Gastro + renal

Question 1

What is the most common cause of melanosis coli on colonoscopy?

Answer 1

laxative abuse

Question 2

What are the 3 stool electrolyte rules?

Answer 2

Increased Cl = chloride losing diarrhoea
If Na >70 = secretory diarrhoea (best sign)
If 2x(Na + K) + 50 < fecal osmolality (~290) = osmotic diarrhoea

Question 3

What is the most common cause of acute renal failure in young children?

Answer 3

HUS