Home | | Anesthesiology | Normal Magnesium Balance

Chapter: Clinical Anesthesiology: Perioperative & Critical Care Medicine: Management of Patients with Fluid & Electrolyte Disturbances

Normal Magnesium Balance

Magnesium intake averages 20–30 mEq/d (240– 370 mg/d) in adults. Of that amount, only 30–40% is absorbed, mainly in the distal small bowel.

NORMAL MAGNESIUM BALANCE

 

Magnesium intake averages 20–30 mEq/d (240– 370 mg/d) in adults. Of that amount, only 30–40% is absorbed, mainly in the distal small bowel. Renal excretion is the primary route for elimination, averaging 6–12 mEq/d. Magnesium reabsorption by the kidneys is very efficient. Twenty-five per-cent of filtered magnesium is reabsorbed in the proximal tubule, whereas 50–60% is reabsorbed in the thick ascending limb of the loop of Henle. Fac-tors known to increase magnesium reabsorption in the kidneys include hypomagnesemia, PTH, hypo-calcemia, ECF depletion, and metabolic alkalosis. Factors known to increase renal excretion include hypermagnesemia, acute volume expansion, hyper-aldosteronism, hypercalcemia, ketoacidosis, diuret-ics, phosphate depletion, and alcohol ingestion.

Plasma Magnesium Concentration

 

Plasma [Mg2+] is closely regulated between 1.7 and 2.1 mEq/L (0.7–1 mmol/L or 1.7–2.4 mg/dL) through interaction of the gastrointestinal tract (absorption), bone (storage), and the kidneys (excre-tion). Approximately 50–60% of plasma magnesium is unbound and diffusible.

Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail
Clinical Anesthesiology: Perioperative & Critical Care Medicine: Management of Patients with Fluid & Electrolyte Disturbances : Normal Magnesium Balance |


Privacy Policy, Terms and Conditions, DMCA Policy and Compliant

Copyright © 2018-2024 BrainKart.com; All Rights Reserved. Developed by Therithal info, Chennai.