Water and eletrolyte-9

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Topic: Water and eletrolyte-9

Posted on: November 24, 2016

Patient no 1
A 55 year old male has cough and haemoptysis for the last one year. He
is also having diarrhoea for the last one day.
Results of his biochemical tests are as following:

• Na: 118 mmol/L (132-144)
• K: 4.4 mmol/L (3.2-4.8)
• Urea: 4.3 mmol/L (3.6-6.7)
• Creatinine: 83 µmol/L (60-95)
• Glucose (F): 5.3 mmol/L (<5.6)

a. Write TWO most important differential diagnosis in this patient

b. Name ONE simple, commonly available test which can be used to
differentiate the two conditions.

a. SIADH and Hypovolumic Hyponatraemia
b.Urine Sodium
Disorders of Plasma Sodium — Causes, Consequences, and Correction
N Engl J Med 2015;372:55-65. DOI: 10.1056/NEJMra1404489

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