Which immunomodulating nutrient may be harmful in patients with severe sepsis?

Which immunomodulating nutrient may be harmful in patients with severe sepsis?

• A. Arginine
• B. Glutamine
• C. Nucleic acids
• D. Omega-3 fatty acids

Answer: (A)

Arginine is risky in severe sepsis because it is a key substrate for nitric oxide production. In septic patients, inducible nitric oxide synthase is already upregulated, driving high levels of nitric oxide that cause vasodilation and can lead to hypotension and poor tissue perfusion. Supplying extra arginine can amplify this nitric oxide pathway, potentially worsening shock and organ dysfunction. Other immunonutrition options don’t share this direct mechanism. Glutamine has mixed evidence but is not known to provoke the same dangerous hemodynamic effects in sepsis. Omega-3 fatty acids may modulate inflammation and are sometimes studied for benefit in critical illness. Nucleic acids (nucleotides) support immune function in some settings and aren’t clearly linked to harm in sepsis. The distinct risk in this context is arginine due to its NO-mediated vascular effects.

Arginine is risky in severe sepsis because it is a key substrate for nitric oxide production. In septic patients, inducible nitric oxide synthase is already upregulated, driving high levels of nitric oxide that cause vasodilation and can lead to hypotension and poor tissue perfusion. Supplying extra arginine can amplify this nitric oxide pathway, potentially worsening shock and organ dysfunction.

Other immunonutrition options don’t share this direct mechanism. Glutamine has mixed evidence but is not known to provoke the same dangerous hemodynamic effects in sepsis. Omega-3 fatty acids may modulate inflammation and are sometimes studied for benefit in critical illness. Nucleic acids (nucleotides) support immune function in some settings and aren’t clearly linked to harm in sepsis. The distinct risk in this context is arginine due to its NO-mediated vascular effects.