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Infectious Disease EXAM 4 - Parasitic Diseases
Infectious Disease EXAM 4 - Parasitic Diseases
29
Pharmacology
Graduate
02/16/2011

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Term
symptomatic giardiasis/2nd-3rd trimester = metronidazole

pregnancy = paromomycin

pediatrics/metronidazole non-responders = nitazoxanide
Definition
treatment of giardiasis protozoal infection):
symptomatic
2nd-3rd trimester
pregnancy
pediatrics
non-responders
Term
resolution of diarreha (1-2 weeks)
cyst excretion (w/in days)
complete resolution of intestinal dysfunction (~3 months): transit time, radiologic changes
Definition
evaluation of giardiasis treatment protozoal infection)
Term
exclusive consumption of non-contaminated food and water
cook food adequately
boil or filter potentially contaminated water
iodine disinfection of water is more effective than chlorine treatment
treat asymptomatic carriers who may serve as a source of infection to others
adhere to strict hand washing protocol
dispose of diapers carefully
breast feeding confers some protection for nursing infants through secretory IgA - particularly important in developing countries
Definition
giardiasis prevention protozoal infection)
Term
luminal agents - mild to moderate infection:
(DIP)
diloxanide
iodoquinol
paromomycin in pregnancy

systemic agents - moderate to severe infection with liver involvement:
metronidazole
chloroquine
Definition
treatment of amoebiasis protozoal infection)
luminal agents
systemic agents
Term
monitor imaging
monitor stool samples over 1-3 months
GI involvement may resolve in 3-5 days
liver involvement may resolve in 7-10 days (may continue to heal for up to 8 months). if no response may require abscess aspiration/exploratory laparotomy
Definition
evaluation of amoebiasis treatment protozoal infection)
Term
adequate sanitation and eradication of cyst carriage

in high risk areas, infections may be minimized by:
avoidance of unpeeled, uncooked fruits and vegetables that may have been washed in local water
use of bottled water
disinfection by iodination is recommended b/c cysts are resistant to readily attainable levels of chlorine

there is no effective pharmacologic prophylaxis
Definition
amoebiasis prevention (protozoal infection)
Term
may be used to treat giardiasis and amoebiasis
it is a nitroimidazole
no alcohol, possible urine discoloration, and may cause dizziness
Definition
clinical pearls of metronidazole
Term
can be used in pregnancy for giardiasis and amoebiasis
aminoglycoside
renal and ototoxicity
Definition
clinical pearls for paromomycin
Term
can be used for giardiasis in metronidazole non-responders
prodrug, active metabolite is tizoxanide
patients should take with food
Definition
clinical pearls of nitazoxanide
Term
can be used for amoebiasis
halogenated hydroxyquinoline
amebicidal, intestinal
Definition
clinical pearls of iodoquinol
Term
mebendazole
albendazole

follow-up stool sample to ensure eradication and 2nd course of treatment PRN continued infection
Definition
treatment of hookworm disease (helminth infection)
Term
improvements in fecal sanitation
use of footwear
iron supplementation of food in endemic areas
periodic mass therapy in endemic areas (expensive)
significant protective immunity to intestinal nematodes appears not to develop naturally in humans. vaccine development is being pursued.
Definition
hookworm disease prevention (helminth infection)
Term
mebendazole
albendazole
Definition
treatment of ascariasis (helminth infection)
Term
pyrantel pamoate
mebendazole
albendazole

all bedding and clothing should be washed
additionally, frequent hand washing and clipping fingernails to decrease ongoing transmission and re-infection
Definition
treatment of enterobiasis (pinworm)(helminth infection)
Term
enterobiasis (pinworm)
strongyloidiasis
Definition
parasitic infections that can be transmitted by autoinfection
Term
ivermectin
albendazole

hyperinfection
D/C immunosuppression
initiate ivermectin
periodic screenings to ensure eradication
Definition
treatment of strongyloidiasis (helminth infection)
Term
prevention of initial infection:
improved fecal sanitation in endemic areas
avoidance of skin contact with potentially contaminated soil

screening/treatment of at-risk patients before initiation of immunosuppressive therapy
Definition
strongyloidiasis prevention (helminth infection)
Term
albendazole
praziquantel

pharm treatment generally deemed controversial, surgical options may be considered
Definition
treatment of cysticercosis/neurocysticercosis (helminth infection)
Term
eradiation of cysticerci by:
adequate cooking of infected pork
exposure to temperatures as low as 56 C for 5 minutes
refrigerate or salting for long periods
freezing at -9 C for 9 days

minimize opportunities for ingestion of fecally derived eggs through:
good personal hygiene
effective fecal disposal
treatment and prevention of human intestinal infections
Definition
prevention of cysticercosis/neurocysticercosis (helminth infection)
Term
mebendazole: used for hookworm, ascariasis, and enterobiasis (pinworm) = helminth infections
albendazole: used for hookworm, ascariasis, enterobiasis (pinworm), strongyloidiasis, and cysticerosis/neurocysticerosis = helminth infections

may take weeks to see results and focus on education to avoid reinfection and further spread of parasite
Definition
clinical pearls of benzimidazole class
Term
used for enterobiasis (pinworm) = helminth infection

may cause dizziness and somnolence
Definition
clinical pearls of pyrantel pamoate
Term
used for stronyloidiasis = helminth infection

may cause orthostatic hypotension
take drug on an empty stomach with water: 2.5x increase in BA when taken w/ food
taking w/out food limits side effects
Definition
clinical pearls of ivermectin
Term
used for cysticerosis/neurocysticerosis = helminth infections

may cause diziness
Definition
clinical pearls of praziquantel
Term
TREATMENT DEPENDS ON GEOGRAPHICAL AREA, RESISTANCE/SENSITIVITY PATTERNS, AND PLASMODIUM SPP.

chloroquine or hydroxycholoroquine
atovaquone-proguanil
artemether-lumefantrine
mefloquine
quinine + tetracycline or doxycycline
quinidine + tetracycline, doxycycline, or clindamycin
artesuante - not available in the US
Definition
treatment options for malaria
Term
dosed per body weight
should not exceed adult dosing
tetracycline and doxycycline not recommended (patients < 8 yo)
Definition
treatment of malaria in pediatrics
Term
malaria parasite sequester and replicate in the placenta
many complications including miscarriage and death of the fetus
3x more likely to develop severe infection vs. non-pregnancy females
may require alternative medications: chloroquine, quinine, clindamycin recommendation depends of resistance/susceptibility patterns
risk vs. benefit assessment (most are category C/D
lactation consideration post delivery
Definition
treatment of malaria in pregnancy
Term
malarone, chloroquine, hydroxychloroquine, doxycycline, mefloquine, primaquine

treatment selection:
geographic area of travel
resistance/sensitivity patterns

generally 1-2 days before travel, qd during stay, and continued 4 weeks post travel
exception: malarone - 1-2 days before, during, and 7 days after

primaquine: considered for terminal prophylaxis, contraindicated for G6PD deficient individuals
Definition
malaria prophylaxis
Term
contact CDC - avoid outbreaks
plan daily activities to avoid peak exposure times and places, night better than day
wear appropriate clothing
mosquito netting
insecticides: DEET, picaridin, oil of lemon eucalyptus
treat clothing and other equipment: premethrin (pretreatment), DEET (reapplication post-wash)
Definition
malaria prevention
Term
premethrin - 10 minutes
malathion - 90 minutes
lindane - 4 minutes, dosed of length of hair
Definition
treatment of lice
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