Scabies Flashcards
Etiology of scabies
mite Sarcoptes scabiei
Patho physiology of scabies ,sarcoptes scabies ?
mite burrows into the skin, laying its eggs in the stratum corneum
clinical features of scabies ?
widespread pruritus
linear burrows on the side of fingers,
interdigital webs and flexor aspects of the wrist
in infants the face and scalp may also be affected
what are the complication of scabies ?
due to scratching: excoriation, infection
The intense pruritus associated with scabies is due to what reaction ?
delayed-type IV hypersensitivity
Intense pruritus associated with scabies occurs when ?
about 30 days after the initial infection
first line management of scabies ?
permethrin 5% is first-line
second line of management of scabies ?
malathion 0.5% is second-line
what should be advised to the patient when taking scabies treatmnet ?
pruritus persists for up to 4-6 weeks post eradication - does not need treatment for this will eventually cease
how should the insecticide cream be applied according to BNF ?
all areas, including the face and scalp (contrary to manufactures advice )
apply to cool, dry skin
pay close attention to areas between fingers and toes, under nails, armpit area, creases of the skin such as at the wrist and elbow
reapply if insecticide is removed
how long should permethrin be left on the skin for ?
allow to dry and leave on the skin for 8-12 hours for permethrin
how long should malathion be applied for ?
for 24 hours for malathion, before washing off
should treatment such as the permethrin 5% is first-line or malathion 0.5% is second-line be repeated ?
Yes repeat treatment after 7 DAYS ALWAYS !!!
what is crusted Crusted (Norwegian) scabies?
crusted skin will be teeming with hundreds of thousands of organisms - een in patients with suppressed immunity, especially HIV
TX of choice in Crusted (Norwegian) scabies?
Ivermectin
