Modified Transseptal Puncture Technique in Challenging Septa: A Randomized Comparison to Conventional Technique

Area of Science:

• Cardiovascular Interventions
• Electrophysiology
• Medical Device Technology

Background:

• Transseptal puncture (TSP) is a critical but often challenging procedure during atrial fibrillation (AF) ablation.
• Failure to cross the interatrial septum (FTC) necessitates alternative strategies, potentially increasing procedure time and radiation exposure.

Purpose of the Study:

• To compare the safety and efficacy of a modified TSP technique, the "mosquito" technique (MOSQ-TSP), against conventional TSP (CONV-TSP).
• To evaluate MOSQ-TSP in patients experiencing FTC during AF ablation.

Main Methods:

• A randomized trial involving 68 patients with FTC during AF ablation.
• Patients were randomized to either MOSQ-TSP (puncture via a wafer-thin inner stylet) or CONV-TSP (additional punctures at different sites).
• Primary endpoint was successful left atrial (LA) access; secondary endpoints included safety, time, fluoroscopic dose (DAP), and number of additional punctures.

Main Results:

• MOSQ-TSP achieved 100% LA access success compared to 73.5% with CONV-TSP (p < 0.002).
• Median time to LA access was significantly shorter with MOSQ-TSP (72s vs. 326s, p < 0.002).
• Mean DAP was substantially lower with MOSQ-TSP (1778 mGy/cm² vs. 9347 mGy/cm², p < 0.002), with fewer additional punctures needed.

Conclusions:

• The "mosquito" technique provides effective, safe, and time-sparing LA access in AF patients with initial TSP failure.
• This technique may be particularly beneficial for challenging septal anatomies, including elastic, aneurysmal, or fibrosed septa.