Shit - Derm/Rheum UWorld

Question 1

LEMS vs MG

Answer 1

LEMS has proximal weakness (stairs and up form chairs), hypo or a-relfexia, autonomics (dry mouth, impotence).

Both can have ocular involvement (diplopia)

Question 2

flattened deltoid: nerve, injury, sensory and motor loss

Answer 2

Axillary (C5-C6)
Anterior dislocation of humerus (and and ext. rotated i.e. throwing a ball)
Sensory = lat. arm
Motor = deltoid and teres minor

Question 3

Painful red joint with WBCs; cell count differential

Answer 3

20 000 = gonococcal arthritis

Question 4

Causes of gout

Answer 4

Thiazides, fatty meals, alcohol, Leish-Nyhan, PRPP excess, cell turnover, von Gierke disease

Question 5

Causes of pseudogout

Answer 5

hemochromatosis, hyperparathyroidism, OA

Question 6

Gout vs pseudogout

Answer 6

gout = monosodium urate.
pseudogout = calcium pyrophosphate

Question 7

Terbinafine use and mechanism

Answer 7

dermatophytes, especially onychomycosis; block squalene epoxidase

Question 8

Lower trunk of brachial plexus injury: name, nerves, s/s

Answer 8

Klumpe’s palsy.
C8 + T1 .: median and ulnar
All intrinsic hand muscles, total claw hand, sensory of medial forearm

Question 9

how to injure radial nerve:

Answer 9

midshaft humerus fracture, crutches, armpit chair

Question 10

increase supraspinatus pain with what arm movement

Answer 10

abduction

Question 11

caudal regression syndrome

Answer 11

via poorly controlled maternal diabetes. Genesis of sacral and lumbar spine, flaccid leg paralysis, dorsiflexed feet, urinary incontinents

Question 12

pre-patellar brusitis via

Answer 12

kneeling

Question 13

male-pattern baldness (androgenic alopecia) inheritence

Answer 13

polygenic with variable penetrance, with androgen-R on the X-chromosome

Question 14

isotrenitoin =

Answer 14

acutane: interacts with RAR so teratogenic