Factors Associated with Uncontrolled High Blood Pressure amongst patients with Hypertension at Harare Central Hospital in Zimbabwe
Background: Hypertension is a public health problem with high mortality and morbidity globally. A rapid assessment of hypertensive patients at Harare Central Hospital Outpatients Department (OPD) in June 2013 revealed that 41% of patients had uncontrolled hypertension. We, therefore, explored the factors associated with uncontrolled hypertension among hypertensive patients at Harare Hospital. Methods: A one-on-one unmatched case-control study was conducted among 118 cases and 118 controls. A case was a person aged 18years and above on hypertensive treatment for ≥6months with mean Blood Pressure (BP) ≥ 140/90mmHg while a control was 18years and above on hypertensive treatment ≥6 months with mean BP<140/90mmHg. Interviews were used to collect information on socio-demographic, treatment, health system, condition, and patient-related factors. Written informed consent was obtained from all study participants. Medication adherence was measured with Morisky medication adherence scale-8. Results: The median ages for cases were 49 years (IQR: 41-63) and 48 years (IQR: 42-62) for controls. Almost 57% were women with 23% living in rural areas. Most cases (94%) and controls (78%) added salt to meals. Rural women were less likely to have uncontrolled BP compared to urban women (OR=0.7; 95%CI: 0.35, 1.37). Lack of exercise, adding salt to meals and eating fruits/vegetables less than three times/week were associated with uncontrolled BP. Independent factors associated with uncontrolled BP were low adherence to medication, aOR 22.03 (95%CI: 9.10,53.5), receiving health education, aOR 0.24 (95%CI: 0.11 , 0.53), exercises aOR 0.33 (95%CI: 0.15,0.73) and on medical insurance aOR 2.69 (955CI: 1.12,6.44). Conclusions: Common risk factors for hypertension were associated with uncontrolled BP. Since these are modifiable factors there is a need to implement interventions that will encourage healthy living in this population to improve treatment outcomes.