Racial Disparity in Referral for Catheter Ablation for Atrial Fibrillation at a Single Integrated Health System

Association of Child Opportunity Index with Outcomes in Pediatric Supraventricular Tachycardia

To assess the relationship between the Child Opportunity Index (COI), a validated measure that uses 29 indicators of social determinants of health linked to the US Census, and pediatric supraventricular tachycardia (SVT) management and outcomes, specifically looking at utilization of ablation. A retrospective, single-center study was performed evaluating pediatric SVT patients from January 2018 to July 2023. Patients diagnosed at < 5 years old, with pre-excitation, and with hemodynamically significant congenital heart disease were excluded. Characteristics were compared among low, moderate, and high COI categories using Kruskal-Wallis tests for continuous variables, and chi-square or Fisher's exact tests for categorical variables. Logistic regression and log-normal regression models were used to assess the relationship between COI category and primary outcomes of interest among SVT patients. A cohort of 306 patients met inclusion criteria. 45% had a high COI, 29% a moderate COI, and 26% a low COI. The odds of having one or more SVT-related hospital admissions were 3.88 times greater for the low COI patients compared to high COI patients (95% CI 1.39-10.8, p = 0.010). COI was not found to be associated with any other primary outcomes of interest, including utilization of ablation. Lower COI was associated with greater odds of admission in SVT patients but did not differ in rates of ablation or outcomes. This suggests social factors may affect resource utilization while having limited impact on treatments like ablations.

Sex disparity in referral for catheter ablation for atrial fibrillation

BACKGROUND

Catheter ablation for atrial fibrillation (AFCA) has been shown to reduce AF burden and improve quality of life. Earlier studies demonstrated that women are less likely to undergo AFCA despite having more AF symptoms. We investigated whether an association exists between referral patterns and this sex disparity.

METHODS

A retrospective cohort study was conducted of outpatients with newly diagnosed AF at a single tertiary referral center. Logistic regression models adjusted for socioeconomic and clinical factors were constructed to determine associations between sex and binary dependent variables including referrals to and visits with general cardiology and electrophysiology (EP) and AFCA utilization.

RESULTS

Of 6850 patients analyzed, 2693 were women, and 4157 were men. No significant differences were found in odds of referral to (aOR, 1.13 [0.92-1.40], P = 0.25) or visits with (aOR, 1.05 [0.86-1.29], P = 0.62) general cardiologists between women and men. Women were found to be less likely to visit with EP than men (aOR, 0.88 [0.79-0.99], P = 0.03). In analyses of referral patterns after release of the 2014 AHA/ACC/HRS guidelines, women were found to be referred to (aOR, 0.78 [0.63-0.95], P = 0.01) and visit with (aOR, 0.86 [0.75-0.99], P = 0.03) EP less frequently than men. Finally, no significant difference was found in likelihood to undergo AFCA between women and men (aOR, 1.05 [0.83-1.33], P = 0.67).

CONCLUSIONS

This study uncovered significant differences in rates of referral to and visits with EP between women and men. Encouraging equitable referral to specialists and access to AFCA is essential in ensuring appropriate care for all patients.

Social drivers in atrial fibrillation occurrence, screening, treatment, and outcomes: systematic-narrative hybrid review

The importance of social drivers of health (SDOH) in the occurrence, detection, treatment, and outcome of atrial fibrillation (AF) has attracted increasing attention. Addressing SDOH factors may suggest opportunities to prevent AF and its complications. We aimed to conduct a structured narrative review and summarize current knowledge on the association between race and ethnicity, SDOH, including rural vs. urban habitation, education, income, and neighbourhood, and the risk of AF, its management, and complications. We identified 537 references in PubMed and 473 references in Embase. After removal of duplicates, we screened the abstracts of 975 references, resulting in 113 references that were examined for eligibility. Subsequently, 34 references were excluded leaving 79 references for the review. Evidence of a social gradient in AF incidence and prevelance were conflicting. However, we found substantial evidence indicating social inequities in the detection of AF, access to treatment, and outcomes such as healthcare utilization, bleeding, heart failure, stroke, dementia, work disability, and death. Inequities are reported across various health care systems and constitute a global problem affecting several continents, although data from Africa and South America are lacking. Given the documented social inequities in AF detection, management, and outcomes, there is an urgent need for healthcare systems, policymakers, and society to identify and implement effective interventions that can reduce inequities and improve outcomes in individuals with AF.

Racial and Ethnic Differences in Initiation and Discontinuation of Antiarrhythmic Medications in Management of Atrial Fibrillation

Background

Atrial fibrillation (AF) is associated with considerable morbidity and mortality. Timely management and treatment are critical in alleviating AF disease burden. There is significant heterogeneity in patterns of AF care. It is unclear whether there are racial and ethnic differences in treatment of AF following antiarrhythmic drug (AAD) prescription.

