ArticleJACC. Case reports2026
Near R-on-T Phenomenon and Myocardial Capture Associated With a Novel Intravascular Lithotripsy System.
Article in JACC. Case reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Abstract
backgroundVentricular myocardial capture, or "shocktopics," is a known phenomenon during intravascular lithotripsy (IVL). While well documented with established systems, data on newer IVL platforms are limited. We report a case of near R-on-T phenomenon using a novel IVL system. CASE SUMMARY: A 74-year-old woman underwent percutaneous coronary intervention for a severely calcified left anterior descending artery lesion. During the application of a novel IVL system (Shunmei), frequent ventricular capture was observed. Several pulses occurred late in the T wave, representing a near R-on-T phenomenon. Despite these findings, the patient remained hemodynamically stable, and no sustained arrhythmias occurred. DISCUSSION: This case confirms that IVL-induced ventricular capture is a class effect rather than being device specific. The occurrence of near R-on-T capture highlights the potential for life-threatening arrhythmias, although the clinical course is typically benign. TAKE-HOME MESSAGES: Continuous electrocardiographic and hemodynamic monitoring are mandatory during IVL across all device platforms to detect myocardial capture. Operators should remain vigilant for R-on-T phenomena, which may pose a theoretical risk for malignant arrhythmias. The development of electrocardiogram-synchronized (gated) IVL delivery systems may represent a critical future step in eliminating the risk of R-on-T pulses and enhancing procedural safety.
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