Integrated precise temperature regulation and electrophysiology sensing system for nanoplasmonic photothermal cardiac...

Bradyarrhythmia is a potentially life-threatening disease. Current pharmacological and surgical treatments are limited by side effects and invasiveness, with an urgent need for safer and noninvasive therapeutic strategies. In this study, we develop a multifunctional regulating-sensing platform that integrates precise temperature regulation with simultaneous electrophysiological detection. This platform employs gold nanorods (Au NRs) as nanoplasmonic photothermal effect carriers in combination with integrated serpentine-shaped resistance temperature sensors (RTSs) and a microelectrode array (MEA) device. Under near-infrared (NIR) irradiation, the RTS achieves precise regulation of the therapeutic temperature during nanoplasmonic photothermal therapy (NPT), while the MEA is utilized for dynamic monitoring of electrophysiological signals. The optimization of the RTS structural parameters enhances temperature response sensitivity. Precise modulation of NPT temperature enables restoration of the bradyarrhythmia cardiomyocytes to a normal rhythm, which can be sustained for up to 380 min. Compared with traditional thermal imaging strategy, the RTS-based strategy offers superior temperature resolution, shorter response time, and greater system integration potential, which significantly improves the safety and accuracy of the treatment. This integrated regulating-sensing platform provides an effective pathway for the precise treatment of bradyarrhythmia and holds significant implications in the field of clinical cardiology.