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Concept
Hypermagnesemia
Résumé
Hypermagnesemia is an electrolyte disorder in which there is a high level of magnesium in the blood. Symptoms include weakness, confusion, decreased breathing rate, and decreased reflexes. Complications may include low blood pressure and cardiac arrest.
It is typically caused by kidney failure or is treatment-induced such as from antacids that contain magnesium. Less common causes include tumor lysis syndrome, seizures, and prolonged ischemia. Diagnosis is based on a blood level of magnesium greater than 1.1 mmol/L (2.6 mg/dL). It is severe if levels are greater than 2.9 mmol/L (7 mg/dL). Specific electrocardiogram (ECG) changes may be present.
Treatment involves stopping the magnesium a person is getting. Treatment when levels are very high include calcium chloride, intravenous normal saline with furosemide, and hemodialysis. Hypermagnesemia is uncommon. Rates among hospitalized patients in renal failure may be as high as 10%.
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 hypermagnesemia 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 – Third-degree atrioventricular block (AV block) 13.0 mEq/L – Cardiac arrest At magnesium levels about 4.5 mEq/L the stretch reflex is lost and with over 6.5 mEq/L respiratory failure may be observed. On ECG hypermagnesemia is mainly manifested by prolongation of PR and QRS intervals, T wave changes and AV block. 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:
Source officielle
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