The pooled long-term analysis also showed fewer reported events (RR 0.41, 95% CI 0.28–0.60; I²=0%). However, the authors caution that endpoint definitions differed across studies, because one study used a composite of ventricular tachycardia recurrence, heart transplantation, or death.

The review’s conclusions are deliberately measured. CMR-informed ventricular tachycardia ablation was associated with lower residual inducibility and fewer radiofrequency applications, while evidence for improved complete procedural success and shorter procedural duration remained inconclusive. The apparent reduction in long-term events should be interpreted cautiously, the authors write, because all included studies were observational, follow-up and endpoint definitions were inconsistent, and possible cohort overlap could not be excluded.

Those limitations matter for how the findings are read. With only three nonrandomized studies and 339 patients, the analysis cannot establish that CMR causes better outcomes, and the substantial heterogeneity in the complete success analysis suggests the included studies differed meaningfully in their populations and methods. The authors call for prospective, adequately powered studies using standardized CMR acquisition, integration, ablation, and follow-up protocols before firmer conclusions can be drawn.

For clinicians and researchers following the field, the review positions CMR as a promising adjunct to electroanatomical mapping rather than a proven replacement.

Subject of Research: The role of cardiac magnetic resonance in guiding ventricular tachycardia ablation

Article Title: Beyond Electroanatomical Mapping: The Role of Cardiac Magnetic Resonance in Ventricular Tachycardia Ablation, A Systematic Review and Meta-analyses

Article References: Karim, K., Pranata, R., Siregar, M. N. I., Lizal, D., Karwiky, G., Achmad, C., & Iqbal, M. (2026). Beyond Electroanatomical Mapping: The Role of Cardiac Magnetic Resonance in Ventricular Tachycardia Ablation, A Systematic Review and Meta-analyses. BMC Cardiovascular Disorders. https://doi.org/10.1186/s12872-026-06667-y

Image Credits: AI Generated

DOI: 10.1186/s12872-026-06667-y

Keywords: ventricular tachycardia, cardiac magnetic resonance, ablation, electroanatomical mapping, systematic review, meta-analysis, structural heart disease, substrate characterization, radiofrequency ablation, procedural outcomes, Beyond, Electroanatomical