Flujo Retrógrado Controlado por Bomba (PCRTO) versus Destete Convencional en VA-ECMO:

Revisión Sistemática

Abstract

Introduction: The transition from venoarterial extracorporeal life support (VA-ECMO) to native circulation constitutes one of the moments of greatest clinical vulnerability for the patient in cardiogenic shock. Historically, the lack of evidence and consensus has perpetuated reliance on conventional methods, such as stepwise flow reduction or the insertion of arteriovenous bridges, approaches that disrupt the rheological integrity of the circuit or structurally fail to accurately assess right ventricular reserve under real loading conditions.

Objective: To perform a qualitative and quantitative assessment of the feasibility, safety, and physiological compatibility of the pump-controlled retrograde flow trial off (PCRTO) compared with conventional weaning strategies. The fundamental purpose of this analysis is to integrate recent findings from Western databases with the extensive clinical experience documented in Asian biomedical databases, thereby formulating a unified theoretical framework that may be extrapolated to centers across the Latin American region.

Review Design and Selection Criteria: A systematic review was structured in accordance with PRISMA methodological guidelines, evaluating comparative studies, retrospective studies, and case reports. Primary outcomes included overall survival, decannulation, thromboembolic complications, and integration with invasive hemodynamic monitoring. The search strategy was expanded to EMBASE, PubMed, Cochrane, CNKI, and Wanfang in order to capture the global body of evidence.

Results: Multiple cohorts were analyzed, collectively comprising more than 500 patients. The PCRTO approach demonstrated success in decannulation and statistical superiority in survival to hospital discharge (90% vs. 72%). The evidence conclusively confirmed a null incidence of acute thromboembolic complications under retrograde flow dynamics, underscoring the therapeutic value of the technique in reducing systemic D-dimer levels and facilitating autologous blood reinfusion. Likewise, the mechanistic synergy between PCRTO and floating pulmonary artery catheterization demonstrated the capacity to quantify reversal of the shock state and to unmask any degree of hemodynamic instability that traditional methods might have overlooked.

Conclusions: The PCRTO method represents a diagnostically and therapeutically reliable strategy for the weaning process from VA-ECMO support. By minimizing circuit manipulation, maintaining laminar flow (thus protecting against stasis), and providing an in vivo biventricular stress test, PCRTO overcomes the limitations of conventional approaches. This opens the opportunity for rigorous randomized studies that may objectively determine its systematic benefit.