Carbohydrate metabolism in uraemia

Area of Science:

• Nephrology
• Endocrinology
• Metabolic Diseases

Background:

• Uraemia is frequently associated with insulin resistance, impacting carbohydrate metabolism.
• While hypoglycaemia can occur in a minority, insulin resistance is a more common complication in uraemic patients.
• Understanding these metabolic alterations is crucial for patient management.

Purpose of the Study:

• To review the occurrence, mechanisms, and consequences of insulin resistance in uraemia.
• To discuss the potential causes of hypoglycaemia in a subset of uraemic patients.
• To explore therapeutic strategies for improving insulin sensitivity and reducing cardiovascular risk.

Main Methods:

• Literature review focusing on uraemia and insulin resistance.
• Analysis of studies investigating carbohydrate metabolism defects in uraemia.
• Examination of the role of accumulating nitrogenous compounds and uraemic consequences.

Main Results:

• Insulin resistance is evident below a glomerular filtration rate of 50 ml/min/1.73 m² in non-diabetics and affects diabetic patients.
• Defects include reduced glucose non-oxidative disposal, abnormal glucose oxidation, altered endogenous glucose production, and impaired insulin secretion.
• Accumulating nitrogenous compounds, like carbamoylated amino acids, are key mechanisms, alongside factors like anaemia and metabolic acidosis.

Conclusions:

• Renal replacement therapies and low-protein diets can improve insulin sensitivity in uraemic patients.
• Despite improvements, cardiovascular risk remains elevated.
• Identifying specific molecular culprits of insulin resistance and utilizing insulin sensitizers like glitazones are promising avenues for risk reduction.