What does CTI stand for?

What does CTI stand for?

• A. Cavotricuspid Isthmus
• B. Coronary Sinus Ostium
• C. Cavoatrial Junction
• D. Cardiac Tricuspid Interface

Answer: (A)

CTI stands for Cavotricuspid Isthmus, the region of the right atrium between the inferior vena cava opening and the tricuspid valve annulus. This area forms the critical slow-conduction path that sustains the typical atrial flutter circuit; catheter ablation across the CTI creates a bidirectional block that interrupts the flutter and often cures the arrhythmia. The other terms refer to different anatomical structures (for example, the coronary sinus ostium is the opening of the coronary sinus into the right atrium, and the cavoatrial junction is where the caval veins meet the atrium) and do not describe the CTI.

CTI stands for Cavotricuspid Isthmus, the region of the right atrium between the inferior vena cava opening and the tricuspid valve annulus. This area forms the critical slow-conduction path that sustains the typical atrial flutter circuit; catheter ablation across the CTI creates a bidirectional block that interrupts the flutter and often cures the arrhythmia. The other terms refer to different anatomical structures (for example, the coronary sinus ostium is the opening of the coronary sinus into the right atrium, and the cavoatrial junction is where the caval veins meet the atrium) and do not describe the CTI.