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Samenvatting Magnesium

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Hoofdstuk magnesium samenvatting van het boek: Marino's the ICU book

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Magnesium

Basics:
gemiddelde mens heeft 24 gram magnesium; waarvan meer dan de helft in bot zit.

<1% zit in plasma.



Serum magnesium: beter dan plasma; in plasma wordt citraat gebruikt dat magnesium bindt.

Geioniseerd magnesium:
67% van het magnesium in plasma is in de geioniseerde vorm(actief). 33% gebonden aan plasma
proteinen. Of gebonden aan andere anionsen zoals fosfaat en sulfaat.

Bij Mg tekort zal er bijna geen Mg in urine zitten.  in urine is effect veel sneller te zien dan in plasma.

Mg deficientie:
in 65% van de patienten op de IC depletie hoeft niet zih te vertonen als hypomagnesiemie; vaak
ondergediagnosticeerd.

uiitlokkende factoren:
Serum Mg zegt weinig over totale Mg poel.
Volgende aandoeningen gaan vaak gepaard met magnesium depletie:




Diuretica:
 leading cause. Remming van natrium gaat ook gepaard met remming van reabsorptie van Mg.
( vooral lisdiuretica) Mg depletie niet bij kalium sparende middelen.



Antibiotica:
aminoglycosides, amfoticerine en pentamidine. Aminoglycosides blokkeren Mg reabsorptie in de
stijgende lis van Henle.

Andere medicatie:
Lang gebruik van PPI’s ( twee weken – 13 jaar)  verminderde opname in GI.
digitalis, epinephrine( beide Mg shift in cellen) en chemotherapeutica( cisplatina en cyclosporine
renale excretie)
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