Methods

Using the Optum Clinformatics Data Mart-Socioeconomic Status database from January, 2009, through March, 2022, multivariable logistic regression techniques were used to examine the impact of race and ethnicity on rate of AAD initiation, as well as receipt of catheter ablation within two years of initiation. We compared AAD discontinuation rate by race and ethnicity groups using Cox regression models. Log-rank analyses were used to examine the rate of AF-related hospitalization.

Results

Among 143,281 patients identified with newly diagnosed AF, 30,019 patients (21%) were initiated on an AAD within 90 days. Patients identified as Non-Hispanic Black (NHB) were significantly less likely to receive an AAD compared to Non-Hispanic White patients (NHW) (Odds Ratio [OR] 0.90, 95% confidence interval [CI] 0.85-0.94). Compared to NHW, Hispanic (Hazard Ratio [HR] 1.08, 95% CI 1.02-1.14) and Asian patients (HR 1.17, 95% CI 1.06-1.29) have a higher rate of AAD discontinuation. Following AAD initiation, NHB patients were significantly more likely to have an AF-related hospitalization (p < 0.01). However, NHB patients were significantly less likely to receive ablation compared to NHW (HR 0.83, 95% CI 0.70-0.97), and less likely to change AAD (p < 0.01).

Conclusion

Patients identified as NHB are 10% less likely to receive an AAD for treatment of newly diagnosed AF. Compared to NHW, Hispanic and Asian patients were more likely to discontinue AAD treatment. Once initiated on an AAD, NHB patients were significantly more likely to have an AF -related hospitalization, but were 17% less likely to receive ablation compared to NHW patients. The etiology of, and interventions to reduce, these disparities require further investigation.

Outcomes of a Remote Cardiac Rehabilitation Program for Patients Undergoing Atrial Fibrillation Ablation: Pilot Study

BACKGROUND

Risk factor modification, in particular exercise and weight loss, has been shown to improve outcomes for patients with atrial fibrillation (AF). However, access to structured supporting programs is limited. Barriers include the distance from appropriate facilities, insurance coverage, work or home responsibilities, and transportation. Digital health technology offers an opportunity to address this gap and offer scalable interventions for risk factor modification.

OBJECTIVE

This study aims to assess the feasibility and effectiveness of a 12-week asynchronous remotely supervised exercise and patient education program, modeled on cardiac rehabilitation programs, in patients with AF.

METHODS

A total of 12 patients undergoing catheter ablation of AF were enrolled in this pilot study. Participants met with an exercise physiologist for a supervised exercise session to generate a personalized exercise plan to be implemented over the subsequent 12-week program. Disease-specific education was also provided as well as instruction in areas such as blood pressure and weight measurement. A digital health toolkit for self-tracking was provided to facilitate monitoring of exercise time, blood pressure, weight, and cardiac rhythm. The exercise physiologist remotely monitored participants and completed weekly check-ins to titrate exercise targets and provide further education. The primary end point was program completion. Secondary end points included change in self-tracking adherence, weight, 6-minute walk test (6MWT), waist circumference, AF symptom score, and program satisfaction.

RESULTS

The median participant age was 67.5 years, with a mean BMI of 33.8 kg/m2 and CHADs2VASC (Congestive Heart Failure, Hypertension, Age [≥75 years], Diabetes, Stroke/Transient Ischemic Attack, Vascular Disease, Age [65-74 years], Sex [Female]) of 1.5. A total of 11/12 (92%) participants completed the program, with 94% of expected check-ins completed and 2.9 exercise sessions per week. Adherence to electrocardiogram and blood pressure tracking was fair at 81% and 47%, respectively. Significant reductions in weight, waist circumference, and BMI were observed with improvements in 6MWT and AF symptom scores (P<.05) at the completion of the program. For program management, a mean of 2 hours per week or 0.5 hours per patient per week was required, inclusive of time for follow-up and intake visits. Participants rated the program highly (>8 on a 10-point Likert scale) in terms of the impact on health and wellness, educational value, and sustainability of the personal exercise program.

CONCLUSIONS

An asynchronous remotely supervised exercise program augmented with AF-specific educational components for patients with AF was feasible and well received in this pilot study. While improvements in patient metrics like BMI and 6MWT are encouraging, they should be viewed as hypothesis generating. Based on insights gained, future program iterations will include particular attention to improved technology for data aggregation, adjustment of self-monitoring targets based on observed adherence, and protocol-driven exercise titration. The study design will need to incorporate strategies to facilitate the recruitment of a diverse and representative participant cohort.