Hypomagnesaemia (low serum magnesium) can cause a long QT interval. It is also associated with ectopic beats, atrial tachyarrhythmias and torsades de pointes but these may be caused by co-existing hypokalemia.See also: Electrolytes
Can you add to the information on this page?
- Dr Smith's ECG Blog (Blogs)
- The ECG Made Easy 7th edition (Books)