Association of Life's Essential 8 and incident cardiac conduction disorder: a prospective cohort study

Aims This study aims to evaluate the effect of Life's Essential 8 (LE8), a comprehensive cardiovascular health (CVH) metric from the American Heart Association, on the risk of cardiac conduction disorders (CCDs).Methods and results We conducted a prospective cohort study of 112 160 adults from the UK Biobank, free of cardiovascular disease at baseline, to examine the association between LE8 scores and the risk of CCD. The LE8 scores were categorized into low (0-49), moderate (50-79), and high (80-100) CVH groups. Cox proportional hazards models were used to estimate the hazard ratios (HRs) and 95% confidence intervals (CIs) for CCD incidence during a median follow-up of 11.6 years. A total of 2760 CCD cases were identified. After adjustment for confounders, the high CVH group exhibited a significantly lower risk of CCD compared with the low CVH group (HR: 0.48, 95% CI: 0.40-0.56). Further analyses showed reduced risks for both severe conduction block (HR: 0.63, 95% CI: 0.51-0.78) and left bundle branch or fascicular block (HR: 0.35, 95% CI: 0.25-0.49) in the high CVH group. Restricted cubic spline regression revealed an L-shaped association between LE8 score and CCD risk. Among individual LE8 metrics, weighted quantile sum analysis revealed that body mass index (BMI) and sleep health were the major contributors to reduced CCD risk.Conclusion Higher LE8 scores were associated with a lower risk of CCD, including severe conduction block requiring pacemaker implantation and left bundle branch or fascicular block. Comprehensive strategies targeting optimal CVH, especially BMI and sleep health, may be beneficial for preventing CCD. Higher Life's Essential 8 (LE8) scores, which measure overall cardiovascular health, are associated with a lower risk of developing cardiac conduction disorders (CCDs). Individuals with higher LE8 scores have a significantly reduced risk of CCD, including severe conduction block and left bundle branch or fascicular block.Maintaining optimal cardiovascular health, particularly through weight management and good sleep health, may help prevent CCD and reduce related health complications.