42 results
Approach to Hypomagnesemia 

Fractional excretion of magnesium = (urine magnesium x serum creatinine)/ [0.7 (serum magnesium
Approach to Hypomagnesemia ... intake, Gl loss, shift ... differential #diagnosis #causes ... #nephrology #magnesium ... #low
Hypomagnesemia - Differential Diagnosis
Renal Causes of Hypomagnesemia - Familial:
Bartter syndrome and Gitelman syndrome, Isolated recessive hypomagnesemia,
Diagnosis Renal Causes ... Renal Causes of ... differential #diagnosis #causes ... #nephrology #magnesium ... #low
Hypokalemia - Differential Diagnosis Algorithm

Transcellular Shift:
 • Alkalosis
 • ↑ beta-2 adrenergic simulation 
 • Erythropoiesis
Transcellular Shift ... vomiting) • Low ... Transcellular shifts ... Diagnosis #Algorithm #nephrology ... #low #potassium
Causes of Hyperkalemia - Differential Diagnosis Algorithm
 • Increased Intake
 • Reduced Excretion (IV potassium with
Causes of Hyperkalemia ... Excretion (IV potassium ... Transcellular Shift ... #Hyperkalemia #Nephrology ... Diagnosis #Algorithm #Causes
Hypokalemia Differential Diagnosis Algorithm

Low intake 
• poor oral intake 

Renal loss 
• Medication 
• Hypomagnesemia 
•
Diagnosis Algorithm Low ... Medication • Hypomagnesemia ... Transcellular shift ... Diagnosis #Algorithm #Causes ... #Classification
Potassium Electrolyte Repletion
If patient also has hypomagnesemia, replete magnesium before repleting potassium
Oral:
 • Pills (ask pharmacy
Potassium Electrolyte ... patient also has hypomagnesemia ... , replete magnesium ... before repleting potassium ... Intravenous (can cause
Hypomagnesemia - Etiologies by Mechanism

Decreased GI Uptake 
 - Poor dietary intake (particularly common in alcoholics)
Hypomagnesemia - ... Differential #Diagnosis #Low ... #Magnesium #Table ... #Classification ... #Causes #Workup
Causes of Hypomagnesemia
 • Redistribution: IV glucose, Correction of diabetic ketoacidosis, IV hyperalimentation, Refeeding after starvation,
Causes of Hypomagnesemia ... osmotic diuresis, Potassium ... #Causes #differential ... #diagnosis #nephrology ... #magnesium #low
Antiarrhythmic Drugs

CLASS IA
 • Procainamide, Quinidine, Disopyramide
CLASS 1B
 • Lidocaine, Mexiletine
CLASS 2
 • Propranolol, Esmolol
CLASS 4
• Adenosine, Magnesium ... , Potassium # ... #Medications #Classes ... #Classification
Causes of Hypomagnesemia - Differential Diagnosis Algorithm
GI LOSS - FeMg < 2-2.5% or 24h Urine Mg
Causes of Hypomagnesemia ... CNIs • Familial hypomagnesemia ... @kdjhaveri #Hypomagnesemia ... #Magnesium #Low ... #Causes #Differential