A patient has been diagnosed with digitalis-induced dysrhythmia. The patient is administered magnesium sulfate IV to resolve a low potassium level. What effect does hypomagnesemia have?
A) Decreased QRS complex
B) Increased stroke volume
C) Myocardial irritability
D) Elevated ST segment
C
Feedback:
Hypomagnesemia increases myocardial irritability. Magnesium deficit prolongs the QRS complex instead of decreasing the QRS complex. Hypomagnesemia does not increase stroke volume. Hypomagnesemia will depress the ST segment, not elevate the ST segment.
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