MSK path III Flashcards

1
Q

polymyositis

A

adult onset inflammatory myopathy that shares myalgia and weakness with dermatomyositis but lacks cutaneous features

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

mononuclear inflammatory cells in endomysial location

A

polymyositis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

CD68

A

macrophages

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

inclusion body myositis

A

late adulthood >50 years old

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

most common inflammatory myopathy in adults >65 y.o

A

inclusion body myositis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

presentation inclusion body myositis

A

slowly progressive muscle weakness that tends to be most severe in quads and distal Upper extremity muscles

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

trichrome stain

nuclei in center of muscle cells and myofibers have rimmed vacuoles

A

polymyositis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Main Tx for inflammatory myopathies

A

corticosteroids

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

steroid R disease of inflammatory myopathies

Tx?

A

azathioprine, MTX, IV Ig, cyclophosphamide, cyclosprine, rituximab

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

will Tx work for inclusion body myositis

A

responds poorly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

most common complication statins

A

myopathy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

thyrotoxic myopathy

A

acute or chronic proximal muscle weakness, precedes other Sx hyperthyroidism

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Bindge drinking can cause what myopathies

A

rhabdomyolysis, myoglobinuria and renal failure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

what type of atrophy does alcohol cause in muscle

A

type II atrophy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

chromosome 19q13.1 assoc with what gene

inheritance

A

RYR1- autosomal dominant

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

clinical findings of mutation in RYR 1

A

floppy infant
scoliosis, hip dislocation, foot deformities,
malignant hyperthermia!!!

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

muscle cells show cytoplasmic cores with central zones of abnormal sarcomeres and decreased mitochondria thorughout

A

RYR1 mutation

“central core disease”

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is NEM

A

nemaline myopathy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

presentaiton NEM

A

weakness, hypotonia

floppy infant

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

histo NEM

A

spindle shaped particles in type I fibers

gomori stain is best

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

clinical findings centronuclear myopathy

A

floppy infant
poor prognosis in X linked form
weakness and hypotonia

22
Q

histo centronuclear myopathy

A

nuclei in center of myofiber especially type I

23
Q

mutation in centronuclear myopathy

A

XL- myotubularin gene MTM1

CNM2 gene

24
Q

progressive muscle damage that manifests between childhood and adulthood

A

muscular dystrophies

25
most common muscular dystrophies have what inheritance and what is dysfucntional
X linked | mutation in dystrophin
26
syndromes from loss of function in dystrophin gene on X chromosome
duchenne and becker
27
when are duchenne and becker usually Dx
around a year because slow at walking
28
what does dystrophin do
linkts actin to syntrophins | raltionship between cell membranes and proteins
29
Bx in young boy mm show segmental myofiber degeneration and regeneration with atrophic myofibers no inflammation some fat infiltration
beckers or duchenne
30
absent normal sarcolemmal staining on immunohistochem
duchenne
31
reduced sarcolemmal staining on immunohistochem
becker
32
what is pseudohypertorphy
when because losing some muscle fibers the others try to compensate and grow big. look like have big muscles, but lots is fat
33
which muscular dystrophy still has some dystrophin
becker
34
sequelae of muscular dystrophy
joint contractures, scoliosis, worsening respiratory reserve, sleep hypoventilation
35
serum CK MM in dystrophy
elevated in first decade | then falls as disease progresses
36
what confirms muscular dystrophy
genetic studies
37
inheritance of myotonic dystrophy
auto dominant
38
myotonic dystrophy is associated with what other system disorders
skel mm weakness, cataracts, endocrinopathy and cardiomyopathy
39
what is myotonia
sustained involuntary contraction of muscles
40
what causes myotonic dystrophy
expansions CTG triplet repeats at 3' noncoding region of myotonic dystrophy protein kinase
41
what muscular dystrophy has mutations that encode nuclear lamina proteins
emery dreifuss muscular dystrophy
42
presentation of decrease in lipid or glycogen metabolism
msucle cramping and pain when exercise or fasting or slow progressive muscle damage without episodic manifestations
43
What is McArdles disease
cannot breakdown sugars
44
ragged red fibers
mitochondrial deficiency
45
phonogrpah record appearance of mitochonria
mitochondrial abnormality
46
myopathies from mitochondrial problems
elevated CK rhabdomyolysis weakness
47
what is spinal muscular atrophy
loss of motor neurons which leads to muscle weakness and atrophy
48
presentation spinal muscular atrophy
floppy infant
49
Sx of ion channel myopathy
elevated, depressed or normal serum K levels | "hyperkalmic, hypokalemic and normokalemic periodic paralysis"
50
malignant hyperthermia
hypermetabolic state: tachycardia, tachypnea, muscle spasms and hyperpyrexia
51
most common trigger for malignant hyperthermia
halogenated inhalaltional agents and succinylcholine
52
CD cells involved in polymyositis
CD8