Human kidney histopathology in acute obstructive jaundice: a prospective study

Area of Science:

• Nephrology
• Gastroenterology
• Pathology

Background:

• Obstructive jaundice (OJ) is linked to cholestasis and bacterial translocation, causing portal endotoxemia.
• While hemodynamic and histopathological effects of OJ are documented, renal changes in humans remain understudied.
• This study investigates specific kidney histopathology in patients with short-term OJ under standard perioperative care.

Purpose of the Study:

• To identify and characterize specific histopathological changes in the kidneys of patients experiencing short-term obstructive jaundice.
• To evaluate the impact of a standard perioperative medical treatment protocol on renal pathology in this patient group.

Main Methods:

• Prospective study including 20 consecutive patients with biliary obstruction.
• Perioperative management focused on fluid replacement, biliary sepsis prevention, and portal endotoxemia control.
• Kidney biopsies analyzed for tubular changes, thrombotic microangiopathy, endothelial damage, peritubular capillary (PTC) dilatation, and immunofluorescence staining (C4d, IgG, IgA, IgM, C3, C1q).

Main Results:

• All patients exhibited peritubular venule dilatation and acute tubular necrosis, irrespective of preserved renal function and hemodynamic stability.
• Thrombotic microangiopathy, C4d staining in PTCs/arterioles, and immune complex deposits were absent in most patients.
• Three patients showed isolated glomerular C4d deposition without other signs of microvascular or immune injury.

Conclusions:

• Short-term obstructive jaundice induces acute tubular necrosis and PTC dilatation in all patients, even with optimal perioperative management.
• The observed renal changes may stem from mechanisms like endotoxemia, leading to PTC dilatation and hypoperfusion.
• The perioperative treatment protocol demonstrated efficacy in preserving overall renal function and preventing severe renal injury in short-term OJ.