Abstract 226: Sex Differences in Cardiac Catheterization Following Out-of-Hospital Cardiac Arrest

Abstract

Introduction: Cardiac catheterization is recommended for patients resuscitated from out-of-hospital cardiac arrest (OHCA) with a suspected cardiac etiology. Women are less likely than men to receive cardiac catheterization in other presentations of cardiovascular disease, but it remains unknown whether this disparity extends to OHCA. Objective: To determine whether patient sex is associated with undergoing cardiac catheterization after OHCA. Methods: We included all adult cases in the 2011 California Office of Statewide Health Planning and Development (OSHPD) database with a present-on-admission diagnosis of cardiac arrest (ICD-9-CM 427.5) or sudden cardiac death (ICD-9-CM 798) who were admitted from the emergency department to an acute care hospital. Data extracted from the OSHPD database included patient demographics, diagnoses, and procedures. ICD-9-CM procedure codes from the OSHPD database were used to identify patients who received cardiac catheterization. To determine factors associated with undergoing cardiac catheterization, we used a hierarchical logistic regression model that included age, sex, race, ethnicity, insurance type, ventricular arrest rhythm, and treatment at a hospital with 24/7 percutaneous coronary intervention capability. Results: We studied 4493 men and 3287 women admitted following OHCA. Women were older (median age 70 vs 64 years; p<0.001), had had fewer ventricular arrest rhythms (21.8% vs 31.7%; p<0.001), and received fewer cardiac catheterization procedures [12.5% vs 21.4%; p<0.0001]. This sex difference in cardiac catheterization persisted in the multivariable hierarchical model (adjusted OR 0.65; 95% CI 0.57-0.76; p<0.0001) and in a subgroup analysis including only patients with ventricular arrest rhythms (adjusted OR 0.63; 95% CI 0.51-0.78; p<0.0001) Conclusion: Sex differences exist in cardiac catheterization following resuscitation from OHCA. Future efforts should focus on understanding and resolving these differences.