Radiofrequency-based wearable sensor patch in heart failure management: a focused review

ZOLL Heart Failure Management System (ZOLL HFMS) is a non-invasive, remote monitoring device that employs radiofrequency signals transmitted through an adhesive patch embedded with integrated sensors to evaluate lung fluid levels. By analyzing trends in lung fluid status and related parameters, ZOLL HFMS may facilitate the early detection of heart failure (HF) decompensation and enable timely interventions. Insights from the recent BMAD trial (Impact of heart failure management using thoracic fluid monitoring from a novel wearable sensor: Results of the Benefits of Microcor [µCor™] in Ambulatory Heart Failure) highlight its promise in those with recent HF hospitalization, demonstrating a reduction in time to first HF readmission and improvement in quality of life. In this review, we summarize data on the ZOLL HFMS, with a focus on its lung fluid analysis mechanism for early HF decompensation detection and the accuracy of its measurements compared to other modalities. Then, we examine key outcomes from the recent BMAD trial, highlighting their clinical relevance and identifying gaps that warrant further investigation in future clinical trials. Lastly, we outline potential directions for integrating this technology into routine HF management.