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ACC 2026 Late-Breaking Trials
Live trial results, expert commentary, and discussion with 10+ trial authors
This scientific statement highlights the need for guidance on managing acute decompensated heart failure in children, suggesting significant knowledge gaps.
this topic is critically important because these children often have the longest and most complex hospital stays with limited options. Improved therapies can impact young lives for decades and affect quality of life for the whole family.
Does discontinuation of OAC after successful catheter ablation for atrial fibrillation safely prevent thromboembolic events compared to continued therapy?
Result: The incidence of thromboembolic events in patients who discontinued OAC after successful ablation remained low, though evaluation of net clinical benefit was limited by a low number of events.
Result: From baseline to 6 months, changes in KCCQ-OSS and 6MWD showed modest correlations with core lab-assessed LVEF (r=0.39; 95% CI: 0.16-0.58; p=0.0015 and r=0.39; 95% CI: 0.15-0.58; p=0.0022, respectively).
Does surgical mitral valve replacement in rheumatic heart disease patients yield similar one-year mortality compared to non-rheumatic heart disease patients and across different center volumes?
Result: One-year mortality did not differ significantly between RHD (6.4%) and non-RHD (13.8%) MVR patients (HR: 0.80; 95% CI 0.53-1.21; p=0.288).
Result: Summarizes 2025 advances in cardiovascular pharmacotherapy, including 4 new drug approvals (aficamten, etripamil, lerodalcibep, plozasiran), label expansions, major RCT results, and the withdrawal of Andexanet-alfa.
Does once-weekly tirzepatide reduce cardiovascular events compared to dulaglutide in patients aged ≥40 years with type 2 diabetes mellitus and established ASCVD?
Result: The primary composite endpoint occurred in 12.2% of patients treated with tirzepatide and 13.1% of those treated with dulaglutide (HR 0.92, 95.3% CI: 0.83–1.01), meeting non-inferiority (P = 0.003) but not superiority (P = 0.09).
What are the mechanisms and consequences of vertical transmission of Group B Coxsackieviruses from mother to infant?
Result: Vertical transmission of CV-B can occur through transplacental passage or inhalation during delivery, leading to serious consequences including abortion, stillbirth, congenital malformations, and neonatal morbidity and mortality.

“Vertical Transmission of Type B Coxsackieviruses: A Systematic Review Emphasising Clinical Evidence and Seriousness of a Neglected Issue #enteroviruses 👇 https://t.co/Si6R9cLjIg”
Result: Round 1 showed 50% of items with I-CVIs <0.78 (S-CVI/AVE=0.77), prompting revisions, and final I-CVIs exceeded 0.78 for >95% of items.

“We developed a system for early detection of heart failure exacerbation regardless of healthcare professional experience.Content validity was achieved I-CVI>0.78 for >95% of items. By Motohiro Sano @boso_chf_2023 https://t.co/fT7YlxLx1x #circ_rep #CardioX https://t.co/3S7siPWdVH”
Does Monte Carlo Propagation improve the precision of ventricular tachycardia ablation target prediction compared to deterministic models in patient-specific cardiac models?
Result: MCP improved top-10 precision by 40.0 percentage points (0.967 vs. 0.567) and achieved an AUC of 0.966 compared to 0.500 for the deterministic baseline.
Does pericoronary adipose tissue (PCAT) attenuation differ between culprit and non-culprit lesions in patients with acute coronary syndrome?
Result: PCAT attenuation was significantly higher around culprit sites compared to non-culprit sites (MD 4.95 HU, 95% CI 2.62-7.27, p < 0.001, I²=89%).