CardioSignal: a novel smartphone-based mechanocardiography tool for detection of atrial fibrillation recurrence after catheter ablation

Background Accurate and early detection of atrial fibrillation (AF) recurrence after catheter ablation is essential for optimizing follow-up and treatment strategies. Traditional ECG-based methods are effective but often limited by cost and practicality for long-term monitoring. Mechanocardiography (MCG), which records cardiac vibrations through smartphone motion sensors, may provide a non-invasive and accessible alternative. Purpose To evaluate the usability and performance of the smartphone-based CardioSignal MCG application for detecting AF recurrence following ablation. Methods In this retrospective single-centre study, 640 patients who underwent AF ablation between September 2024 and March 2025 were offered free access to CardioSignal for home-based rhythm monitoring. Participants received brief instruction on app use. Measurement data and usability feedback were analyzed. Results Of 640 patients, 521 (81%) used CardioSignal, and 354 (68%) remained active six months post-ablation (Figure 1). In the first month, 8,240 recordings were performed (80% sinus rhythm, 6% AF, 14% failed). At six months, 2,869 recordings were made (87% sinus rhythm, 5% AF, 8% failed)(Figure 2). Median active measurement days declined from 6 (IQR 1–25) to 3 (IQR 0–9). Among 338 survey respondents (49% response rate; median age 67 years; 68% male), 91% valued post-ablation monitoring, 95% found the app easy to use, and 92% rated results and instructions as clear. Over 40% reported reassurance from home monitoring. Conclusion CardioSignal demonstrated high usability, engagement, and patient satisfaction, supporting its role as a feasible and scalable method for remote AF recurrence monitoring after ablation. Smartphone-based mechanocardiography may complement conventional ECG follow-up in contemporary AF management.