Left Atrial Roof Line

The left atrial line enters from the left superior pulmonary vein and exits the far side of the chest.

Left atrial roof line.

Techniques evaluation and consequences of linear block at the left atrial roof in paroxysmal atrial fibrillation. Surface electrocardiographic criteria to differentiate it from mitral annular ma flutters are lacking. Hocini m jais p sanders p takahashi y rotter m rostock t hsu lf sacher f reuter s clementy j haissaguerre m. Addition of linear ablation lesions principally in the atrial roof between the left and right superior pulmonary veins and mitral isthmus between the left inferior pulmonary vein and the mitral annulus led to improved success rates especially in patients with paroxysmal af and coexistent la enlargement and in patients with persistent af.

Isolation of the pulmonary veins pvs for the treatment of atrial fibrillation af is often supplemented with linear lesions within the left atrium la. It is sometimes called sequential ablation because the additional ablation lines are performed in a specified order. If there continues to be afib activity the doctor will ablate the next area in the sequence. A prospective randomized study.

Of the several proposed linear lesions only mitral isthmus and roof line ablation remain commonly performed as an adjunct to pulmonary vein isolation in the treatment of atrial fibrillation 2 3. They described the phenomenon of intra atrial conduction block in a subset of patients undergoing ablation for left lateral accessory pathways. Technique for ablation of the left atrial roof the la roofline is a line of lesions joining the left and right superior pvs. These lines include the la roof the posterior line and the mitral isthmus 6 12 still the role of additional lines remains controversial.

Left atrial la roof dependent flutter is a common macroreentrant la tachycardia that involves the la roof and typically spins around ipsilateral pulmonary veins pvs. Another at with a tachycardia cycle length tcl of 240 ms was then induced. The left atrial line is a single lumen catheter unlike the right atrial line which is double lumen. An irrigated ablation catheter is introduced with its tip oriented toward the la roof.

However there are conflicting data on the effects of creating a roof line rl joining the superior pvs in paroxysmal atrial fibrillation paf. That is doctors may make a lesion line along the roof of the left atrium and then pace or use a mapping catheter to determine whether conduction has been stopped. As a result of greater extension of atrial fibrosis 5 for this reason the creation of additional linear lesions in the left atrium la has been proposed.