Hypomagnesemia is having a serum magnesium concentration of <1.3 mEq/L.
Patients with mild hypomagnesemia is asymptomatic and have usually a serum Mg >0.5 mmol/L. While those with moderate-severe hypomagnesemia, the patient is symptomatic and have serum Mg <5 mmol/L.
Hypermagnesemia signs and symptoms usually do not appear unless Mg >2 mmol/L (5 mg/dL). It rarely occurs and usually iatrogenic.
Treatment with intravenous (IV) dexamethasone for 10 days significantly reduces duration of mechanical ventilation at 28 days and 60-day mortality in patients with established moderate-to-severe acute respiratory disease syndrome (ARDS) compared with no dexamethasone, results of the DEXA-ARDS trial have shown.