RS20 - Lack of Access to Primary Care Reduces Survival Following Aortic Dissection

Objectives: Optimal medical management is critical for the long-term treatment of aortic dissections (AD) to prevent complications and improve survival. Medical management is known to be influenced by various social determinants of health (SDOH), including health insurance, social support, distance to the hospital, and primary care provider (PCP) access. This study was designed to determine the relative impact of these different geographic and SDOH factors on the long-term survival of patients after diagnosis and treatment for acute AD.

Methods: We retrospectively analyzed patients presenting to a single academic tertiary medical center for surgical and medical management of acute AD (Type A and B) from January 2010 to December 2020. Data was collected regarding patient demographics, perioperative hospital course, and SDOH factors such as home/social status, primary and secondary insurance status, PCP access following surgery, distance to the hospital, and 2020 Area Deprivation index scores. Cox proportional hazards regression models were used to estimate the risk-adjusted association between SDOH variables and mortality following acute AD.

Results: We identified 124 patients who presented with an acute AD during the study period (25% type A, 25% type B, and 50% with both type A and B components), which were predominantly male (68%) with a mean age of 60 years. Patients resided a median distance of 30.2 miles from the medical center, 18% lived alone, and 9% were uninsured. Roughly half of the cohort (52%) was documented to have access to a PCP, and patients with a PCP were significantly more likely to be maintained on antihypertensive (anti-HTN) medication therapy during follow-up (Figure 1). The most common anti-HTN agents were ACE inhibitors or ARBs (56%), followed by beta-blockers (44%), and calcium channel blockers (26%). Over a median follow-up of 14.6 months, 43 (35%) patients died, with reduced survival observed among patients with no-PCP access (Figure 2). In risk-adjusted models, increasing age, no-PCP access and lack of insurance were all found to be independent predictors of mortality following acute AD. Further, uninsured patients with no-PCP access or medication use had the highest risk for mortality (HR=27.6, 95% CI=8.95-85.23, p< 0.001).

Conclusions: Lack of access to a PCP and anti-HTN therapy following acute AD significantly increases the risk of short and long-term mortality. These findings are independent of how far patients live from the hospital or other SDOH factors, highlighting the importance of community outreach programs to maintain medical management for uninsured AD patients.