- Hypermagnesemia
Infobox_Disease
Name = PAGENAME
Caption =Magnesium
DiseasesDB = 6259
ICD10 = ICD10|E|83|4|e|70
ICD9 = ICD9|275.2
ICDO =
OMIM =
MedlinePlus =
eMedicineSubj = med
eMedicineTopic = 3383
eMedicine_mult = eMedicine2|emerg|262 eMedicine2|ped|1080
MeshID =Hypermagnesemia is an
electrolyte disturbance in which there is an abnormally elevated level ofmagnesium in the blood. Usually this results in excess of magnesium in the body.Hypermagnesemia occurs rarely because the
kidney is very effective in excreting excess magnesium. It usually develops only in people with kidney failure who are given magnesium salts or who take drugs that contain magnesium (e.g. someantacid s andlaxative s). It is usually concurrent withhypercalcemia and/orhyperkalemia .Metabolism
For a detailed description of magnesium
homeostasis andmetabolism seehypomagnesemia .ymptoms
* Weakness, nausea and vomiting
* Impaired breathing
*Hypotension
*Hypocalcemia
*Arrhythmia andAsystole Though Arrhythmia and Asystole are possible cardiac outcomes of Hypermagnesemia, most cardiac symptoms are due to conduction delays, since magnesium acts as physiologic calcium blocker.
Clinical consequences related to serumconcentration:
*4.0 mEq/lhyporeflexia
*>5.0 mEq/l Prolonged atrioventricular conduction
*>10.0 mEq/l Completeheart block
*>13.0 mEq/lCardiac arrest Causes
Since magnesium is excreted through the
kidney s,renal failure (as a result of hypermagnesemia) most often occurs due to prolonged over supplementation or long term use of magnesium containing medications or laxatives.Predisposing conditions
*
Hemolysis , magnesium concentration in erythrocytes is approximately three times greater than in serum, therefore hemolysis can increase plasma magnesium. Hypermagnesemia is expected only in massive hemolysis.
*Renal insufficiency , excretion of magnesium becomes impaired whencreatinine clearance falls below 30 ml/min. However, hypermagnesemia is not a prominent feature of renal insufficiency unless magnesium intake is increased.
*Other conditions that can predispose to mild hypermagnesemia arediabetic ketoacidosis ,adrenal insufficiency ,hyperparathyroidism andlithium intoxication .Therapy
Prevention of hypermagnesemia usually is possible. In mild cases, withdrawing magnesium suppletion is often sufficient. In more severe cases the following treatments are used:
*Intravenous calcium gluconate , because the actions ofmagnesium inneuromuscular andcardiac function are antagonized bycalcium .Definitive treatment of hypermagnesemia requires increasing renal magnesium excretion through:
* Intravenousdiuretic s, in the presence of normalrenal function
*Dialysis , when kidney function is impaired and the patient is symptomatic from hypermagnesemia
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