Heart Failure
Incidence and Survival of Hospitalized Acute Decompensated Heart Failure in Four US Communities (from the Atherosclerosis Risk in Communities Study)

https://doi.org/10.1016/j.amjcard.2013.10.032Get rights and content

Most population-based estimates of incident hospitalized heart failure (HF) have not differentiated acute decompensated heart failure (ADHF) from chronic stable HF nor included racially diverse populations. The Atherosclerosis Risk in Communities Study conducted surveillance of hospitalized HF events (age ≥55 years) in 4 US communities. We estimated hospitalized ADHF incidence and survival by race and gender. Potential 2005 to 2009 HF hospitalizations were identified by International Classification of Diseases, Ninth Revision, Clinical Modification, codes; 6,168 records were reviewed to validate ADHF cases. Population estimates were derived from US Census data; 50% of eligible hospitalizations were classified as ADHF, of which 63.6% were incident ADHF and 36.4% were recurrent ADHF. The average incidence of hospitalized ADHF was 11.6 per 1,000 persons, aged ≥55 years, per year, and recurrent hospitalized ADHF was 6.6 per 1,000 persons/yr. Age-adjusted annual ADHF incidence was highest for black men (15.7 per 1,000), followed by black women (13.3 per 1,000), white men (12.3 per 1,000), and white women (9.9 per 1,000). Of incident ADHF events with heart function assessment (89%), 53% had reduced the ejection fraction (heart failure with reduced ejection fraction [HFrEF]) and 47% had preserved ejection fraction (heart failure with preserved ejection fraction [HFpEF]). Black men had the highest proportion of acute HFrEF events (70%); white women had the highest proportion of acute HFpEF (59%). Age-adjusted 28-day and 1-year case fatality after an incident ADHF was 10.4% and 29.5%, respectively. Survival did not differ by race or gender. In conclusion, ADHF hospitalization and HF type varied by both race and gender, but case fatality rates did not. Further studies are needed to explain why black men are at higher risk of hospitalized ADHF and HFrEF.

Section snippets

Methods

The 4 ARIC study communities include Forsyth County, North Carolina; Jackson, Mississippi; Minneapolis, Minnesota; and Washington County, Maryland. Average gender- and race-specific population estimates for each study community were computed for 2005 to 2009 by extrapolations from the 2000 and 2010 US censuses. The estimated population size aged ≥55 years were Forsyth County, 395,782 (20.8% black); Jackson, 171,241 (60.9% black); Minneapolis suburbs, 253,225; and Washington County, 174,414.

Results

Of the 42,413 HF-eligible hospitalizations, 41.2% were validated as ADHF, 9.0% as chronic HF, and 49.8% were classified as no HF; the most common ICD-9-CM discharge code was 428.xx (congestive HF, 89.1%). Of the validated hospitalized HF events, 82% were ADHF; 76.7% had either previous outpatient diagnosis of HF (73.4%) or treatment for HF (64.9%).

Of hospitalized ADHF events, 63.6% were incident hospitalized ADHF (53.2% of which had previous HF diagnosis) and 36.4% were recurrent events.

Discussion

We found that ADHF hospitalization rates and HF type varied by race and gender, whereas CF did not. The ARIC study is unique because it differentiates ADHF from chronic stable HF, contributing more specificity than older classification criteria (e.g., Framingham) and ICD-9-CM codes.5 In addition, the ARIC communities are relatively racially diverse allowing for evaluation of event rates among whites and blacks. Black men had the highest incidence and recurrence rates of hospitalized ADHF,

Acknowledgment

The authors thank the staff and participants of the ARIC study for their important contributions.

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    The Atherosclerosis Risk in Communities Study is carried out as a collaborative study supported by National Heart, Lung, and Blood Institute (Bethesda, Maryland) contracts (HHSN268201100005 C, HHSN268201100006 C, HHSN268201100007 C, HHSN268201100008 C, HHSN268201100009 C, HHSN268201100010 C, HHSN268201100011 C, and HHSN268201100012 C).

    See page 509 for disclosure information.

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