Bone disease associated with total parenteral nutrition

Area of Science:

• Metabolic Bone Disease
• Nutritional Science
• Clinical Medicine

Background:

• Total parenteral nutrition (TPN) is a life-sustaining intervention for patients unable to absorb nutrients orally.
• Long-term TPN use (>3 months) has been associated with various complications, including metabolic disturbances.
• The specific impact of TPN on bone metabolism in adults requires further elucidation.

Observation:

• Eleven adult patients receiving long-term TPN developed severe, disabling bone pain.
• Clinical presentation included insidious onset and significant functional impairment.
• No significant abnormalities were detected in serum calcium, phosphorus, 25-hydroxy-vitamin D, or parathyroid hormone levels.

Findings:

• Bone biopsies revealed patchy osteomalacia characterized by impaired mineralization and reduced bone turnover.
• Hypercalciuria was a consistent finding in all patients on long-term TPN.
• No biochemical markers differentiated symptomatic from asymptomatic patients.

Implications:

• This study identifies an unrecognized metabolic bone disease linked to prolonged TPN.
• Resolution of skeletal symptoms upon TPN discontinuation suggests a direct causal relationship.
• Further research is crucial to understand the pathogenesis of TPN-induced bone disease and develop targeted preventive strategies.