Early-warning Intervention for Heat and Cold in Older Hypertensive Patients: Impact on Blood Pressure and ECG

This cluster-randomized trial, conducted in Tianjin, China, aims to evaluate the effectiveness of integrating a digital health risk early warning tool for heat with self-monitoring. Additionally, the study assesses the effectiveness of combining a digital health risk early warning tool for cold with self-monitoring. Communities from three districts will be randomly assigned to one of three groups: the combined intervention group (receiving health warnings via a WeChat mini-program and self-monitoring), the self-monitoring group (daily blood pressure (BP) and electrocardiogram (ECG) monitoring without warnings), and the control group (BP and ECG monitoring only during baseline and routine check-ups). The primary objective of the study is to evaluate the effectiveness of the intervention in improving blood pressure control and reducing the risk of electrocardiogram abnormalities, as well as understanding its underlying biological mechanisms.