Mediguide-Assisted Transseptal Puncture without Echocardiographic Guidance.
BACKGROUND
First description of a technique for left atrium transseptal puncture (TSP) with minimal radiation exposure by using the nonfluoroscopic MediGuide™ tracking system (MG; St. Jude Medical, St. Paul, MN, USA) without the assistance of intracardiac echocardiography.


METHODS
This study included 31 consecutive patients with atrial fibrillation undergoing an MG-assisted percutaneous catheter ablation procedure. A Brockenbrough transseptal needle (BRK) is connected to a standard pressure transducer through a two-input valve. Then, an MG-enabled guidewire is inserted so that its tip exactly matches the BRK's distal tip. After the acquisition of two short radioscopic cine-loops we are able to trace the needle tip on the MG screen, performing the usual TSP maneuver but without fluoroscopy. Successful left atrium access is confirmed by noticing the change in the pressure curve and by advancing the guidewire into the left pulmonary veins. As a control group, 31 matched patients who underwent atrial fibrillation ablation with fluoroscopically guided, pressure-monitored TSP were included.


RESULTS
Sixty-two MG-assisted TSP attempts were performed; all but two were successfully accomplished without changing to the conventional technique (96.7%). The mean total fluoroscopy time, until the double transseptal access was performed, was 26.65 ± 37.97 seconds in the MG group and 129.13 ± 37.77 seconds in the conventional-TSP group (P < 0.001). No major complications occurred during any of the procedures.


CONCLUSIONS
This new technique for TSP using MG is feasible and can be performed with minimal radiation exposure without the need for additional imaging techniques, achieving a significant reduction of fluoroscopy time.
Cardiology Department, Clínica Universidad de Navarra, Pamplona, Spain.
Gabriel
G
Ballesteros
Cardiology Department, Clínica Universidad de Navarra, Pamplona, Spain.
Pablo
P
Ramos Ardanaz
Cardiology Department, Clínica Universidad de Navarra, Pamplona, Spain.
Renzo
R
Neglia
Cardiology Department, Clínica Universidad de Navarra, Pamplona, Spain.
Marcel
M
Palacio Solís
Cardiology Department, Clínica Universidad de Navarra, Pamplona, Spain.
Cristina
C
Díaz Fernández
Cardiology Department, Clínica Universidad de Navarra, Pamplona, Spain.
Graciela
G
López González
Cardiology Department, Clínica Universidad de Navarra, Pamplona, Spain.
Elene
E
Janiashvili
Cardiology Department, Clínica Universidad de Navarra, Pamplona, Spain.
Ignacio
I
García-Bolao
D001281:Atrial Fibrillation / Q000000981:diagnostic imaging* / Q000601:surgery*; D017115:Catheter Ablation / Q000379:methods*; D004452:Echocardiography; D005260:Female; D006346:Heart Septum / Q000000981:diagnostic imaging* / Q000601:surgery*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011677:Punctures / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D025321:Surgery, Computer-Assisted / Q000379:methods*; D016896:Treatment Outcome; D018084:Ultrasonography, Interventional
MediGuide; atrial fibrillation ablation; fluoroscopy reduction; transseptal puncture