Infection Flashcards
Example of an antiprotozoal used in amoebic infections
Mepacrine hydrochloride
Safest antibiotic classes in pregnancy
Penicilins and Cephalosporins
Signs and symptoms of infection
fever, inflammation, drowsiness in children, confusion in elderly, worsening of renal function
Clinical markers of infection
Raised CRP, Low BP, High ESR, temperature, Resp rate, pulse
what antibiotic classes must be avoided in children?
Tetracyclines (<12)
Quinolones cause arthropathy
What antibiotic has the largest risk of C diffe
Clindamycin
What type of antibiotics are related to adverse reactions e.g. fungal infections and antibiotic associated collitis/
Broad spectrum e.g. Cephalosporins
Examples of notifiable diseases
- Anthrax -Cholera
- Botulism -Brucellosis
- Diarrhoea (infectious/bloody)
- Diptheria -Encephalitis(acute)
- Food poisoning
- haemolytic uraemic syndrome
- viral hepatitis -Legionnaires
- Leprosy -Malaria -measles
- meningitis -meninigococcal septicaemia - mumps
- paratyphiod fever -plague
- polio -rabies -rubella -SARS
- scarlet fever -Smallpox
- Strep (group A) -tetanus -TB -typhoid fever -typhus -whooping cough -yellow fever
What antibiotic is used in rheumatic fever to prevent recurrence?
Phenoxymethylpenicillin or sulfadiazine
What antibiotic is used in invasive strep A infection to prevent recurrence?
Phenoxymethylpenicilin (if pen allergic -> erthyromycin or azithromycin
What antibiotcs are used to prevent secondary menigococcal infection to exposed people?
Ciprofloxacin or Rifampicin
What antibiotic is used in haemophilus influenza type B to prevent secondary cases?
Rifampicin - if therre are vunlerable occupants in household
What antibiotic is used for diptheria in non immunocompromised patients to presvent secondary cases?
Erthyromycin - treat for further 10 days if swab +ve after 7 days of treatment
Antibiotic therapy used for prophylaxis of pertussis
Clarithromycin
Asplenia prophylaxis antibiotic of choice
Phenoxymethylpenicilin
Antibiotic of choice following animla bites
co-amoxiclav (or doxy + metro)
If a patient is having a GI procedure, what antibiotic should be given as a single STAT dose
Gent / cefuroxime / Co-amox up to 30 mins before procedure
If MRSA +ve - vanc/teic
Examples of antipseudomonal antibiotics
Pip-Taz, ticarcillin with clavulanic acid
What first line antibiotics should be given to suspected Meningococacal septicaemia patients
- Benz pen OR cefotaxime OR chloramphenicol
What antibiotics are used to eliminate nasipharyngeal carriage of meningitis?
Ciprofloxacin or rifampicin
Antibiotics that can cause cholestatic jaundice
Co-amoxiclav + flucloxacillin
Antbitocs contraindicated in pregnancy
tetracyclines, trimethoprim, nitrofurantion (causes nausea; avoid at term)
Antibiotics to avoid in pregnancy
Metronidazole, Chloramphenicol, aminoglycosides and Tetracyclines, Quinolones and sulphonamides
Generally, what antibiotic is used for staphylococci infection?
Flucloxacillin
Generally, what antibiotic is used for MRSA infection?
Vancomycin
Generally, what antibiotic is used for Anaerobic infection?
Metronidazole
Generally, what antibiotic is used forpseudomonas taphylococci infection?
Gentamicin
Generally, what antibiotic is used for streptococci infection?
Phenoxymethylpenicilin or Benpen
If menigitis is caused by listeria, how should it be treated?
Amoxicilin + Gentamicin for 21 days
If a patient is over 50yrs and has meningitis, how do we treat them?
