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Background: Though studied in several countries worldwide, the effects of seasonal variations in heart failure (HF) admissions and mortality in the United States (US) have not been well described. We aim to investigate regional, or seasonal variations in HF admissions and in-hospital mortality in the US.
Methods: HF hospitalizations from 01/01/2002 to 12/31/2011 were obtained using the nationwide inpatient sample. Analyses were performed to determine seasonal and yearly trends of HF admissions and in-hospital mortality. Comparisons were made between 4 regions: Northeast, Midwest, South and West. Standard statistical methods were utilized.
Results: A total of 1,990,432 admissions were included which comprised of 48.9% males, 69% Caucasians, 18.5% African Americans, and 8.2% Hispanics. Mean age at admission was 72 ± 14 years. Mean length of stay was 5.24 ± 5.74 days. Overall, the maximum HF admissions were noted in January & February, whereas the least number of admissions were noted in August followed by September. Region based analysis showed maximum admissions between December and March in all 4 regions. State-wise analysis of total admissions data indicated highest HF admissions in Florida (9.3%) and California (9.1%); where as North Dakota and Wyoming saw the least (<0.1%). Maximum overall admissions were noted in the South, though highest mortality was noted in the Northeast (4.3%). Mortality rates during hospitalization in the remaining 3 regions were Midwest 3.6%, South 3.7%, and West 3.8 %, with the national average being 3.8 %. Month based analysis of mortality data across the nation between 2002-2011 revealed highest mortality in January and February at 4.2 % and 4.2% as compared to the rest of the year. Lowest mortality was noted in August (3.5%).
Conclusions: To the best of our knowledge, our study is the first to analyze seasonal variations in HF admissions and mortality in the US. A substantial variation in HE admissions within different regions was noted, however, an increasing trend in admissions and mortality was observed in all 4 regions, irrespective of the temperatures. Extra caution is advisable in chronic heart failure patients in winter months, particularly in the Northeast region.
Poster Hall, Hall C
Friday, March 17, 2017, 3:45 p.m.-4:30 p.m.
Session Title: Acute Heart Failure: Evaluating Strategies to Prevent Readmissions
Abstract Category: 13. Heart Failure and Cardiomyopathies: Clinical
Presentation Number: 1163-257
- 2017 American College of Cardiology Foundation