Session 5- Fluid replacement therapy

Question 1

what is tonicity

Answer 1

the measure of the effective osmotic pressure gradient of 2 solutions separated by a semipermeable membrane

Question 2

what is the TBW of a newborn baby

Answer 2

75%

Question 3

what is the TBW in the elderly

Answer 3

45%

Question 4

what happens to cells in hypernatraemia

Answer 4

cell shrinkage

confusion/ seizures

Question 5

what happens in cells in hyponatraemia

Answer 5

cell swelling

cerebral oedema
headache/seizures

Question 6

where does dextrose distribute when given

Answer 6

across all three

ICF
ECF- interstitial fluid and intravascular

Question 7

where does saline distrubute

Answer 7

it is isosmotic with plasma so doesnt move from ECF TO ICF remains in ECF

Contains sodium which remains in the ECF

no change in osmolarity

Question 7

where does saline distrubute

Answer 7

it is isosmotic with plasma so doesnt move from ECF TO ICF remains in ECF

Question 8

where does hartmans distribute

Answer 8

isosmotic to plasma so stays in ECF

majority retained in the ECF as osmolarity maintained with effective osmoles sodium, potassium and calcium