AIMS: Antihypertensive drug therapy is a major strategy of stroke prevention among hypertensive patients. The aim of this study was to estimate the excess risk of stroke associated with non-adherence to antihypertensive drug therapy among hypertensive patients. METHODS AND RESULTS: We conducted a population-based study using records from Finnish national registers for 1 January 1995 to 31 December 2007. Of the 73 527 hypertensive patients aged 30 years or older and without pre-existing stroke or cardiovascular disease, 2144 died from stroke and 24 560 were hospitalized due to stroke during the follow-up. At the 2- and 10-year follow-up after the start of continuous antihypertensive medication, non-adherent patients had 3.81 [95% confidence interval (CI) 2.85-5.10] and 3.01 (95% CI: 2.37-3.83) times higher odds of stroke death when compared with the adherent patients. The corresponding odds ratio (OR) for stroke hospitalization was 2.74 (95% CI: 2.35-3.20) at Year 2 and 1.71 (95% CI: 1.49-1.96) at Year 10. In the stroke-event year, the ORs were higher, 5.68 (95% CI: 5.05-6.39) for stroke death and 1.87 (95% CI: 1.72-2.03) for hospitalization. Among those using agents acting on the renin-angiotensin system combined with diuretics or β-blockers, these ORs were 7.49 (95% CI: 5.62-9.98) and 3.91 (95% CI: 3.23-4.75), respectively. The associations between non-adherence and stroke followed a dose-response pattern--the poorer the adherence, the greater the risk of death and hospitalization due to stroke. CONCLUSION: These data suggest that poor adherence to antihypertensive therapy substantially increases near- and long-term risk of stroke among hypertensive patients.
AIMS: Antihypertensive drug therapy is a major strategy of stroke prevention among hypertensive patients. The aim of this study was to estimate the excess risk of stroke associated with non-adherence to antihypertensive drug therapy among hypertensive patients. METHODS AND RESULTS: We conducted a population-based study using records from Finnish national registers for 1 January 1995 to 31 December 2007. Of the 73 527 hypertensive patients aged 30 years or older and without pre-existing stroke or cardiovascular disease, 2144 died from stroke and 24 560 were hospitalized due to stroke during the follow-up. At the 2- and 10-year follow-up after the start of continuous antihypertensive medication, non-adherent patients had 3.81 [95% confidence interval (CI) 2.85-5.10] and 3.01 (95% CI: 2.37-3.83) times higher odds of stroke death when compared with the adherent patients. The corresponding odds ratio (OR) for stroke hospitalization was 2.74 (95% CI: 2.35-3.20) at Year 2 and 1.71 (95% CI: 1.49-1.96) at Year 10. In the stroke-event year, the ORs were higher, 5.68 (95% CI: 5.05-6.39) for stroke death and 1.87 (95% CI: 1.72-2.03) for hospitalization. Among those using agents acting on the renin-angiotensin system combined with diuretics or β-blockers, these ORs were 7.49 (95% CI: 5.62-9.98) and 3.91 (95% CI: 3.23-4.75), respectively. The associations between non-adherence and stroke followed a dose-response pattern--the poorer the adherence, the greater the risk of death and hospitalization due to stroke. CONCLUSION: These data suggest that poor adherence to antihypertensive therapy substantially increases near- and long-term risk of stroke among hypertensive patients.
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