physio q.... - rawalian

[ArchivalUser]

A 70-kg (154-lb) man on a fixed NaCl intake
(200 mmol/day) is given daily injections of a
potent mineralocorticoid hormone for 4 days. He
has free access to water and consumes his usual
caloric intake. Excretion of NaCl is as follows:
Day NaCl (mmol)
1 30
2 90
3 180
4 200
Assuming that 1 L of 0.9% saline contains 150
mmol of NaCl and weighs 1 kg, how much will
this patient weigh (in kg) at the end of day 4?
(A) 66
(B) 68
© 70
(D) 72
(E) 74

[ArchivalUser]

is it "D"

[ArchivalUser]

E..

[ArchivalUser]

sarim or maryam can you guys PLEASE explain how you got the answer...thanx...

[ArchivalUser]

answer is D though...

[ArchivalUser]

the man was given 800 mmol of NaCl in 4 days (200 mmol/day)

out of 800, he lost 500 in the urine (30 + 90 + 180 + 200 =500)

so at the end of 4th day he's got 300 mmol NaCl in excess compared to initial state

150 mmol = 1 kg
300 mmol = 2 kg

Initial wt 70 kg + 2 kg (from excess 300 NaCl) =72 kg

[ArchivalUser]

THANx a lot that was helpful.. GL