Mini-compendium on goal-directed perfusion (GDP) based on a narrative review

Goal-Directed Perfusion represents an evolving physiological framework for the management of cardiopulmonary bypass, designed to preserve tissue oxygenation and protect organ function through the integration of hemodynamic and metabolic control. This mini-compendium expands the concept by including all variables that directly or indirectly affect oxygen delivery, offering a holistic and quantitative view of perfusion adequacy. Traditional approaches based only on flow or arterial pressure fail to consider the complex interdependence between oxygen transport, utilization, and pressure-dependent microcirculation. Goal-Directed Perfusion integrates these dimensions into a single, physiology-based model that combines indexed oxygen delivery, oxygen consumption, carbon dioxide production, oxygen extraction ratio, and mean arterial pressure, together with composite indicators such as the oxygen delivery to carbon dioxide production ratio and the oxygen delivery to oxygen extraction ratio, as well as time–dose response analysis for oxygen delivery and arterial pressure. A narrative review was conducted to synthesize physiological principles, mathematical formulations, and clinical implications of these interrelated variables. Electronic searches in PubMed, Scopus, and Web of Science (2011–2025) identified studies analyzing oxygen and pressure-derived metrics during cardiopulmonary bypass. Twenty-six studies met inclusion criteria. Evidence confirms that indexed oxygen delivery remains the primary determinant of aerobic metabolism, while metabolic coupling ratios refine early detection of oxygen debt and the transition to anaerobic metabolism. The integration of time–dose models for oxygen delivery and arterial pressure quantifies cumulative deficits in perfusion, linking hemodynamic and metabolic domains into a unified assessment. Together, these variables define a multidimensional, predictive system for individualized perfusion management that aligns oxygen transport, metabolic demand, and perfusion pressure in real time. This mini-compendium redefines Goal-Directed Perfusion as an inclusive and integrative approach that unites hemodynamic, metabolic, and temporal determinants of oxygen delivery into a single conceptual continuum. By encompassing all variables influencing oxygen transport, directly or indirectly, this model evolves from a collection of isolated indicators to a holistic, data-driven strategy for optimizing perfusion, minimizing oxygen debt, and preventing postoperative organ dysfunction. Such integration transforms perfusion from a static, flow-based practice into a dynamic and predictive physiology, establishing the foundation for a standardized, patient-specific model of care in contemporary extracorporeal management.