Giving vitamin B12 parenterally? 🤔 Which electrolyte should you check first? Answer: ⬇️ Potassium. 🔎 And why does it matter? Because rapid correction of severe B12 deficiency can trigger a surge in bone marrow activity and red blood cell production. As the marrow suddenly starts making new cells aggressively, potassium shifts intracellularly and serum levels can fall fast. That means: ⚠️ Hypokalemia can develop or worsen which can lead to: • Cardiac arrhythmias • Muscle weakness • QT prolongation • In severe cases, sudden cardiovascular instability This is a classic board-style pearl that many clinicians forget because B12 feels “benign.” But in profoundly deficient patients—especially those with severe megaloblastic anemia—repletion is metabolically active treatment. Clinical Pearl: Before parenteral B12, always think: 🧪 Check potassium ❤️ Prevent hypokalemic arrhythmia Medicine is often about anticipating the treatment complication before it happens. 💬 Did you know this one? Any other clinical nutrition pearls you can share or that I should do a post on next?
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