Pulmonary hypertension associated mortality in the United States from 2003 to 2020: an observational analysis of time trends and disparities

Background: Pulmonary hypertension (PH) is an independent risk factor for morbidity and mortality. In the last two decades, significant advances have been made in management of World Health Organization (WHO) group 1 PH. However, there are no approved targeted pharmacotherapies for PH secondary to left-sided heart diseases or chronic hypoxic lung diseases which are thought to account for more than 70-80% of the disease burden. No recent investigation has analyzed and compared the mortality burden related to WHO group 1 PH with the mortality burden with WHO groups 2-5 PH at the national level in the United States (US). We hypothesize that WHO group 1 PH-related mortality has improved over the last two decades in comparison to WHO groups 2-5 PH.

Methods: In this study, we used data from the Centers for Disease Control and Prevention Wide-ranging Online Data for Epidemiologic Research (CDC WONDER) the underlying cause of death database to study age-standardized mortality rates related to PH in the US from 2003 to 2020.

Results: A total of 126,526 deaths were recorded from PH in the US between 2003 and 2020. Across the study period, PH-related ASMR increased from 17.81 per million population in 2003 to 23.89 in 2020 with a percentage change (PC) of +34%. However, there are contrasting mortality trends in WHO group 1 PH when compared to WHO groups 2-5 PH. Data demonstrated a decline in mortality from group 1 PH regardless of gender. In contrast, an increase in mortality from WHO groups 2-5 PH was observed, accounting for the major proportion of the overall PH mortality burden in recent years.

Conclusions: PH-related mortality continues to an increase primarily due to increase in mortality attributed to WHO groups 2-5 PH. These findings have notable public health implications. Screening and risk assessment tools for secondary PH, risk factor modification, and novel management strategies are vital to improve outcomes.