/Cefotaxime (or ceftriaxone) + AMOXICILLIN
Antibacterial of choice for otitis externa
flucloxacillin ( or clari if pen allergy. If pseudomonas suspected, give Cipro)
Signs of otitis media
Effusion, common in children, can be systemically unwell
When should antibiotics be offered to patients with OE
if systemically unwell e.g. fever or if there is otorrhoea or if pt <2 with bilateral OE
Give amoxicilin or clari if pen allergic
Ear symptoms that would requrie referral
Dizziness or tinnitus Pain in the middle ear Fever and malaise in children (signs of systemic infection) Foreign body Deafness Inflammation of the pinea
What is the active ingredient in Sofradex
Framycetin 0.5%, Dex 0.05% and Gramicidin 0.005%
Active ingredient in locorten vioform
Flumetasone / ciloquinol 0/02%
What is the brand ofr neomycin + dexamethasone + acetic acid ear spray?
Otomize
antibiotic choice in Salmonella
Cipro or ceftotazidime
Antibiotic choice in campylobacter
clarithromycin
Treatment of C diffe
metronidazole PO for 10-14 days
OR Vanc PO OR Fidaxomicin
Antibioti choice for chlamydial infection
Doxycyline or Azithromycin for 7 days
Organisms that can cause sinusitis
Strep pneumoniae, Heam.influenzae, Moraxella catharrhalis
Should antibiotics be offered to all patients wiht ? sinusitis?
No - only those systemicall unwell with symptoms for 10 days or morer
First line antibiotics for Bronciesctasis or COPD acute exacerbations or
Doxy or Clari or amox
First line antibiotics for non severe CAP
Amoxicillin
First line antibiotic for moderate severity CAP
Amoxicilin + Clarithromycin or Doxy alone
High severity CAP treatment
Benzpen + clari
Atypical pneumonia first line antibiotic
Clari
HAP early onset natibiotic choice
co-amoxiclav
Treatmet for Impetigo if small areas of skin infected
Fusidic acid topical ( 7 days) or if MRSA mupirocin topical
Treatmet for Impetigo if widespread infection
PO flucloxacillin
Treatment for cellulitis
High dose flucloxacillin
Examples of aminoglycosides
Neomycin, amikacin, tobramycin, gentamicin, streptomycin
What type of bacteria is Gentamicin active against
many gram -ve (inc. P aeruginosa) and some gram +ve –> inactive against Anaerobes
Side effects of aminoglycosides
Nephrotoxic
Otoxic
Hypocalcaemia + hypokalaemia + hypomagnesaemia
May impair neuromusculae transmission (CI in MG)
If a patient has renal impairment and is prescribed an aminoglycoside, what must be done to the dosage interval?
increase the interval so there is more time for the drug to be excreted
What condition is AG contraindicated in?
Myasthenia Gravis
Why is IBW used to calculate Gentamicin doses>
AG are hydrophilic - to avoid excessive dosing in obese patinets
When should Gentamicin levels be taken and what is the aim?
For OD dose regimes: pre dose <1mg/mL
For multi dose regimes: take 1 hour after dose (5-10mg/mL) and trough levels (<2mg/mL)
If a gentamicin pre-dose conc is high, what should be done
increae the dosing interval
If an aminglycoside post dose level is high what should be done?
Reduce the dose of AG
MHRA alert for histamine related reaction was associated with which aminoglycoside?
Gentamicin
What antibiotics are broad spec and beta lactams?
Carbapenems
Are carbapenems active against methicillin resistant staph aureus?
No
Examples of Carbapenems
Meropenum and Imipenem
What antibiotics are cautioned in penicilin allergy?
Carbapenems
Which carbapenem is not active against P.aeruginosa?
Ertapenem (used for CAP, abdominal and gynae infection)
Why is imipenem given with Cilastatin?
Cilastatin is an enzyme inhibtor that blocks imipenems renal metabolism as kidneys partially inactive imipenem
Which carbapenem has the least seizure inducing potential?
Meropenem
What is the interaction between carbapenem and sodium valporate?
Carbapenems decrease the concentration of sodium valp as low as 10% - increasing sodium valp dose does nto counteract the interaction
What spectrum are cephalosporins?
