Necrotising fascitis Flashcards

1
Q

Definition of necrotising fasciitis

A

Rapidly progressive inflammatory infection of the fascia- progresses along fascial planes
Secondary necrosis of subcutaneous tissue and skin

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2
Q

Epidemiology of necrotising fasciitis

A

Increased incidence
Around forty years
Rare in children
Diabetics, alcoholics, cirrhosis

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3
Q

Risk factors for necrotising fasciitis

A
Diabetes
Cancer
Cirrhosis
Renal failure
NSAID use in varicella
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4
Q

Symptoms of necrotising fasciitis

A

Early: hard to recognise
Rapid progression to intense pain
Fever
Myalgia

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5
Q

Signs of necrotising fasciitis

A

Initial trivial lesion
then erythema
then purple
then gangrenous

Oedema
Vesicle- clear or bloody
Crepitus/gas gangrene

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6
Q

Investigations of necrotising fasciitis

A

Clinical diagnosis
Treat without delaying for investigation

High WCC
High urea
ABG
Cultures- blood + tissue

Look for streptococcal pyrogenic exotoxin

MRI

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7
Q

Aetiology of necrotising fasciitis

A

Infection of fascia by Group A streptoccoccus

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8
Q

BONUS: causative organism of erysipelas?

A

Group A beta haemolytic streptococcus- strep pyogenes

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