Background: Patients with hypertension are primarily treated in general practice. However, major studies of patients with hypertension are rarely based on populations from primary care. Knowledge of blood pressure (BP) control rates in patients with diabetes and/or cardiovascular diseases (CVDs), who have additional comorbidities, is lacking. We aimed to investigate the association of comorbidities with BP control using a large cohort of hypertensive patients from primary care practices.
Methods and results: Using the Danish General Practice Database, we included 37 651 patients with hypertension from 231 general practices in Denmark. Recommended BP control was defined as BP <140/90 mm Hg in general and <130/80 mm Hg in patients with diabetes. The overall control rate was 33.2% (95% CI: 32.7 to 33.7). Only 16.5% (95% CI: 15.8 to 17.3) of patients with diabetes achieved BP control, whereas control rates ranged from 42.9% to 51.4% for patients with ischemic heart diseases or cerebrovascular or peripheral vascular diseases. A diagnosis of cardiac heart failure in addition to diabetes and/or CVD was associated with higher BP control rates, compared with men and women having only diabetes and/or CVD. A diagnosis of asthma in addition to diabetes and CVD was associated with higher BP control rates in men.
Conclusion: In Danish general practice, only 1 of 3 patients diagnosed with hypertension had a BP below target. BP control rates differ substantially within comorbidities. Other serious comorbidities in addition to diabetes and/or CVD were not associated with lower BP control rates; on the contrary, in some cases the BP control rates were higher when the patient was diagnosed with other serious comorbidities in addition to diabetes and/or CVD.