Hypertension is a leading risk factor for cardiovascular disease, which is especially prevalent among minority urban patients. Our group and others have previously shown that socio-environmental factors such as crime and poverty raise cardiovascular risk. However, the acute effects of local urban gunfire on patients’ blood pressure are unknown. We hypothesized that local gunfire in our South Side Chicago community was temporally associated with an acute rise in blood pressure for nearby patients. We performed a retrospective cohort study including 7,564 patients aged 18-104 who completed two or more outpatient clinic visits within 1 year at our academic tertiary-care center on the South Side of Chicago. We included 41,554 pre-pandemic clinic visits and recorded the blood pressure for each visit. Local gunfire was measured using ShotSpotter®, a network of microphones installed throughout the South Side of Chicago, which locates gunshots using auditory triangulation. Datasets of gunfire incidents are publically available from ShotSpotter® including date/time and geolocation of incidents. We focused on incidents that occurred within 1 km of each patient’s address and between two clinic visit dates (33 days, on average). Our primary outcome was the change in systolic blood pressure between the two clinic appointments. We excluded patients whose antihypertensive regimen was changed at the first appointment. Next, we utilized a multivariate regression model to assess the relationship between incidents of gunfire and seasonally-adjusted changes in blood pressure. Between-visit gunshot exposure ranged from 1 to 1,793 per patient. We found that each incident of gunfire was associated with a statistically significant acute increase in systolic blood pressure (0.0033 mmHg increase per gunfire incident [0.0022, 0.0044], p<0.0001). Results were similar regardless of whether total round count or total gunfire incidents were considered. In this study of urban patients, incidence of gunfire within 1 km of a patient’s address was associated with an acute rise in blood pressure over approximately 1 month. These findings implicate the adverse impact of local gunfire exposure and environmental stress on blood pressure in adults on the South Side of Chicago.
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