Acute elevations of magnesium usually are more symptomatic than slow rises. Nausea Vomiting Skin flushing Weakness Lightheadedness High magnesium levels are associated with depressed levels of consciousness. Electrolytes, including potassium, magnesium, and calcium Magnesium elevation usually is not found as an isolated electrolyte abnormality. Hyperkalemia and hypercalcemia often are present concurrently. BUN and creatinine Order renal function tests and calculate creatinine clearance to assess the ability of the kidney to excrete magnesium.
Hypothyroidism is a rare cause of hypermagnesemia.
Check these tests in the absence of any other good explanation. An ECG and cardiac monitor may show prolongation of the PR interval or intraventricular conduction delay, which are nonspecific findings. Although the effectiveness of dialysis in removing divalent cations is debated, some studies have demonstrated removal of a large amount of magnesium using this modality. Assess the patient's ABCs and stabilize. Intubate if necessary.