Blood pressure control rates measured in specialty vs primary care practices within a large integrated health system.

Blood pressure measurement is a diagnostic test and a key component of assessing and managing hypertension, a major contributor to cardiovascular risk. Based on real-world clinical observations within a large, university-based, accountable care organization, we sought to assess whether blood pressure control results varied by the assessment setting, primary care versus specialty. We studied the most recent outpatient measurement for patients with hypertension during the 2016 calendar year and categorized each as being performed in a primary care or specialty setting, and as being controlled (<140/90 mm Hg) or uncontrolled. Among the 86 512 patients identified, the 43 364 whose most recent blood pressure measurement was in a specialty setting were significantly less likely to be controlled compared to the 43 148 whose most recent measurement was in primary care (63% vs 68%, respectively, OR = 0.83 [0.80-0.85]). For the 27 955 patients who had measurements performed in both settings during the year, the control rates based upon their most recent specialty and primary care measurements were 63% and 71%, respectively (OR = 0.62, 0.60-0.65). For the subsets of patients whose measurements in each setting were within 30 or within seven days of each other, the odds of control in the specialty versus primary care setting were 0.63 (0.58-0.75) and 0.65 (0.57-0.75), respectively. Health systems should weigh the value of performing blood pressure measurement in specialty settings that do not manage this condition, taking into consideration the resources required to perform it and the potential negative consequences of inaccurate measurements.