Studying a heart rhythm procedure during open-chest heart surgery in adults
Studies a surgical procedure for atrial fibrillation in adults having heart surgery.
Plain-language title generated from the registry record
Registry title: Isolation of Pulmonary Veins Using the Box Technique in Patients Undergoing Sternotomy
Key facts
- Where
- Nantes, FranceSee the site
Where in France
- CHU de NantesNantes, FranceNo longer taking part
Questions to ask the study team
- How often do I need to come in, and for how long each time?
- Are travel costs paid?
- Can I keep my own doctor?
- What happens if I want to stop?
Trial details
- Who runs it
- Nantes University Hospital
- Trial code
- NCT07312149
- Record updated
- 24 June 2026
- Original description
Atrial Fibrillation (AF) is the most common cardiac arrhythmia worldwide, affecting approximately 2.8% of the population, with prevalence increasing with age. AF is associated with significant morbidity and mortality, accounting for about 25% of ischemic strokes, 10% of cryptogenic strokes, and a 10-40% annual increase in hospital admissions due to heart failure or anticoagulant-related events.Read full original descriptionShow less
BoxTer : Isolation of Pulmonary Veins Using the Box Technique in Patients Undergoing Sternotomy
Atrial Fibrillation (AF) is the most common cardiac arrhythmia worldwide, affecting approximately 2.8% of the population, with prevalence increasing with age. AF is associated with significant morbidity and mortality, accounting for about 25% of ischemic strokes, 10% of cryptogenic strokes, and a 10-40% annual increase in hospital admissions due to heart failure or anticoagulant-related events.
About 10% of patients undergoing cardiac surgery have preoperative AF. In 1986, Dr. Cox introduced the MAZE procedure, a surgical technique to isolate AF triggers. Initially involving atrial incisions, it evolved to use radiofrequency lines, significantly reducing morbidity and mortality. The MAZE procedure is now strongly recommended (Class Ia evidence) for concomitant cardiac surgery. However, nearly 85% of eligible patients-especially those undergoing closed-chest cardiac surgery-do not receive this treatment due to technical challenges and limited reproducibility of the Cox-Maze IV technique.
Pulmonary Vein Isolation (PVI) with posterior wall isolation (PWI-Box) has emerged as an effective alternative, offering similar outcomes to Cox-Maze IV with fewer adverse effects. Innovative devices like the GeminiS (Medtronic) enable minimally invasive, thoracoscopic PVI-PWI-Box procedures without opening the heart, even off-pump. This approach could expand the use of AF ablation during combined sternotomy surgeries, aligning with clinical guidelines.
Primary Objective: Assess the efficacy of PWI-Box using GeminiS combined with other cardiac surgeries via sternotomy.
Primary Endpoint: Recurrence rate of paroxysmal or persistent AF (per ESC definition) at 1 year postoperatively, confirmed by 24-hour Holter monitoring.
Inclusion: Patients undergoing cardiac surgery via sternotomy; Concomitant use of the PWI box with GeminiS during surgery; Adult patients; Patients with the following characteristics: Preoperative paroxysmal/persistent/permanent AF; Duration of less than 5 years; And left atrium volume <60 ml/m2; Informed patient who did not object to the collection of their data for the study.
Exclusion: Unplanned surgery (emergency); Patients currently taking medication or using an experimental device that clinically interferes with the study's evaluation criteria and results; History of cardiac surgery (reoperation); Pregnant or breastfeeding women; Adults under guardianship, curatorship or judicial protection; Patients with a life expectancy of less than three years; Inability to comply with the monitoring schedule; Contraindication to long-term anticoagulants.