Alternative Strategies for Left Ventricular Unloading With a Transseptal Approach

Cardiogenic shock (CS) is a life–threatening syndrome characterized by inadequate cardiac output, hypoperfusion and progressive organ dysfunction, with persistently high mortality despite advances in revascularization and critical care. In selected cases, mechanical circulatory support (MCS), including veno–arterial extracorporeal membrane oxygenation (VA–ECMO), is required. However, retrograde aortic flow during VA–ECMO increases left ventricular (LV) afterload, potentially worsening LV distension, pulmonary congestion, and myocardial oxygen demand. Although unloading strategies such as intra–aortic balloon pump (IABP) support or transaortic devices may mitigate these effects, they are often contraindicated in patients with complex anatomy or mechanical complications. Left atrial veno–arterial extracorporeal membrane oxygenation (LAVA–ECMO) enables targeted left atrial decompression via transseptal access, reducing pulmonary venous and LV filling pressures. Biatrial drainage is feasible but less commonly utilized. A 32–year–old man previously treated for a late–presenting ST–segment elevation myocardial infarction, complicated by persistent severe LV dysfunction (ejection fraction 25%), was rehospitalized for worsening heart failure despite optimized medical therapy and IABP support. Multimodality imaging revealed a mid–apical LV aneurysm, an intramural hematoma, and an organized pericardial effusion consistent with suspected focal LV rupture. Surgical repair was contraindicated, and implantation of an Impella device or durable LV assist device was deemed unacceptably high risk. In the setting of progressive clinical deterioration, LAVA–ECMO was initiated as a bridge to heart transplantation. Following echocardiography–guided transseptal puncture and balloon septostomy, a biatrial drainage cannula was positioned (Figure 1-2), and ECMO flow was increased to 4 L/min. This unloading strategy resulted in stabilization of hemodynamic and respiratory parameters (Figure 3) and a marked reduction in intracavitary spontaneous echo contrast (“smoke”). Although moderate LV distension persisted, the greatest hemodynamic benefit was observed during the first 36 hours of support. Despite evidence of rapid hemodynamic improvement and the ability to provide effective biventricular support through single–access biatrial drainage, patient selection for LAVA–ECMO remains challenging. Heterogeneity in indications, timing, ventricular geometry, and pathology limits standardized selection criteria.