Broad spec
Example of 1st gen cephalosporin
Cephalexin (often used in UTI, safe in pregnancy)
Example of 2nd gen cephalosporin
Cefuroxime (more activity against gram -ve bacteria)
Example of 3rd gen cephalosporin
Ceftriaxone and Ceftazidime (ceftazidime is active against pseudomonas)
Which cephlasporin can cause gall bldder stones?
Cetriaxone - caution in history of hypercalciuria
Examples of glycopeptides
vanc + Teic
What spectrum are glycopepetides active against
Gramm +ve only
Side effects of glycopeptides
Red man syndrome ( if infused too fast), nephrotxocitiy and otoxicity
What is the aim for Vancomycin trough levels?
10-20mg/L
Which antibiotic is well concentrated into bone and exreted in bile and urine?
clindamycin
Which antibiotic is most liley ot cause antibiotic associated colitiis?
Clindamycin
What is a caution associated wiht Macrolides?
Can prolong QT
Which macrolide is QDS dosing and which is BD?
QDS = erythromycin (more GI s/e) BD = clarithromycin
Macrolides can cause drug interactions. Why?
They are enzyme inhibitors so can increase levels of warfarin, statins, CCBs, Apixaban, digoxin etc
What condition can Azithromycin be sold as a max 1g dose for OTC?
Asymptomatic chlamydia trachomatis gential infection
Counselling points with metronidazole
Take with food, avoid alcohol and for48 hours after treatment, may darken urine
Which antibiotics are penicillinase resistant?
Flucloxacillin and Temocillin
what antibiotics are antipseudomal penicilins?
Pip-taz (4.5g TDS)
Amoxicilin peadiatric doses
Age 1-11months: 125mg TDS
Age 1-4 years: 250mg TDS
Age 5-17 years: 500mg TDS
What is the only oral antibiotic agaisndt P..aeruginosa
Ciprofloxacin
What drug in conjunction to a quininole can increae the risk of convulsions
NSAIDS
What is the MHRA alert regarding quinolones
Tendon ruptue and damage - CI if history of tendon disorders following quinolone use
Concomittant therapy with what drug increases the risk of quinolone induced tendon rupture?
Corticosteroids
what antibiotic class is associated with an MHRA alert regarding increased risk of Aortic anerusym and dissection?
Quinolones
What conditions are quinolones cautioned in
QT prolongation, arthropathy in children, epilepsy, G6DP deficiency, excessive exposure to sunlight
What medication interacts with Trimethoprim / co-trimz>
Methotrexate
Dose of trimethoprim for UTIS
200mg BD (occassionally 100mg ON for UTI prophylaxis)
What is the name for trimethoprim + sulfamethoxazole
Co-trimoxazole
What antibiotic is used ofr PCP infection
Co-trimox 120mg/kg/day for treatment and 960mg for propylaxis dose (noramally M/W/Fri)
What must you monitor for with trimethoprim/co-trimox?
Blood disorders (leucopenia, thrombocytopenia, aneamia)
How should tetracyclines be taken?
Swallow whole, avoid exposure to sunlight, indigestion remedies/zin iron 2 hours before or after
Which tetracycline holds the greatest risk of SLE?
Minocycline
Why should chloramphenicol be avoided in babies?
Grey baby syndrome risk
What needs to be monitored during daptomycin therapy
Creatine phosphokinase - before and then at least weekly during treatment + renal function
What are the mhra warnings associated wiht Linezolid?
- Optic neuropathy
2. Blood disorders
What is the risk of using linezolid in combination wiht SSRIS
Serotonin syndrome
What is Rifaximin used for?
Travellers diarhorrea and recurrence of hepatic encepthalopathy
Nitrofurantoin has the risk of what neuropathy?
Peripheral neuropathy
When is antiviral treatment needed for children with chickenpox?
If <1 month i.e. neonate
What is herpes Zooster more commonly known as
Shingles
What drug is used for herpes zooster (systemically) and herpes simplex (topically)
Aciclovir
Valaciclovir can be used for what form of herpes?
Genital herpes
What is Ganciclovir used to treat?
CMV
What is Oseltamivir licensed for use for?
flu - start within 48 hours