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Flashcards in CPS Infectious Diseases Deck (347)
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1

What is the risk of mortality from IE due to strep viridans infection of prosthetic valves vs. of native valves?

Prosthetic valves: 20%Native valves: 5%

2

What are the 7 indications for prophylaxis against IE in patients undergoing dental procedures?

1. Previous infective endocarditis2. Prosthetic cardiac valves3. Cardiac transplant recipients who develop cardiac valvulopathy4. Unrepaired cyanotic congenital heart disease (including palliative shunts and conduits)5. Completely repaired cyanotic CHD with prosthetic material or device during the first 6 months after procedure (ie. until endothelialization of prosthetic material occurs)6. Repaired CHD with residual defects at site of prosthetic patch or device (incomplete endothelialization)7. Rheumatic heart disease if prosthetic valves or material used in valve repair

3

What is the most common underlying condition that predisposes to the acquisition of IE in the western world?-prophylaxis prior to dental procedure?

Mitral valve prolapse-no abx prophylaxis since the absolute incidence of IE is extremely low in this population AND IE with MVP is usually not associated with horrible outcomes as in cyanotic CHD

4

Which dental procedures require abx prophylaxis for IE?

1. Manipulation of gums2. Involvement of periapical region of teeth3. Perforation of oral mucosa

5

What is the preferred antibiotic for IE prophylaxis prior to dental procedure? -dose?-when to administer?-2nd option for allergic people

Amoxicillin (well absorbed, high serum concentrations)-50 mg/kg x 1 dose 30-60 mins before procedure OR up to 2 hrs after-2nd options: clindamycin or clarithromycin

6

What respiratory tract procedures requires IE abx prophylaxis for high risk patients?

Any procedure that involves incision or biopsy of the respiratory mucosa-ex. T&A

7

What GI or GU tract procedures requires IE abx prophylaxis for high risk patients?

Prophylaxis is no longer recommended in these patients UNLESS they already have an established GI or GU tract infection, then the abx should have activity against enterococcus (amp or vanco)

8

What are the 3 most common clinical presentations of invasive group A strep infections?

1. Soft tissue infection: Nec fasc or myositis2. Bacteremia 3. Pneumonia

9

In pediatric populations, what is a prominent risk factor for developing an invasive GAS infection?

Varicella infection

10

What is the diagnostic criteria for GAS Toxic Shock Syndrome?

Hypotension + at least two of the following:1. Renal impairment2. Coagulopathy (decreased platelets or DIC)3. Liver enzyme or function abnormality4. ARDS5. Generalized erythematous macular rash that may desquamate **Think hypotension + involvement of at 2 organ systems (heme, renal, liver, derm, lungs)

11

Who is considered a close contact of a person with invasive GAS infection? (7)

1. Household conatcts who have spent at least 4 hr per day on average in previous week 2. Shared the same bed or had sex3. Direct mucous membrane contact (kissing, mouth to mouth resusc, touched open skin lesion)4. Injection drug users who shared needles5. Share long term care facility6. Share home daycare7. Selected hospital contacts

12

What is the recommendation on who should receive chemoprophylaxis for GAS invasive infection?-when should chemoprophylaxis occur?-what advice should be given to close contacts?

Who should receive:1. Close contacts of a confirmed case of SEVERE GAS invasive infection (TSS, nec fasc, meningitis, pneumonia) who have been exposed during the period from 7 d before onset of symptoms in the case to 24 hr after the initiation of abx in the case-chemoprophylaxis should start ASAP (within 24 hr of case identification is ideal but can be up to 7 d after the last contact with the case)-advise close contacts on s/s of GAS infection and to see MD asap if febrile or other s/s of GAS within 30 days of diagnosis in index case

13

What is the definition of confirmed case of GAS?

Laboratory confirmation of GAS infection (isolation of GAS from a normally sterile site) with or without clinical evidence of invasive disease

14

What is the preferred chemoprophylaxis agent for close contacts of GAS invasive infection?-alternative agents?-alternative agents for beta-lactam allergy?

