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Background While arrhythmias are recognized as potential causes of death in chronic obstructive pulmonary disease (COPD) patients. However, temporal trends in arrhythmia-related mortality among COPD patients remain unexamined. Therefore, we conducted a comparative study evaluating mortality trends between atrial fibrillation (AF) and other arrhythmias in COPD patients.Methods A retrospective analysis of was conducted from 1999–2023, using the CDC WONDER database comparing COPD patients with AF (ICD-10: I48) versus other arrhythmias (ICD-10: I47, I49). Age-adjusted mortality rates (AAMRs) per 100,000 population were stratified by demographic variables for adults ≥25 years. Joinpoint regression estimated average annual percent changes (AAPC) in mortality trends.Results From 1999–2023, 537,088 COPD-AF deaths were recorded (280,378 Men; 256,710 Women). AAMRs increased significantly from 5.55 to 13.66 (AAPC: +3.87%). Conversely, 168,770 COPD patients with other arrhythmias died (96,472 Men; 72,298 Women), with AAMRs declining significantly from 5.19 to 2.04 (AAPC: -3.56%). Men consistently showed higher mortality rates in both COPD with AF and other arrhythmias. In COPD-AF, AAMRs increased significantly for both genders (p<0.000001): men (7.96 to 16.95; AAPC: +3.23%) and women (4.17 to 11.19; AAPC: +4.18%). Conversely, in the COPD with other arrhythmias cohort, mortality rates decreased significantly (p<0.000001) for both men (AAMR: 7.68 to 2.67; AAPC: -4.05%) and women (AAMR: 3.58 to 1.52; AAPC: -3.16%). Inpatient medical facilities were the most common place of death for both groups, though COPD-AF patients had fewer inpatient deaths (59,284) than those with other arrhythmias (190,982). Both cohorts showed a notable shift toward increased home deaths over the study period. Racially, Whites had the highest AAMRs in both groups (AF: 11.04; other: 3.32), followed by American Indians (AF: 8.18; other: 2.78). Regionally, the Midwest showed highest mortality with opposing trends: upward for AF (AAPC: +4.89%) and downward for other arrhythmias (AAPC: -3.30%) p<0.000001. At state level, Vermont had the highest COPD-AF mortality (AAMR: 16.33), while Ohio had the highest AAMR for other arrhythmias (5.20).Abstract S98 Figure 1Conclusion COPD-AF mortality increased dramatically while other arrhythmia mortality declined significantly. Men showed consistently higher mortality with notable demographic disparities. These opposing trends suggest AF represents an emerging threat requiring targeted interventions.