Refeeding syndrome is defined as electrolyte disturbances when attempting to initially feed the undernourished patient. Which electrolytes need to be closely monitored?

Refeeding syndrome is defined as electrolyte disturbances when attempting to initially feed the undernourished patient. Which electrolytes need to be closely monitored?

• A. Potassium, magnesium, and phosphorus
• B. Potassium, magnesium, and calcium
• C. Sodium, potassium, and chloride
• D. Calcium, phosphate, and zinc

Answer: (B)

Refeeding syndrome arises when nutrition is restarted in someone who has been malnourished, and insulin release after the carbohydrate load drives electrolytes into cells, creating dangerous deficiencies. The electrolytes to watch closely are potassium, magnesium, and phosphorus because deficits here are the classic and most clinically significant consequences of this shift. Phosphorus is essential for ATP production and cellular energy; when insulin pushes phosphate into cells, serum phosphate can plummet, leading to weakness, respiratory failure, and other organ dysfunction. Potassium is crucial for cardiac conduction and muscle function; low levels increase the risk of arrhythmias and weakness. Magnesium acts as a key cofactor for many enzymes and helps stabilize cell membranes; hypomagnesemia can worsen or perpetuate hypokalemia and contribute to arrhythmias. Sodium and chloride disturbances relate more to fluid shifts, not the core metabolic derangements of refeeding. Calcium disturbances can occur but are not the primary concern in this context, and zinc is not the electrolyte focus of refeeding syndrome. Therefore, monitoring potassium, magnesium, and phosphorus best addresses the main risks during initial feeding of an undernourished patient.

Refeeding syndrome arises when nutrition is restarted in someone who has been malnourished, and insulin release after the carbohydrate load drives electrolytes into cells, creating dangerous deficiencies. The electrolytes to watch closely are potassium, magnesium, and phosphorus because deficits here are the classic and most clinically significant consequences of this shift. Phosphorus is essential for ATP production and cellular energy; when insulin pushes phosphate into cells, serum phosphate can plummet, leading to weakness, respiratory failure, and other organ dysfunction. Potassium is crucial for cardiac conduction and muscle function; low levels increase the risk of arrhythmias and weakness. Magnesium acts as a key cofactor for many enzymes and helps stabilize cell membranes; hypomagnesemia can worsen or perpetuate hypokalemia and contribute to arrhythmias.

Sodium and chloride disturbances relate more to fluid shifts, not the core metabolic derangements of refeeding. Calcium disturbances can occur but are not the primary concern in this context, and zinc is not the electrolyte focus of refeeding syndrome. Therefore, monitoring potassium, magnesium, and phosphorus best addresses the main risks during initial feeding of an undernourished patient.