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DI Lecture Mg Part 1

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alchemist04's version from 2016-10-02 22:02

Section

Question Answer
What is the normal Mg range in the extracellular?1.6 - 2.5 mEq/L
What is the range for hypomagnesemia?< 1.6 mEq/L
What is the range for hypermagnesemia?> 2.5 mEq/L
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Question Answer
What are the causes of hypomagnesemia? (1)Proton Pump Inhibitors (PPI, GERD medications, -prazole)
What are the causes of hypomagnesemia? (2)Loop and Thiazide diuretics
What are the causes of hypomagnesemia? (3)Renal loss (via kidney excretion)
What are the causes of hypomagnesemia? (4)GI loss (Diarrhea and Vomiting)
What are the causes of hypomagnesemia? (5)Laxative abuse
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Question Answer
Less than 95% of renally filtered Mg is reabsorbed?False, approximately 95% of renally filtered mg is reabsorbed
How does refeeding affects hypomagnesemia?It causes Insulin release, swith to anabolic state, internal redistribution and trapping of Mg in newly formed tissue
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Question Answer
What are the medications for Rx of hypomagnesemia? (1)Magnesium Oxide
What are the medications for Rx of hypomagnesemia? (2)Magnesium Sulfate
What are the medications for Rx of hypomagnesemia? (3)Magnesium Chloride (Slow Mag)
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Question Answer
What is the regular dose for Mg Oxide?400 - 800 mg BID
What is the regular dose for Mg Chloride?64 mg
T or F, avoid IM route when possible due to pain and venous sclerosisT
T or F, if a pt is takin 240 to 1000 mg elemental Mg per day, it is ok to give in divided doses?T
Oral products, Mg Chloride and Mg Oxide have limited bioavailability?T
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Question Answer
What is the strength of Mg sulfate?1g = 8 mEq
How many % of Mg sulfate is excreted in the urine?50%
What is the maximum infusion rate for Mg sulfate?2 gram over 1 hour
In an emergency, what is the maximum infusion rate?2 gram in 10 mL IV push per 1 minute
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Question Answer
When do you give PO Mg Rx for HypoMag?When the Magnesium level is > 0.8 mEq/L (asymptomatic)
When do you give IV Mg Rx for HypoMag?When the Mg level is < or = 0.8 mEq/L (Symptomatic or Intolerant to PO)
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