1st generation cephalopsporin (cephalexin)-alternative agents: 2nd or 3rd generation cephalosporin (cefuroxime axetil and cefixime)-beta lactam allergy: macrolides (but concern with macrolide-resistant GAS) or clindamycin**NOTE: penicillin is LESS effective than cephalosporins for eradicating GAS COLONIZATION

15

What is the recommendation on whether routine cultures should be drawn on close contacts of GAS invasive infection receiving abx chemoprophylaxis?

No routine cultures are required unless symptomatic

16

What is the antibiotic of choice for treating severe invasive GAS infection?-additional treatment to minimize/neutralize the effects of toxin production?-additional treatment of GAS toxic shock syndrome?

Treatment of choice: penicillin (no resistance to date)-add clindamycin to inhibit protein synthesis and thus decrease toxin production (should never be used as monotherapy though since 1-2% of GAS is resistant to clindamycin)-for GAS TSS, add IVIG single dose 1-2 g/kg

17

What is Palivizumab?-dose, route, timing of administration-how much is a dose?

RSV-specific monoclonal antibody - used for preventing and reducing RSV hospitalization rate of high-risk children-15 mg/kg IM q30days during RSV season x 5 months max-cost of 1 dose: ~$1100-no evidence showing that it prevents significant mortality

18

The majority of RSV hospitalizations occur in what group of infants?

Term infants with no pre-existing risk factors

19

What is the drug efficacy of palivizumab for prevention of RSV and associated hospitalizations?

55%

20

Which high-risk children should receive palivizumab to prevent RSV hospitalization? (3)

1. Children with CLD or HD CHF if <12M

2. Preterm infants <30+0 if <6 months at start of RSV season

3. Remote requiring air transport before 36+0 and <6M at start

4. Consideration for term inuit if <6M and high RSV hospitalization rtes

21

What is the recommendation for use of palivizumab in children with immunodeficiencies, Down syndrome, cystic fibrosis, upper airway obstruction or a chronic pulmonary disease other than chronic lung disease of prematurity?

Not routinely recommended BUT may be considered for children

22

What is the incubation period of chicken pox?

10-21 days after contact

23

When is the highest concentration of VZV DNA detected in the nasopharyngeal secretions in terms of day of rash? -when is transmission the greatest?

Highest concentration on day one of rash-the children with the highest level of ciremia will obviously be the sickest with higher fevers and more vesicles-transmission is the greatest in the prodrome period (the day before onset of rash)

24

What is the policy for isolation precautions in hospital for children with known exposure to chicken pox?

When a child has been exposed to chicken pox and is staying in hospital, they should be placed in isolation from day 8-day 21 from the day of contact (since incubation period is 10-21 days before they'll be able to transmit the virus to others so you're starting 2 days before the shortest incubation period)) -prevents other children on the ward from being exposed to VZV in the days before the exposed child develops the overt rash

25

What is the recommendation on when a child with mild chicken pox can return to school or daycare?

Should be allowed to return to school or daycare as soon as they are well enough to participate normally in all activities, REGARDLESS OF THE STATE OF THE RASH

26

When would you order a CBC and blood culture in a child diagnosed with pneumonia? (2)

1. Clinically worsening2. Hospitalized

27

What are features of atypical pneumonia (ie. mycoplasma pneumoniae)? (5)-treatment?

1. Subacute onset2. Prominent cough3. Minimal leukocytosis4. Nonlobar infiltrate5. School aged child-treatment: clarithromycin or azithromycin

28

What is the antibiotic treatment for:-nonsevere pneumonia-severe pneumonia

Nonsevere: high dose amoxil or amp IVSevere: ceftriaxone IV or cefotaxime IV plus clarithromycin PO or azithromycin PO/IV

29

What is the treatment for a child with proven or clinically suspected influenza plus evidence of secondary bacterial pneumonia?

1. Consider adding antiviral for influenza2. Amoxi-clav PO or cefuroxime IV for non severe3. Ceftriaxone IV or cefotaxime IV + clarithromycin PO or azithromycin PO/IV**some experts recommend adding cloxacillin

30

What is the treatment for a child with pneumonia and moderate-to-large effusion?

1. Consider pleurocentesis2. Ceftriaxone or cefotaxime IV**some experts recommend adding clindamycin