Situation: A 52-year-old man with alcohol use disorder is admitted for poor oral intake. He has eaten very little for the past 12 days. He is 1.70 m tall, weighs 48 kg today, and his usual weight is 60 kg. The team plans nasogastric (NG) tube feeding. He has no documented heart, kidney, or liver failure. For the first 24 hours, the physician orders 10 kcal/kg/day based on his current weight, using a formula that provides 1.5 kcal/mL, given continuously over 24 hours by pump. At what rate should the nurse set the pump? Round off to the nearest whole number.

Calories: 48 kg × 10 kcal/kg = 480 kcal. Volume: 480 kcal ÷ 1.5 kcal/mL = 320 mL. Rate: 320 mL ÷ 24 h = 13.3 mL/h, rounded to 13 mL/h. The low starting rate follows refeeding precautions for a high-risk client.

Why the answer is 13 mL/h

The calculation follows a three-step sequence: determine total daily calories, convert calories to formula volume, then divide by the infusion hours.

Step	Calculation	Result
Daily calorie target	48 kg × 10 kcal/kg/day	480 kcal/day
Formula volume needed	480 kcal ÷ 1.5 kcal/mL	320 mL/day
Continuous pump rate	320 mL ÷ 24 h	13.3 mL/h → 13 mL/h

The starting rate is deliberately low because this client is at high risk for refeeding syndrome. He has lost 12 kg from his usual 60 kg, representing a 20% weight loss, and has had minimal oral intake for 12 days. Chronic alcohol use further depletes thiamine, magnesium, and phosphate stores, compounding the risk.

Key point! Refeeding syndrome is triggered not by the total calories alone but by the sudden shift from catabolism to anabolism. When carbohydrates are reintroduced, insulin secretion rises, driving glucose, phosphate, potassium, and magnesium into cells. The extracellular concentrations of these electrolytes can drop sharply, causing arrhythmias, respiratory failure, seizures, or death. Starting at 10 kcal/kg/day and advancing slowly is a protective strategy.

Watch out! The weight used for the calculation is the current weight (48 kg), not the usual weight (60 kg). Using usual weight would produce 600 kcal/day and a rate of about 17 mL/h, which is the first distractor. Current weight reflects the actual metabolic mass being fed and prevents overfeeding during the initial refeeding window.

The energy requirement literature emphasizes that predictive estimates must be individualized to the patient's clinical phase ^[1]. In critical illness and refeeding contexts, both underfeeding and overfeeding carry harm, and the dose must match the metabolic phase ^[2]. For this client, the acute refeeding phase calls for a conservative starting dose rather than full estimated energy expenditure. Enteral nutrition protocols increasingly stratify patients by nutritional risk and adjust the starting rate accordingly . Although the cited refeeding study focuses on anorexia nervosa, it reinforces the principle that the route and rate of early nutritional support directly influence electrolyte stability during refeeding ^[4]. The same physiologic principle applies to this client with alcohol use disorder and prolonged poor intake.

The nurse should verify the pump setting as 13 mL/h, confirm the formula concentration (1.5 kcal/mL), and anticipate orders for baseline and serial monitoring of serum phosphate, potassium, magnesium, and thiamine supplementation before and during the early feeding period.