Abstract 288: Incidence And Outcomes Of In-hospital Cardiac Arrest Among Pulmonary Arterial Hypertension-related Hospitalizations In The United States

Background: Cardiac arrest is a known complication of Pulmonary arterial hypertension (PAH) often due to acute right heart failure and arrhythmias. However, data on trends in the incidence and in-hospital outcomes of in-hospital cardiac arrest (IHCA) among PAH-related hospitalizations in the US is limited. Hypothesis: IHCA incidence has declined and In-hospital outcomes improved among PAH-related hospitalizations. Methods: We identified hospitalizations with a primary diagnosis of PAH in the nationwide inpatient database between 2010 and 2019, using the appropriate international classification of disease codes. We extracted patients who underwent cardiopulmonary resuscitation for IHCA and evaluated temporal trends in the incidence and in-hospital outcomes using the Cochrane-Armitage test. Logistic regression was used to evaluate factors associated with odds of survival to hospital discharge. Results: We identified 18,772 PAH-related hospitalizations during the study period. The IHCA incidence rate was 1.8% with a mean age (SD) of 62 years (16) and females predominantly affected (62.8%). There was a non-significant decline in IHCA incidence rate between 2010 and 2019 (1.9% vs. 1.2%, P=0.08). The overall survival to hospital discharge rate was 30.4% and this increased significantly during the study period (26.7% vs 36.9%, P = 0.04). Most of the survivors were discharged to a long-term acute care facility (44.2%) and 18.% were discharged home without the need for home health care. Factors associated with lower odds of survival were age > 65 years OR 0.97, 95% CI 0.96 - 0.98, P < 0.001), acute right heart failure (OR 0.74, 95% CI 0.60 - 0.90, P<0.001), acute respiratory failure (OR 0.20, 95% CI 0.16 - 0.24, P < 0.001), and severe comorbidity index (OR 0.83, 95% CI 0.71-0.96, P < 0.001). The presence of shockable rhythm (OR 1.67, 95% CI 1.31 - 2.26, P=0.03) and obesity (OR 1.33, 95% CI 1.02 - 1.72, P=0.03) were associated with higher odds of survival Conclusion: Though IHCA survival among resuscitated PAH-related hospitalizations improved during the 10-year study period in the US, only about 3 out of 10 patients still survive to hospital discharge. Additional studies are warranted to identify strategies that will improve resuscitation outcomes in these patients.