Case Study 2 — The Phosphate at Six in the Morning: A Refeeding Near-Miss

A composite clinical case. ⚠️ The refeeding mechanism, the at-risk criteria, the monitoring schedule and the management principles are real; the person is constructed. ⚠️ This describes a hospital protocol, not something to attempt independently.**

Setup

Sunday, 21:40. A 58-year-old man is admitted to the medical assessment unit.

Gerard Mbeki. Found by a neighbour, confused and unable to stand. ⚠️ He lives alone. His wife died fourteen months ago.

⚠️ He is confused, dehydrated, cachectic and cold.

The decision that nearly went wrong

The admitting doctor is competent, busy, and has seen a lot of malnourished patients.

Her instinct, written in the notes at 22:10:

"Severely malnourished. For dietitian review. ⚠️ Commence supplemental feeding — will start ONS 3× daily and encourage diet."

⚠️ Three cartons of a standard oral nutritional supplement is roughly 900 kcal, much of it carbohydrate, on top of whatever he eats.

⚠️ For this man, on this night, that could have killed him.

What the night registrar spotted

He was reviewed at 23:30 for a separate reason — the confusion — and the registrar ran the refeeding screen.

⚠️ Gerard met the HIGH RISK criteria several times over:

⚠️ Any ONE of those puts someone in the high-risk category. He had five.

And the registrar's note at 23:45:

⚠️ "HIGH refeeding risk. Do NOT commence standard feeding. Thiamine IV before any carbohydrate. Replace K/PO₄/Mg. Start 5 kcal/kg/day = ~240 kcal. Bloods 6-hourly. Cardiac monitoring."

Why the instinct was dangerous

⚠️ This is the mechanism, and it is worth walking through slowly because it is genuinely counterintuitive.

Gerard has been starving for months. In that state:

1. ⚠️ He has shifted to catabolism — breaking down fat and muscle for fuel, with insulin low.

2. ⚠️ His INTRACELLULAR stores of phosphate, potassium and magnesium are profoundly depleted. His serum levels are already low — which means the depletion is severe, because the body defends serum levels at the expense of cells until it can no longer manage it.

3. ⚠️ His thiamine stores are gone. Alcohol impairs absorption and utilization, and stores last weeks, not months.

⚠️ Now give him 900 kcal of mostly carbohydrate.

⚠️ The clinical consequences: cardiac arrhythmia, cardiac failure, respiratory failure, rhabdomyolysis, seizures, and death — typically within the first 72 hours.

💡 Aha moment. ⚠️ Everything about Gerard says "feed him." That is what a caring, competent clinician wants to do, and it is what the situation appears to demand.

⚠️ And it is the intervention most likely to kill him this week.

This is the single clearest example in this book of a correct-sounding action being dangerous — and the reason "eat more" needs a RATE attached, exactly as "eat less" needed a dose.

⚠️ The historical note makes it stick: refeeding syndrome was described in liberated prisoners of war and famine survivors. People who had survived years of starvation died within days of being fed by people who were trying to help them.

What actually happened

⚠️ Read the day-1 06:00 row again.

His phosphate fell substantially on 240 calories, with replacement already running.

⚠️ That is what 900 calories would have done to him, without replacement, without monitoring, and without thiamine — at two in the morning, on a busy assessment unit, with nobody watching for it.

Ten days later

⚠️ He was discharged at three weeks with community dietetic follow-up, alcohol services, and a neighbour who now checks on him twice a week.

What the admitting doctor said afterwards

⚠️ This is included because it matters, and because she was not wrong to want to feed him.

"I've seen dozens of malnourished patients. I've never seen one that thin. My whole instinct was that he needed food urgently — and he did, just not the way I was about to give it.

⚠️ "What frightens me is that I'd have written the same thing on any other night, and most of the time nothing would have happened, because most malnourished patients aren't at this end of it. I'd have been lucky, repeatedly, and I wouldn't have known."

⚠️ Which is the honest description of most near-misses, and the reason the screen exists as a protocol rather than a judgement call.

Analysis

1. ⚠️ The dangerous instinct was the caring one. Everything about Gerard said "feed him urgently."

2. ⚠️ He met the high-risk criteria five times over, including the strongest single indicator — low potassium, phosphate AND magnesium before feeding.

3. ⚠️ Thiamine went in before any nutrition. In a confused patient with alcohol misuse, giving carbohydrate first risks precipitating Wernicke's encephalopathy.

4. ⚠️ His phosphate fell on 240 calories, with replacement running. The clearest possible demonstration of what a standard feed would have done.

5. It took ten days to reach full requirements — ⚠️ which feels intolerably slow to anyone watching a starving man, and is the correct rate.

6. ⚠️ The catch was incidental. He was reviewed for confusion, not for nutrition. A protocol that depends on the right person happening to look is not a protocol.

7. And the admitting doctor's reflection is the important one. ⚠️ She would have been lucky repeatedly and never known — which is how a near-miss becomes normal practice until it doesn't.

Discussion Questions

1. ⚠️ The catch was incidental. Design the system so it isn't. What triggers the screen, who runs it, and what does it block?

2. The admitting doctor's instinct was compassionate and dangerous. ⚠️ How do you teach against an instinct without teaching hesitation? This chapter also says hesitation kills in anaphylaxis. Reconcile them.

3. ⚠️ Ten days to full feeding. How would you explain that pace to a distressed family member who can see how thin he is? Write it.

4. ⚠️ "I'd have been lucky, repeatedly, and I wouldn't have known." How should healthcare surface near-misses that nobody notices? What are the barriers?

5. Gerard's refeeding risk was driven substantially by alcohol and bereavement. ⚠️ Where should the intervention have happened? What would it have taken?

6. ⚠️ This chapter contains two opposite lessons — "give adrenaline immediately, don't hesitate" (Ch 28) and "feed slowly, resist the urge." What distinguishes the situations? Write the rule that covers both.

Your Turn

⚠️ This is for anyone working in healthcare, and for anyone caring for someone who has been eating very little.

Step 1 — ⚠️ Memorize the screen. It takes thirty seconds and it is the highest-stakes item in this book.

HIGH RISK if ONE of: BMI <16 · weight loss >15% in 3–6 months · little or no intake >10 days · ⚠️ LOW PRE-FEEDING K, PO₄ OR Mg

OR TWO of: BMI <18.5 · weight loss >10% · little intake >5 days · ⚠️ alcohol misuse, or insulin, chemotherapy, antacids or diuretics

Step 2 — ⚠️ The four rules, in order:

1. ⚠️ THIAMINE BEFORE FEEDING. Not with it. 2. ⚠️ START LOW — around 5–10 kcal/kg/day in the highest risk. 3. ⚠️ CHECK PO₄, K, Mg BEFORE and DAILY AFTER. Replace aggressively. 4. ⚠️ DO NOT wait for normal levels to start. Start low and replace alongside.

Step 3 — Know who to think of:

⚠️ Anorexia nervosa (Ch 34) · alcohol use disorder · prolonged fasting or food insecurity · post-bariatric surgery · advanced cancer · older adults after poor intake · ⚠️ and anyone who has eaten little in hospital for a week — which is Ivor, and which is the connection between these two case studies.

Step 4 — ⚠️ And if you are a relative:

If someone you love has eaten very little for more than a few days and is about to be fed — ask:

⚠️ "Has anyone assessed them for refeeding risk?"

It is a reasonable question, it will not offend anyone competent, and it is the one that would have been asked at 22:10 instead of 23:30.