Which trace element should be monitored weekly during TPN therapy?

Which trace element should be monitored weekly during TPN therapy?

• A. Copper
• B. Selenium
• C. Molybdenum
• D. Chromium

Answer: (B)

In total parenteral nutrition, trace elements must be supplied and watched closely because there’s no enteral intake to supply them and illness can alter needs. Selenium is particularly critical to monitor weekly because its stores can be depleted quickly in PN, and deficiency has serious consequences. Selenium is a component of important antioxidant enzymes (like glutathione peroxidase) and plays a role in immune function and thyroid hormone metabolism. When selenium is low, oxidative damage increases, immune defense weakens, and muscle or heart issues can arise, including cardiomyopathy in severe cases. Detecting and correcting deficiency early with weekly checks helps prevent these complications as the PN regimen is adjusted. The other elements listed are still important in PN, but they don’t carry the same immediate risk of rapid deficiency that demands weekly surveillance in typical practice.

In total parenteral nutrition, trace elements must be supplied and watched closely because there’s no enteral intake to supply them and illness can alter needs. Selenium is particularly critical to monitor weekly because its stores can be depleted quickly in PN, and deficiency has serious consequences. Selenium is a component of important antioxidant enzymes (like glutathione peroxidase) and plays a role in immune function and thyroid hormone metabolism. When selenium is low, oxidative damage increases, immune defense weakens, and muscle or heart issues can arise, including cardiomyopathy in severe cases. Detecting and correcting deficiency early with weekly checks helps prevent these complications as the PN regimen is adjusted.

The other elements listed are still important in PN, but they don’t carry the same immediate risk of rapid deficiency that demands weekly surveillance in typical practice.