for people ages 18 years and up (full criteria)
at San Francisco, California
study started
estimated completion
Principal Investigator
by Greg Marcus



This is a randomized controlled trial examining whether Baylis's Versacross RF wire versus the conventional Baylis RF needle is better at puncturing through a thin wall in the heart (called "transseptal puncture") as measured by time to successful transseptal puncture, during cardiac ablation procedures.


The transseptal puncture is one of the most commonly performed procedures in the cardiac electrophysiology and interventional cardiology laboratories. Indeed, every atrial fibrillation ablation, now the predominant electrophysiology procedure performed throughout the world, routinely involves two different transseptal puncture procedures. The investigators previously performed a randomized, comparative effectiveness trial demonstrating the superiority (in both efficacy and safety) of a radiofrequency (RF) transseptal needle versus the conventional sharp-tipped mechanical needle. More recently, an alternative approach to transseptal puncture has been FDA approved and is already utilized as part of standard of care in these procedures. With this new approach, a J-shaped wire that can transmit RF energy is advanced inside the transeptal sheath rather than the more stiff RF or conventional needle. As advancing a wire is usually a step employed in any transseptal procedure (then usually requiring removal of that wire and then placement of the needle), this new approach saves a step. In addition once the wire has been advanced across the intra-atrial septum into the left atrium, the wire can be used to avoid potentially severe complications; specifically, after a transseptal needle is advanced across the left atrium, advancing the sheath over the needle can result in a sudden jump of all the equipment, risking perforation of the far left atrial wall. With the wire approach, the wire can be safely advanced into a pulmonary vein so that even if the sheath and dilator jump suddenly across the septum, they will be guided along the wire and thereby avoid perforation. The investigators will be studying patients undergoing a catheter ablation procedure at University of California, San Francisco.


Atrial Fibrillation, Atrial Flutter, Baylis Versacross RF wire, Baylis RF needle


You can join if…

Open to people ages 18 years and up

  • Age ≥ 18 years old
  • Patients undergoing endocardial left atrial catheter ablation procedures using radiofrequency ablation catheters for atrial fibrillation or atrial flutter ablation procedures at UCSF
  • Willing and able to provide written informed consent in English
  • Willing and able to comply with scheduled remote follow-up visits through 1 Year post-operative

You CAN'T join if...

  • Presence of a patent foramen ovale closure device or atrial septal defect closure device
  • Cryoballoon ablation
  • IVC filter
  • Deemed not suitable by study personnel


  • University of California, San Francisco
    San Francisco California 94143 United States

Lead Scientist at UCSF


in progress, not accepting new patients
Start Date
Completion Date
University of California, San Francisco
Study Type
About 75 people participating
Last Updated