Symptoms include weakness, confusion, decreased breathing rate, and decreased reflexes. As well as nausea, low blood pressure, low blood calcium, abnormal heart rhythms and asystole, dizziness, and sleepiness. Abnormal heart rhythms and asystole are possible complications of<unk>  related to the heart. Magnesium acts as a physiologic calcium blocker, which results in abnormalities of the electrical conduction system of the heart. Consequences related to serum concentration: * 4.0 mEq/L – Decreased reflexes * >5.0 mEq/L – Prolonged atrioventricular conduction * >10.0 mEq/L – Complete heart block * >13.0 mEq/L – Cardiac arrest The therapeutic range for the prevention of the pre-eclamptic uterine contractions is: 4.0–7.0 mEq/L. As per Lu and Nightingale, serum magnesium concentrations associated with maternal toxicity (also neonate depression, hypotonia and low Apgar scores) are: * 7.0–10.0 mEq/L – Loss of patellar reflex * 10.0-13.0 mEq/L – Respiratory depression * 15.0-25.0 mEq/L – Altered atrioventricular conduction and (further) complete heart block * >25.0 mEq/L – Cardiac arrest Complications Severe<unk>  (levels greater than 12 mg/dL) can lead to cardiovascular complications (hypotension and arrhythmias) and neurological disorder (confusion and lethargy). Higher values of serum magnesium (exceeding 15 mg/dL) can induce cardiac arrest and coma.
Hypermagnesemia
Rhabdomyolysis
Hyponatremia
Hypercalcaemia
Lithium toxicity
Hypophosphatemia
Hyperkalemia
Hypernatremia