ventilator associated pneumonia - critical care · ventilator associated pneumonia dr dushyanthi...
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VENTILATOR ASSOCIATED
PNEUMONIA
Dr Dushyanthi Perera
MBBS MD FRCA
Head of Critical Care and
Anaesthesia
Durdans Hospital
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WHAT IS VAP ?
A nosocomial pneumonia associated with
mechanical ventilation or intubation that
develops 48 -72 hours after hospital
admission and which was not incubating at the
time of admission.
American Thoracic Society 2005
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INCIDENCE
10 – 60 %
Most common nosocomial infection in ICU
(50% of ICU infections)
Incremental risk of VAP 1% per day of
ventilation
Tracheal intubation and ventilation 7 – 21 fold
increase the risk of pneumonia
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WHY DO WE CARE?
3 fold - Increase in hospital stay
Increasing cost ( $ 40,000/ patient)
Chest 2002
Higher mortality ( patients die with rather than
of VAP)
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CAUSATIVE ORGANISMS
Early Onset
H influenzae
Strp. Pneumoniae
Staph aureus
E coli
Klebsiella
Late Onset ( >5 d)
Pseudomonas
Acinetobacter
MRSA
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Most strains responsible for early onset VAP are
antibiotic sensitive
Late onset VAP is usually Multi Drug Resistant
Am J Resp Crit Care 1998
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Depends on
State of host defense
Virulence of the organism
Overwhelming inoculation
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PATHOGENESIS
There are 3 pathways of entry into the lower
respiratory tract
Aspiration from the oropharynx and GI tract
(Commonest)
Direct inoculation ( biofilm embolisation
during suctioning and bronchoscopy )
Inhalation of bacteria ( contaminated
aerosols)
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Aerodigestive colonization
Host factors Invasive devises/Sx Contamination medication
Aspiration
Tracheal colonization
Defense mechanisms compromised
Tracheobronchitis
Pneumonia Bacteremia GIT translocation
Inoculation/inhalation
Pathogenesis of VAP
Infect.med 20[5]248-259:2003
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WHO IS AT GREATEST RISK ?
Extremes of age
Malnutrition
Immunocompromised
DM/ Liver disease
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WHO IS AT GREATEST RISK?
Reintubation
Supine position
Impaired cough / depressed level of
consciousness
Oropharyngeal secretions
Presence of NG tubes and enteral feeding
Cross contamination by staff
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HOW DO WE DIAGNOSE? 2 – 1 - 2
CXR – 2 consecutive days
New, progressive or persistent infilterate
Consolidation , opacity or cavitation
At least 1 of the following
Fever with no other recognized cause
WBC < 4,000 or > 12,000
At least 2 of the following
New purulent sputum or change in quality of sputum
Creps or bronchial breathing
Worsening gas exchange
Dyspnoea or tachypnoea
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Am J Respir Crit Care Med.2005:171;388-416
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ANTIBIOTICS ?
Prompt treatment with appropriate AB can
improve outcome
Over treating
Increases bacterial resistance
Overlooks other sources of infection
Increases costs
Am J Resp Crit Care Med 2005
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ANTIBIOTIC SELECTION
Initial empiric and broad spectrum
Send gram stain and cultures prior to
commencing antibiotics
Rapid de-escalation once ABST is available
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WHAT SAMPLE DO WE SEND?
Diagnostic method Quantitative culture
(CFU / ml )
Sensitivity (%) Specificity (%)
Tracheal aspirate Non quantitative 78 19
Tracheal aspirate
Qauntitative
> 10 6 69 80
Bronchio-alveolar
lavage
> 10 4 86 87
Protected brush
specimen
>10 3 82 92
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CAN WE REDUCE IT ?
