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PUBLIC RELEASE DATE:
18-May-2014

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Contact: Nathaniel Dunford
ndunford@thoracic.org
American Thoracic Society

COPD patients at significantly higher risk of heart failure

ATS 2014, SAN DIEGO ─ As if increased risks of high blood pressure, respiratory infections, lung cancer and even depression weren't enough, researchers say patients with chronic obstructive pulmonary disease (COPD) have another complication to worry about: heart failure. That's according to a new study from the Morehouse School of Medicine in Atlanta, which found the prevalence of heart failure is significantly higher in patients with COPD compared to the rest of the study population. They also found that the risk was especially high among African-American patients with COPD.

The study's findings were presented at the ATS 2014 International Conference.

"The relationship between COPD and coronary heart disease has been well studied, but substantially less information exists concerning the coexistence of COPD and heart failure," said lead author Srinadh Annangi, MBBS. "For our study, we analyzed hospital discharge data from the National Hospital Discharge Survey (NHDS) to investigate the frequency and impact of heart failure on hospitalizations for subjects with COPD."

The researchers reviewed 386,186,183 hospital discharge records from 2001 through 2010 and identified 33,338,505 patients aged 40 years and over who had COPD. Those records were further analyzed to identify patients who also had heart failure, and then stratified by race and age.

After analysis, they found that 28.7% of COPD patients had heart failure, compared to 13.0% in the background population. Looking at race, the researchers reported the following findings:

With regard to age, they found:

The researchers also found that patients with both COPD and heart failure had longer average hospital stays, higher in-hospital mortality rates and were discharged to long-term care facilities more often than patients with COPD alone.

"The co-existence of COPD and heart failure, which share common symptoms, may pose diagnostic and therapeutic challenges," said study corresponding author Marilyn G. Foreman, M.D., M.S. "The long-term effect of both diagnoses over time remains to be determined."

"As the prevalence of COPD gains traction in individuals of low socioeconomic status, the impact of simultaneous co-morbid diagnoses over decades of life could pose substantial fiscal, therapeutic, and social challenges," she added.

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* Please note that numbers in this release may differ slightly from those in the abstract. Many of these investigations are ongoing; the release represents the most up-to-date data available at press time.

Abstract 49375

Chronic Obstructive Pulmonary Disease And Heart Failure - A Decade Analysis Of The National Hospital Discharge Survey
Type: Scientific Abstract
Category: 09.03 - COPD: Comorbidities (CP)
Authors: S. Annangi, M.G. Foreman, E.L. Flenaugh; Morehouse School of Medicine - Atlanta, GA/US

Abstract Body

Introduction:

Chronic obstructive pulmonary disease (COPD) is a global health issue. The relationship between COPD and coronary heart disease has been well studied but substantially less information exists concerning the coexistence of COPD and heart failure. We analysed hospital discharge data from the National Hospital Discharge Survey (NHDS) to investigate the frequency and impact of heart failure on hospitalizations for subjects with COPD.

Methods:

We performed a retrospective population-based study using data for the period 2001 to 2010. International Classification of Diseases, Ninth revision (ICD – 9) coding was used to identify COPD (ICD9 codes 490, 491, 492, 496) and heart failure cases (ICD9 codes 428.0 to 428.9). Adults aged ≥ 40 years were included in the study. COPD cases were initially identified by extracting hospitalizations with any listing for COPD. Cases were stratified according to race and age groups for further analysis. Percentages obtained from descriptive statistics were analysed for statistical significance using the Chi-square test.

Results:

33,140,775 COPD cases (10.6%) were identified from a total of 311,859,230 discharges over the 10-year period. Hospitalized subjects were older and predominantly white (Table-1). The prevalence of heart failure was 27.3% in COPD cases compared to 15.3% in the background population (P<0.0001). Stratified by race, the prevalence of heart failure in COPD cases compared to the background population was 26.8% vs. 15.3% in European Americans (P<0.0001), 33.1% vs. 17.1% for African Americans (P<0.0001), 23.7% vs. 12.4% in others races (P<0.0001) and 27.4% vs. 14.8% in cases where race was not reported (P<0.0001). The same prevalence according to age groups was 6.4% vs. 16.9% (P<0.0001) for 40 - 59 years, 16.1% vs. 26.1% (P<0.0001) for 60 - 79 years, and 26.7% vs. 36.8% (P<0.0001) for 80 years and above. Compared to cases with COPD alone, cases with COPD and heart failure had longer average length of stay (6.4 days vs. 5.6 days, P < 0.0001), higher in-hospital mortality (5.6% vs. 3.6%, P < 0.0001), and more frequent discharges to long term care facilities (21.2% vs. 15.7%, P < 0.0001).

Conclusion:

The prevalence of heart failure is significantly higher in patients with COPD compared to the background population. African American patients with COPD had the highest prevalence of heart failure compared to all other races, regardless of age group. COPD patients hospitalized with a concurrent diagnosis of heart failure had higher mortality, longer average length of stay, and greater need for long-term care.

Table-1: Characteristics and prevalence of heart failure for COPD patients, 2001 to 2010, by race:

Characteristics White/ European American (23,289,208) Black / African American (2,520,063 Other race (623,655) No reported race(6,707,849)
Mean Age, Years (±SD) 71 (±12) 67 (±13) 72(±12) 72 (±12)
Male (%) 48.7 50.5 57.7 50.0

Prevalence of heart failure by age groups (%)
Age 40 - 59 15.5 27.1 17 15.2
Age 60 - 79 25.4 34.6 23.5 26
Age ≥ 80 36.6 38.9 28 38



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