• Disturbances in serum magnesium concentration are often associated with with disturbances in calcium and potassium levels thereby increasing the risks of asystole, fatal tachyarrhythmias, and PEA (pulseless electrical activity).
• ECG changes in magnesium disturbances are similar to those in potassum disturbances.
• In hypomagnesemia, QTc intervals are prolonged.
• Accordingly, there is an increased risk of Torsades de pointes and fatal tachyarrhythmia.
• ECG findings associated with hypermagnesemia include:
Sinus bradycardia
AV block
Intraventricular conduction delay (widened QRS without BBB pattern)
