Abstract P398: The effects of care by hypertension specialists on cardiovascular outcome, blood pressure control and cost-effectiveness among uncontrolled hypertensive patients

Background: Studies suggested that physician specialty had an impact on patient outcomes of cardiovascular disease. However, the effects of care by hypertension specialists on clinical outcomes and financial burden among uncontrolled hypertensive patients are unknown. Objective: This study was to assess the effects of care by hypertension specialists on risk of cardiovascular outcomes, blood pressure (BP) control, and cost-effectiveness among patients with uncontrolled hypertension. Methods: A retrospective cohort study of patients aged 45-79 years who were admitted for uncontrolled hypertension was conducted. We assessed the relationship between care by hypertension specialists and major adverse cardiovascular events (MACE), BP control, quality-adjusted life years (QALYs) and incremental cost-effectiveness ratios (ICERs) by the Cox regression, the generalized estimating equations (GEE) model, and the Markov model, respectively. Results: A total of 10680 patients with uncontrolled hypertension were followed up for a median of 4.0 years. Among the 5646 (52.9%) patients received care by hypertension specialists and had fewer MACE than the non-specialists group (21.5 vs 39.7 per 1000-person-year; hazard ratio 0.67; 95% CI: 0.57 to 0.79) according to multiple Cox regression after stabilized inverse probability of treatment weighting. At 4 years, the odds ratio between the hypertension specialist group and the non-specialist group was 0.83 (95% CI: 0.79 to 0.86). Odds ratios with declining trend were observed at 1, 2, and 3 years. Over a lifetime horizon, the ICERs of the hypertension specialists group was USD 6295.37 per QALY gained compared with the non-specialists group. Conclusions: This study provided some evidence that care by hypertension specialists was associated with reduced risk of MACE and improved BP control in patients with uncontrolled hypertension, and was cost-effective.