Outcomes of Percutaneous Trans–Right Atrial Access to the Le
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In patients with mechanical valves in the aortic and mitral positions, percutaneous access to the left ventricle (LV) via a transfemoral approach for catheter ablation of ventricular tachycardia (VT) has been considered infeasible.

This study aimed to describe the outcomes of a novel percutaneous trans–right atrial (RA) access to the LV via a femoral venous approach for catheter ablation of VT in patients with mechanical aortic and mitral valves.

This observational study included consecutive patients with mechanical valves in the aortic and mitral positions and recurrent monomorphic drug-refractory VT associated with an LV substrate. Percutaneous LV access was performed from a transfemoral venous route with the aid of a deflectable sheath and a radiofrequency wire by creating an iatrogenic Gerbode defect with direct puncture of the inferior and medial aspect of the RA, adjacent to the inferior-septal process of the LV (ISP-LV), under intracardiac echography guidance. Once the wire crossed to the LV, balloon dilatation of the ventriculotomy site (with a noncompliant balloon; diameter, 8 to 10 mm) was performed to facilitate passage of the sheath within the LV.

Results:
-- A total of 4 patients (mean age, 60 years; mean LV ejection fraction, 31%) with recurrent VT associated with an LV substrate (ischemic cardiomyopathy, 3 patients; nonischemic cardiomyopathy, 1 patient) and mechanical valves in the aortic and mitral position underwent trans-RA access through the ISP-LV for catheter ablation of VT.

-- The time to obtain LV access ranged from 60 minutes (first case) to 22 minutes (last case) (mean, 36 minutes).

-- No complications associated with the access occurred. In particular, in the 3 patients with preserved atrioventricular conduction at baseline, no new conduction abnormalities were observed after the access.

-- Complete VT noninducibility at programmed ventricular stimulation was achieved in 3 cases, and no patient had VT recurrence at a median follow-up of 14 months (range, 6-21 months).

Conclusively, A percutaneous trans-RA access to the LV via a femoral venous approach for catheter ablation of VT in patients with mechanical aortic and mitral valves is feasible and appears safe. This novel technique may allow for catheter ablation of VT in a population of patients in whom conventional LV access via retrograde aortic or atrial transseptal routes is not possible.

Source: https://jamanetwork.com/journals/jamacardiology/article-abstract/2770997
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