Renal and systemic oxygen consumption in patients with normal and abnormal renal function

Area of Science:

• Nephrology
• Physiology
• Pathophysiology

Background:

• Chronic renal failure (CRF) impacts systemic and renal hemodynamics.
• Anemia is common in CRF patients.
• The role of diabetes mellitus in CRF-related renal oxygen consumption is not fully understood.

Purpose of the Study:

• To investigate systemic and renal oxygen consumption and hemodynamics in patients with normal renal function and moderate CRF.
• To compare CRF patients with and without diabetes mellitus.
• To elucidate the relationship between renal oxygen consumption, blood flow, and creatinine clearance.

Main Methods:

• Studied systemic and renal oxygen consumption and hemodynamics.
• Compared patients with normal renal function (NI), CRF with diabetes mellitus, and CRF without diabetes mellitus.
• Measured serum creatinine, oxygen consumption, oxygen extraction, cardiac output, arterial oxygen saturation, renal blood flow (RBF), and creatinine clearance.

Main Results:

• CRF patients had normal systemic oxygen consumption but elevated systemic oxygen extraction.
• CRF patients showed higher renal oxygen extraction, lower RBF, and lower renal oxygen consumption per kidney compared to NI.
• CRF patients with diabetes had significantly lower RBF and renal oxygen consumption per kidney than those without diabetes, despite equivalent renal oxygen extraction.

Conclusions:

• Moderate CRF is characterized by normal systemic oxygen consumption but reduced RBF and renal oxygen consumption.
• Diabetes mellitus exacerbates the reduction in RBF and renal oxygen consumption in CRF.
• Renal hypermetabolism appears more likely in non-diabetic CRF than in diabetic renal disease.