Description:

• Interventions in the intensive management arm consist of 1) behavioral intensification and 2) pharmacological intensification based on olmesartan
• Participants will be given a wireless Bluetooth-equipped sphygmomanometer system, which is connected to the main server through the participants' own smartphone. Every blood pressure and heart rate measured will be encrypted and stored in the main server (Identical for both intervention and control groups).
• Regarding behavioral intensification, an automated texting and call for breakthrough visit will be sent from the main server to encourage regular measurements of BP and maintain a desirable goad of BP.
• Regarding pharmacological intensification, a specific algorithm for BP-lowering medication prescription will be provided to the responsible physicians by the steering committee.

Description:

• Other than a bluetooth-equipped sphygmomanometer, standard managements abiding by the most current guideline will be provided from the responsible physicians.
• Participants will be given a Bluetooth-equipped sphygmomanometer, which is connected to the main server through the participants' own smartphone. Every blood pressure and heart rate measured will be encrypted and stored in the main server (Identical for both intervention and control groups).

Suggested algorithm for behavioral intensification:

• If frequency of BP measurement ≤5 in a week, send a texting message
• If frequency of BP measurement ≤3 in a week, make a telephone contact by research nurse
• Target range of home-systolic blood pressure: 110 - 135
• If rate of outlier exceeds 50% in a week (based on ≥5 measurements in a week), make a telephone contact by research nurse (applied at least 2 weeks after randomization). A call for breakthrough visit may be issued when clinically required (decided by the institutional investigator)
• If frequency of BP measurement ≥ 10 in a week and frequency of outlier = 0 in a week, send a texting message to encourage and compliment on excellent BP management

Difference in days between recruitment of the first subject and last subject

Ratio of completed subject over randomized subjects in each group

Mean and standard deviation of breakthrough visits per each patient in the intensive management group

ratio of subjects response over the breakthrough visit calls

ratio of subjects with well-controlled BP in each group

Frequency of BP measurements out of the desirable BP range in a week

When two consecutive hits crossed over or below the margin of desirable BP, give 2x weight. Final score will be generated by dividing by total number of measurements