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Abstract Number: 219

Impact of Rheumatoid Arthritis on Influenza-Related Complications: A Population Based Cohort Study

Preethi Gondi Kamma Venkatesh1 and Xiang Zhu2, 1Internal Medicine, Florida Hospital, Orlando, FL, 2Florida Hospital, Orlando, FL

Meeting: 2018 ACR/ARHP Annual Meeting

Keywords: morbidity and mortality and rheumatoid arthritis (RA)

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Session Information

Date: Sunday, October 21, 2018

Session Title: Epidemiology and Public Health Poster I: Rheumatoid Arthritis

Session Type: ACR Poster Session A

Session Time: 9:00AM-11:00AM

Background/Purpose: Rheumatoid Arthritis (RA) is associated with increased incidence of seasonal influenza and its complications. Population-based studies on outcomes are lacking. The aim of our study was to evaluate the impact of RA on in-hospital mortality, length of stay, and hospitalization costs in patients with influenza.

Methods: We examined National Inpatient Sample data from 2000-2012. We performed a case-control study in which we included all discharges with influenza as primary diagnosis and RA (ICD 9 coded as 714.xx) as secondary diagnosis as cases (discharges with any comorbidities were excluded); while those with influenza as primary diagnosis and no comorbidities including RA as controls. The main outcomes included in-hospital mortality, length of stay, and hospitalization costs to study the impact of RA on influenza patients.

Results: A total of 1097 discharges had influenza as the primary diagnosis for admission. A total of 543 patients had influenza with RA (study group), and 554 had influenza without RA (control group). (Table 1) Both the groups who had any comorbidities listed as a secondary diagnosis were excluded to exclude the impact of other comorbidities on outcomes. There was no difference in mortality in patients with influenza with or without RA (0.5% vs 0.2%, P = .31). However, patients with influenza and RA had increased length of hospital stay (3.8 vs 2.1 days, P < .001), and higher hospitalization costs ($15,826 vs $5,953, P < .001). On multivariate analysis, RA was independently associated with increased hospital stay and higher hospitalization costs; but not mortality.

Conclusion: RA appears to be associated with increased length of stay and hospitalization costs in patients with influenza.

Factor

Discharges of Influenza only (N=554)

Discharges of Influenza +RA (N=543)

P value
Age 44.5(20.3) 67.6(14.9) < 0.001

Gender

Male (%)

241(43.5)

125(23.0)

<0.001

Female (%) 313(56.5) 418(77.0)
Length of stay (days) 2.1(1.6) 3.8(2.8) <0.001
Total Charges ($) 6263.2(5952.8) 14137(15826) <0.001
Mortality (%) 1(0.18) 3(0.55) 0.306

Disclosure: P. G. K. Venkatesh, None; X. Zhu, None.

To cite this abstract in AMA style:

Venkatesh PGK, Zhu X. Impact of Rheumatoid Arthritis on Influenza-Related Complications: A Population Based Cohort Study [abstract]. Arthritis Rheumatol. 2018; 70 (suppl 9). https://acrabstracts.org/abstract/impact-of-rheumatoid-arthritis-on-influenza-related-complications-a-population-based-cohort-study/. Accessed February 6, 2023.
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