Breakthrough in VT Ablation: Overcoming Double Mechanical Valves at Tianjin Chest Hospital

As part of our commitment to showcasing top-tier medical expertise from our accredited network, we present a groundbreaking electrophysiology (EP) case from Tianjin Chest Hospital.

🔹 Baseline Characteristics The patient had a history of valvular heart disease, prior aortic and mitral mechanical valve replacement, and an implanted ICD.

Recently, the patient was admitted for recurrent refractory Ventricular Tachycardia (VT) causing frequent ICD shocks, which were unresponsive to medical therapy. Urgent minimally invasive radiofrequency (RF) ablation was required to control the VT burden.

🔹 The Anatomical Dilemma (The "Locked Room") Due to the physical barrier of bilateral mechanical valves, traditional retrograde (transaortic) and antegrade (transseptal-mitral) ablation pathways were completely unfeasible.

The left ventricle (LV) essentially became a "locked room." Conventional devices could not safely access the LV. Any improper manipulation carried an extreme risk of irreversible mechanical valve entrapment, structural damage, or even fatal complications.

🔹 Procedural Intervention & Technical Details To overcome this severe anatomical barrier, the EP team at Tianjin Chest Hospital (led by Dr. Wei Ma) implemented a highly challenging "Bailout" strategy:

• ICE-Guided Precision Targeting: Intracardiac Echocardiography (ICE) was utilized to construct a detailed 3D anatomical model of the right atrium (RA) and left ventricle (LV). The team precisely identified the inferior pyramidal space (the epicardial fat pad space between the RA and LV), providing real-time imaging navigation to ensure the critical conduction system was avoided.
• Direct RA-LV Puncture: Under dual fluoroscopic and ICE guidance, the team found a breakthrough point at the anteroinferior margin of the coronary sinus ostium using a transseptal needle. By switching to a fixed-curve sheath with stronger mechanical pushability, they successfully overcame the resistance of the hypertrophied ventricular septal myocardium, establishing an iatrogenic pathway directly from the RA to the LV.

🔹 Clinical Summary Following access establishment, high-density substrate mapping was completed, and the VT focus at the LV free wall was successfully ablated, terminating the VT. The procedure was completed without complications such as cardiac tamponade, conduction block, or valvular impairment. Post-operative echocardiography confirmed the near-complete closure of the residual shunt.

This case demonstrates that for complex VT with extreme anatomical challenges like double mechanical valves, an RA-LV puncture approach, supported by strict ICE navigation and profound anatomical expertise, provides a safe and effective percutaneous treatment alternative for patients with obstructed conventional pathways.