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8th April 2024
A 50-year-old housewife presents with a 2-week history of palpitations
A 50-year-old housewife presents with a 2-week history of palpitations. Her blood results are shown below:
| Result | Normal range | |
|---|---|---|
| Na+ | 136 mmol/l | 133-146mmol/l |
| K+ | 4.5 mmol/l | 3.5-5.3mmol/l |
| Urea | 6 mmol/l | 2.5-6.5 mmol/l |
| Creatinine | 52μmol/l | 45-104 μmol/l |
| Calcium | 2.23 mmol/l | 2.2-2.6 mmol/l |
| Magnesium | 0.75 mmol/L | 0.70 – 1.00 mmol/L |
| TSH | 0.07 uU/L | 0.27 – 4.2 uU/L |
| T4 | 45 pmol/L | 12 – 22 pmol/L |
Her ECG shows an irregularly irregular rate of 110 bpm. What is the underlying mechanism of the clinical picture above?
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