October 13
by Jonathan Downham
Summary:
In this episode, we spotlight a stealthy ICU disruptor — hypophosphataemia. Based on a 2024 narrative review in the Journal of Clinical Medicine, we explore why phosphate matters, how it goes missing in critically ill patients, and why you should care even when it’s just “a little low.”
What’s Covered:
The vital role of phosphate in energy, oxygen delivery, and muscle function
Why hypophosphataemia affects 20–80% of ICU patients
Clinical consequences, from muscle weakness to respiratory failure, arrhythmias, and delirium
Common causes: refeeding, DKA, diuretics, malnutrition, and sepsis
Replacement options — and why there's no universal guideline
When to go IV, when oral might suffice, and what risks to watch for
Key Takeaways:
Don’t overlook mild phosphate drops — they’re not always benign
Severe hypophosphataemia (<0.4 mmol/L) can be life-threatening
Consider protocols for screening and replacement in high-risk ICU patients
More research is needed, but clinical awareness matters now
Final Thought:
Phosphate might be the quiet ninja of the ICU — when it vanishes, chaos isn’t far behind. Check your labs, trust your gut, and give phosphate the respect it deserves.
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