Effect of Home and Remote Blood Pressure Monitoring Via Home BP Monitoring System (HMS) on Adults With Hypertension in Taiwan

The goal of this clinical trial is to learn whether adding case-manager support to app-connected home blood pressure monitoring improves blood pressure control in adults with hypertension. The main questions it aims to answer are: * Does case-manager surveillance with physician-guided medication adjustment lower office, home, and 24-hour ambulatory blood pressure more than home monitoring with review of readings only at clinic visits? * Does it change how consistently participants measure their blood pressure at home, how their blood pressure medicines are adjusted, and how often side effects are reported? All participants received the same Bluetooth upper-arm blood pressure monitor linked to a smartphone app (OMRON Home BP Monitoring System, HMS). They measured their blood pressure at home in the first week of every month, following the Taiwan \"722\" schedule: 7 consecutive days, morning and evening, 2 readings each time. Each participant spent 6 months in each of two conditions, in a randomly assigned order: * Case-manager period: case managers reviewed the home readings every month, contacted participants, and arranged earlier clinic visits for medication adjustment when readings met predefined criteria. * Control period: home readings were stored and reviewed by the cardiologist only at scheduled clinic visits. Participants attended clinic visits at the start of the study and at 3, 6, 9, and 12 months.