Renal, Endo, Metabolism 1 - Hyponatremia

Question 1

2 Dx thresholds for critical illness-related corticosteroid insufficiency

Answer 1

baseline cortisol <10 µg/dL or increase <9 µg/dL after ACTH stim test

Question 2

LR+ =

Answer 2

sensitivity / (1 - specificity)

Question 3

LR-

Answer 3

(1 - sensitivity) / specificity

Question 4

normal serum osmolality

Answer 4

280-285 mOsm/kg

Question 5

High urine osm is >___ mOsm/kg

Answer 5

100

Question 6

Causes of hypotonic hyponatremia w/ high urine osm (3)

Answer 6

SIADH, adrenal insufficiency, hypothyroidism

Question 7

Urine sodium in SIADH

Answer 7

> 30 mEq/L

Question 8

serum uric acid in SIADH

Answer 8

<4 mg/dL

Question 9

FeUrea in SIADH

Answer 9

> 12%

Question 10

Give hypotonic fluids or _____ if you correct hyponatremia too quickly.

Answer 10

DDAVP