Modification of Specific ICU practices
Collaborative multidisciplinary approach
Intensive education of ICU personnel
( Doctors, Nurses and physiotherapists )
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PREVENTION
Hand washing
Oral care
Elevate the head end of the bed 30 degrees
Patient turning
GI and DVT prophylaxis
Daily sedation holidays
Airway and ventilator management
Daily assessment on readiness to wean /
spontaneous breathing trial
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HAND WASHING
Single most important and easiest method of reducing the transmission of pathogens
Use of waterless antiseptics acceptable and increase compliance
• Beginning and end of workday
• Before and after patient
contact
• After touching contaminated
surfaces
• Encourage patient’s to ask!
?.....
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Health care worker button
Room poster
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ORAL CARE
Dental plaque contains multiple pathogens
which rapidly shift from non pathogenic
organisms to GNB and Staph
Micro aspiration of oral secretions from around
the cuff occurs in all ventilated patients.
Good oral hygeine
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WHY IS THERE NO CONSISTENCY IN ORAL
CARE?
Not given high priority
Anxiety on loosing the ETT
Optimal technique and frequency not determined
Best practice
Daily assessment of oral hygeine
Brushing or cleaning with swabs/ 12 hrs
Routine suctioning of mouth
Application of antibiotic solutions may cause
overgrowth of resistant bacteria
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HEAD UP TILT – 30 – 45 DEGREES
Supine position is an independent risk factor
for death in all ICU patients
Major benefit in preventing aspiration
CDC recommendation
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WHY ?
Help to reduced VAP
More comfortable
Easy to ventilate
Good for neurosurgical patients
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OVER SEDATION
Leads to
DVT
Pressure ulcers
GI regurgitation and aspiration
VAP and Sepsis
Because
Difficult to monitor neurological status
Increases ventilator days
Increased diagnostic procedure
Longer ICU stay
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SEDATION WEANING PROTOCOLS
Routine assessment of sedation levels
Setting sedation goals individualised for each patient
All infusions should be at the lowest rate required
IV bolus to supplement IV infusions when necessary eg physiotherapy, procedures
Every patient must be awakened daily unless contraindicated.
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HOW ?
Wean off infusion by 10 – 25% daily till patient
wakes
Rebolus and restart infusion if patient becomes
symptomatic
New infusion rate should be lower than the
previous set rate
Goal is to decrease sedation
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ENDOTRACHEAL INTUBATION
Causes mucosal injury and decreases mucociliary clearance
Decreases efficacy of cough
Increases mucus secretion
Provides resaviour for bacteria
Nasotracheal best avoided
Keep cuff pressure 25 – 30 cmH2O
Re intubation is a risk factor
Non invasive ventilation
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SUCTIONING
Should be done regularly
N saline should not be used routinely
Can cause desaturation
Potentially may dislodge bacteria
Yankuer
Change daily
Rinse with N saline or sterile water
Leave to air dry
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VENTILATOR CIRCUIT
Keep disconnection to the minimum
Leads to loss of PEEP and alveolar de-
recruitment
Expiratory condensation should be removed via
trap in the tubing
Humidify HME or Heated humidifiers
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GASTRIC ALKALINIZATION
H2 blockers and proton pump inhibitors
decrease the incidence of stress ulcers
But colonisation increases with alkalinization
These organisms may gain access to the Resp
tract
Sucralfate
Enteral feeding better
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ENTERAL FEEDING
Keep head end elevated
Verify NG tube placement routinely
No recommendations regarding continuous
versus bolus feeds
No recommendations regarding post pyloric
placements ( Naso jejunal)
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SUMMARY
High index of suspicion
Cultures before antibiotics
Appropriate broad spectrum in high doses
Rapid de-escalation based on cultures
Non invasive ventilation whenever possible
Preventive measures
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PREVENTION
Hand washing
Oral care
Elevate the head end of the bed 30 degrees
Patient turning
Early GI feeding and DVT prophylaxis
Daily sedation holidays
Airway and ventilator management
Daily assessment on readiness to wean /
spontaneous breathing trial
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