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Flashcards in Hyponatremia Deck (42)
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1

what is osmolarity?

measure of water balance

2

calculation for serum osmolarity

2[Na+] + [glucose]/18 + [urea]/2.8 + [EtOH]/4.6 = calculated
osm

3

what is the main determinant of serum osmolarity?

serum Na+

4

what is serum [Na+] a surrogate of?

water

5

what is serum [Na+] NOT a surrogate of?

Na+ content

6

what is an osmole?

amound of a substance that dissociate in solution to form one mole of osmotically ACTIVE particles

7

dysnatremias are a disorder of

WATER metabolism

8

volume regulation clinically defined by

effective arterial blood volume

9

water regulation clinically defined by

plasma osmolality

10

volume regulation clinically measured by

physical exam

11

water regulation clinically measured by

serum [Na+]

12

volume regulation regulated by

baroreceptors

13

water regulation regulated by

osmoreceptors

14

volume regulation hormones activated

renin, angiotensin, aldosterone, catecholamines, atrial natriuretic peptide, ADH

15

water regulation hormones activated

ADH

16

volume regulation evaluated by

urine Na+

17

water regulation evaluated by

urine osmolality

18

volume regulation treated by

giving or restricting SALT or VOLUME

19

water regulation treated by

giving or restricting WATER

20

how much water, how much volume in 1 liter of: 0.9% saline

- water 0 L
- volume 1 L

21

how much water, how much volume in 1 liter of: d5w

- water 1 L
- volume 0 L

22

how much water, how much volume in 1 liter of: 0.45% saline

- water 500 ml
- volume 500 ml

23

how much water, how much volume in 1 liter of: d5w w/ 3 amps NaHCO3

- water 0 L
- volume 1 L

24

how much water, how much volume in 1 liter of: 1/4% saline (39 meq NaCl)

- water 750 ml
- volume 250 ml

25

TBW equals?

60% weight

26

ICF = how much of TBW?

2/3

27

ECF = how much of TBW?

1/3

28

ISF = how much of ECF?

3/4

29

IVF = how much of ECF?

1/4

30

movement of fluid between ECF and ICF is determined by

Starling forces (hydrostatic, oncotic)