Abstract Body (Do not enter title and authors here): Introduction: Supraventricular tachycardia (SVT) is known to affect children and teenagers predominantly but can also occur in adults. However, due to a presumed good disease outcome, fatality rates of SVT in adults (above 25 years) are yet to be explored.
Aim: This study aims to shed light on the mortality trends of SVT in the adult population across the United States from 1999 to 2020.
Methodology: The CDC WONDER database was used to identify SVT-related deaths using ICD-10 code I47.2 in adults (above 25 years) from 1999 to 2020. The reported data was in the form of crude rate and age-adjusted mortality rate (AAMR) per 100,000 individuals and was stratified by year, ten-year age groups, gender, races, census region, census division, states, and rural-urban division. The Joinpoint regression was then used to determine the changes in trends and annual percentage change (APC).
Results: From1999 to 2020, 31,036 (AAMR=0.6) SVT-related deaths were reported. AAMR showed an initial steep decline from 0.9 in 1999 to 0.5 in 2011 (APC -5.11 [95% CI -6.08 to -4.14]), followed by a gradual increase till 2020 (0.8) (APC 5.14 [95% CI 3.41 to 6.90]). The crude death rates increased with age and were reported to be highest in ages greater than or equal to 85 (9.1); the trend showed a steep decrease from 1999 (12.4) to 2008 (7.9) (APC -4.35 [95% CI -5.36 to -3.33]), followed by a gradual decline till 2017 (7.8) (APC -0.66 [95% CI -2.04 to 0.73]), and ultimately rising sharply till 2020 (10.6) (APC 9.23 {95% CI 3.32 to 15.47]). Among races, Blacks and Whites displayed the highest mortality (0.7). Blacks showed an initial decrement from 1999 (1.0) to 2017 (0.6) (APC -2.71), followed by a rise back to 1.0(2020) (APC 19.58), while whites showed an initial fall (0.9 (1999) to 0.6 (2008), APC -4.91), followed by no change till 2017 (APC 0.18), and ultimately rise to 0.9 in 2020 (APC 13.66). Although no significant gender or geographical variations were observed, more deaths were seen in rural areas (1.0) than in Urban (0.6).
Conclusion: Following an initial decline, the incidence of SVT-related mortality has been increasing over the years, pre-dominantly among the 85+ age group, Blacks, and rural populations. However, due to a limited understanding of the epidemiology of SVT in adult populations, more extensive research is needed to formulate better preventive and management strategies.