In liver transplantation, the phase with the greatest hemodynamic instability is the?

In liver transplantation, the phase with the greatest hemodynamic instability is the?

• A. Induction
• B. Dissection phase
• C. Anhepatic phase
• D. Reperfusion phase

Answer: (D)

Reperfusion introduces abrupt metabolic and electrolyte disturbances that create the greatest hemodynamic instability. When the graft is revascularized, a sudden washout of the cold preservation solution dumps potassium and other metabolites into the circulation, causing hyperkalemia and myocardial depression, along with acid-base disturbances. This ionic surge can provoke arrhythmias and a drop in cardiac contractility. At the same time, reperfusion releases inflammatory mediators and triggers systemic vasodilation, leading to a dramatic fall in systemic vascular resistance and profound hypotension. The combination of these effects makes the reperfusion phase the most unstable period of the operation, requiring immediate readiness for vasopressor support, calcium administration, and careful hemodynamic management. Induction and dissection can cause instability from anesthesia effects and blood loss, and the anhepatic phase challenges venous return with cross-clamping, but the reperfusion event produces the largest and most abrupt hemodynamic swings.

Reperfusion introduces abrupt metabolic and electrolyte disturbances that create the greatest hemodynamic instability. When the graft is revascularized, a sudden washout of the cold preservation solution dumps potassium and other metabolites into the circulation, causing hyperkalemia and myocardial depression, along with acid-base disturbances. This ionic surge can provoke arrhythmias and a drop in cardiac contractility. At the same time, reperfusion releases inflammatory mediators and triggers systemic vasodilation, leading to a dramatic fall in systemic vascular resistance and profound hypotension. The combination of these effects makes the reperfusion phase the most unstable period of the operation, requiring immediate readiness for vasopressor support, calcium administration, and careful hemodynamic management. Induction and dissection can cause instability from anesthesia effects and blood loss, and the anhepatic phase challenges venous return with cross-clamping, but the reperfusion event produces the largest and most abrupt hemodynamic swings.