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ECG changes in electrolyte imbalance

Normal ECG
P wave -activation of the atria.
QRS complex -activation of the ventricles
T wave – repolarization of the ventricles.

HYPOKALEMIA
ST depression
Shallow, flat, or inverted T wave
Prominent U wave

HYPERKALEMIA
Flat P waves
Prolonged PR interval
Widened QRS complexes
Tall peaked T waves

HYPOCALCEMIA
Prolonged ST segment
Prolonged QT interval

HYPERCALCEMIA
Shortened ST segment
Widened T wave

HYPOMAGNESEMIA
Depressed ST segment
Tall T waves

HYPERMAGNESEMIA
Prolonged PR interval
Widened QRS complexes

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