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Published on: August 8, 2022
Stable Rates of Obstructive Hypertrophic Cardiomyopathy in a Contemporary Era
Michael Butzner1, Douglas L Leslie1, Yendelela Cuffee1,2
1Department of Public Health Sciences, Pennsylvania State College of Medicine, Hershey, PA, United States.
Insights
Obstructive hypertrophic cardiomyopathy (oHCM) affects 1.65 per 10,000 individuals in the US. Most privately insured oHCM patients remain undiagnosed, highlighting a need for improved clinical identification.
Area of Science:
- Cardiology
- Genetics
- Epidemiology
Background:
- Hypertrophic cardiomyopathy (HCM) is the most prevalent genetic heart disease in the US.
- The clinical recognition of obstructive hypertrophic cardiomyopathy (oHCM) remains poorly understood.
Purpose of the Study:
- To estimate the annual prevalence of clinically diagnosed oHCM in the US between 2016 and 2018.
- To identify demographic disparities in oHCM diagnosis.
Main Methods:
- Utilized the MarketScan® database from 2016-2018.
- Identified patients with International Statistical Classification of Disease and Related Health Problems code I42.1 (oHCM).
- Calculated and stratified oHCM prevalence by sex and age.
Main Results:
- In 2016, oHCM prevalence was 1.65 per 10,000, with higher rates in males (2.07) than females (1.26).
- Prevalence increased with age, peaking in the 55-64 age group (4.82 per 10,000).
- Prevalence remained stable from 2016-2018 across demographic groups.
Conclusions:
- The study indicates a significant underdiagnosis of oHCM among privately insured individuals in the US.
- Findings underscore the necessity for enhanced clinical identification strategies and further research into oHCM.
Abstract:
Hypertrophic cardiomyopathy is the most common genetic heart disease in the US, with an estimated prevalence of 1 in 500. However, the extent to which obstructive hypertrophic cardiomyopathy is clinically recognized is not well-established. Therefore, the objective of this study was to estimate the annual prevalence of clinically diagnosed oHCM in the US from 2016 to 2018. Data from the MarketScan® database were queried from years 2016 to 2018 to identify patients with ≥1 claim of oHCM (International Statistical Classification of Disease and Related Health Problems diagnosis code: I42.1). Prevalence rates for oHCM were calculated and stratified by sex and age. In 2016, 4,612 unique patients had clinical diagnosis of oHCM, resulting in an estimated oHCM prevalence of 1.65 per 10,000. The prevalence of oHCM in males and females was 2.07 and 1.26, respectively. Prevalence of oHCM was highest in patients 55-64 years of age (4.82). Prevalence of oHCM generally increased with age, from 0.36 per 10,000 in those under 18 to 4.82 per 10,000 in those 55-65. Trends in prevalence of oHCM over time, including by sex and age group, remained similar and consistent in 2017 and 2018. The prevalence of oHCM was stable over the 3-year time period, including higher rates of oHCM in males and patients aged 55-64 years. These results suggest that the majority of privately insured patients with oHCM are undiagnosed in the US and reinforce the need for policies and research to improve the clinical identification of oHCM patients in the US.
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