A patient presents with muscle weakness, and the ECG shows flattened T waves and prominent U waves. Which electrolyte imbalance is most probable?
Hypokalemia
The combination of muscle weakness with ECG showing flattened T waves and prominent U waves (and sometimes ST depression and QT-U prolongation) is the classic picture of hypokalaemia.
Hyperkalaemia produces tall, tented T waves and QRS widening; hyponatraemia primarily causes neurological symptoms with no specific ECG signature; and hypercalcaemia shortens the QT interval.
Hence, Hypokalemia.
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