Background Atrial fibrillation (Afib) is a common cardiac manifestation of hyperthyroidism. The data regarding outcomes of Afib with and without hyperthyroidism are lacking. Hypothesis We hypothesized that patients with Afib and hyperthyroidism have better clinical outcomes, compared with Afib patients without hyperthyroidism. Methods We queried the National Inpatient Sample database for years 2015‐2017 using Validated ICD‐10‐CM codes for Afib and hyperthyroidism. Patients were separated into two groups, Afib with hyperthyroidism and without hyperthyroidism. Results The study was conducted with 68 095 278 patients. A total of 9 727 295 Afib patients were identified, 90 635 (0.9%) had hyperthyroidism. The prevalence of hyperthyroidism was higher in patients with Afib (0.9% vs 0.4%, P < .001), compared with patients without Afib. Using multivariate regression analysis adjusting for various confounding factors, the odds ratio of Afib with hyperthyroidism was 2.08 (CI 2.07‐2.10; P < .0001). Afib patients with hyperthyroidism were younger (71 vs 75 years, P < .0001) and more likely to be female (64% vs 47%; P < .0001) as compared with Afib patients without hyperthyroidism. Afib patients with hyperthyroidism had lower prevalence of CAD (36% vs 44%, P < .0001), cardiomyopathy (24.1% vs 25.9%, P < .0001), valvular disease (6.9% vs 7.4%, P < .0001), hypertension (60.7% vs 64.4%, P < .0001), diabetes mellitus (29% vs 32%, P < .0001) and obstructive sleep apnea (10.5% vs 12.2%, P < .0001). Afib with hyperthyroidism had lower hospitalization cost ($14 968 ± 21 871 vs $15 955 ± 22 233, P < .0001), shorter mean length of stay (5.7 ± 6.6 vs 5.9 ± 6.6 days, P < .0001) and lower in‐hospital mortality (3.3% vs 4.8%, P < .0001. The disposition to home was higher in Afib with hyperthyroidism patients (51% vs 42; P < .0001). Conclusion Hyperthyroidism is associated with Afib in both univariate and multivariate analysis. Afib patients with hyperthyroidism have better clinical outcomes, compared with Afib patients without hyperthyroidism.

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Introduction: Atrial fibrillation (Afib) is a common cardiac manifestation of hyperthyroidism. The data regarding outcomes of A fib with and without hyperthyroidism are lacking. Hypothesis: We hypothesized that patients with Afib and hyperthyroidism have better clinical outcomes, compared with Afib patients without hyperthyroidism. Methods: We queried National Inpatient Sample database for years 2015 - 2017 using Validated International Classification of Diseases and Clinical Modification (ICD-10-CM) codes for atrial fibrillation and hyperthyroidism. Patients were separated into 2 groups- A fib with hyperthyroidism and A fib without hyperthyroidism. Results: Study was conducted on 68,095,278 pateints. A total of 9,727,295 Afib patients were identified, out of which 90,635(0.9%) had hyperthyroidism. The prevalence of hyperthyroidism was higher in patients with Afib (0.9% vs 0.4%, p value <0.001), compared with patients without A fib. Using multivariate regression analysis after adjusting for various confounding factors, the odds ratio of Afib with hyperthyroidism was 2.08 (CI 2.07 - 2.10 P<.0001). Afib patients with hyperthyroidism were younger, (70.9 vs75.1 years, p<0.0001) and more likely to be female (63.9% vs 47% p<0.0001) as compared with Afib patients without hyperthyroidism. Afib patients with hyperthyroidism had lower prevalence of CAD (36.4% vs 43.8%,p<0.0001), cardiomyopathy(24.1% vs 25.9%,p<0.0001), valvular disease (6.9% vs 7.4%,p<0.0001), hypertension(60.7% vs 64.4%,p<0.0001) , and diabetes mellitus (28.9% vs 31.8%,p<0.0001). Afib with hyperthyroidism group had lower all-cause mortality (3.3% vs 4.8%, p<0.0001), shorter mean length of stay (5.7 ±6.6 vs 5.9±6.6 days,p<0.0001) and hospitalization cost ($14968±21871 vs $15955±22233, p<0.0001). The disposition to home was higher in Afib with hyperthyroidism patients (50.6% vs 41.8 p<0.0001). Conclusions: Presence of hyperthyroidism is associated with Afib in both univariate and multivariate analysis. Afib patients with hyperthyroidism have better clinical outcomes, compared with Afib patients without hyperthyroidism.