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[Blood pressure lowering efficacy of telmisartan and amlodipine taking on the morning or at bedtime: ABPM results].

OBJECTIVE
To observe the blood lowering effect of telmisartan and amlodipine taking on the morning or at bedtime in hypertensive patients.


METHODS
A total of 108 individuals with hypertension (grade 2 or above) were randomized to receive telmisartan and amlodipine in one of the following four therapeutic schemes: Group A (26 cases): both medications taken on the morning; Group B (28 cases): both medication taken at bedtime; Group C (27 cases): telmisartan on the morning and amlodipine at bedtime; or Group D (27 cases): amlodipine on the morning and telmisartan at bedtime. ABPM was performed before and after 8 weeks treatment.


RESULTS
BP was significantly reduced in 4 groups and the value of 24 hours SBP/DBP decline for each group after treatment was 29.94/16.32, 31.37/18.35, 29.49/17.30 and 25.80/15.51 mm Hg (1 mm Hg = 0.133 kPa) respectively (P < 0.05 vs. baseline). SI (smooth index) of 24 hours SBP/DBP was 1.79/1.34, 2.07/1.54, 1.70/1.43 and 1.55/1.32 respectively (P > 0.05). The night-time BP decline and the distributive difference of dipper, non-dipper, extreme dipper and reverse dipper pattern were similar among groups at both baseline and after various treatment regimens (all P > 0.05) . Morning blood pressure surge (MBPS) after treatment in group B declined more significantly than other groups (P < 0.05).


CONCLUSION
Telmisartan/amlodipine administered either on the morning or at bedtime can effectively reduce blood pressure. The efficacy of BP lowering is independent of the drug taking time. There is a trend both in better BP lowering and less BP variability when two medications are administered at bedtime.