ventilator-associated events: the quest for objectivity presented by: matthew b. crist, md, mph
TRANSCRIPT
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Ventilator-Associated Events: The Quest for Objectivity
Presented by: Matthew B. Crist, MD, MPH
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Objectives
Review ventilator-associated event (VAE) definitions
Discuss tiers of VAE algorithm Demonstrate VAE surveillance methods Provide tips and tools for beginning VAE
surveillance
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Outline• Background • Definitions• VAE Algorithms• Ventilator-Associated Condition (VAC)
Determination of Event Date Establish Window Period
• Infectious VAC (IVAC) Fever and white blood cell count Antibiotic start
• Possible Ventilator-Associated Pneumonia (PVAP) Gram stains Culture results
• Denominator data• Cases
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Background Ventilator-associated pneumonia is an
important healthcare-associated infection with significant morbidity and mortality
However, there has not been a valid, reliable surveillance definition
NHSN pneumonia definitions are very subjective– Utility in monitoring within a facility– Not well suited for comparisons between
facilities
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Subjectivity of NHSN- PNU 1, 2, 3
Chest x-rays– Lack specificity– Interobserver variability
Clinical signs and symptoms– Lack sensitivity and specificity– Depend on documentation
Microbiological evidence– Lack sensitivity and specificity– Culturing practices vary by provider– Controversy regarding best practices
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A New Approach
Working group convened in 2011 to revamp VAP surveillance
Finalized and implemented into NHSN in January 2013– Based on work done by Michael Klompas and CDC
education centers (PLoS One 2011;6:e18062, Crit Care Med 2012; in press)
– Focus on objectivity, reliability, and more suitable for automated capture
– Includes more general measures of ventilator-associated conditions and complications
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VAE Working Group Members
American Association of Critical Care Nurses American Association for Respiratory Care American College of Chest Physicians Association for Professionals in Infection Control and
Epidemiology American Thoracic Society Council of State and Territorial Epidemiologists HICPAC Surveillance Working Group Infectious Disease Society of America Society of Critical Care Medicine Society for Healthcare Epidemiology of America US Department of Health and Human Services/Office of Disease
Prevention and Health Promotion National Institute of Health
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VAE Protocol VAE protocol went live in January 2013– VAP protocol also remained in-plan in 2013
In January 2014 VAE became the only in-plan option available for ventilated patients– VAP is now only available for in-plan
surveillance in pediatric locations– PNEU definitions are still available for off-
plan surveillance in adult ICUs
Required to be reported in SC since January 2015
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VAE Surveillance: Tiered Approach
Tiers 1 and 2– Objective Criteria: Suitable for potential public
reporting Ventilator Support Settings Fever: Temp>100.4 WBC ≥12 Antibiotic start
Tier 3– Better suited for internal monitoring– Incorporate microbiology criteria
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Comparison to Prior Definitions
Reasonable to expect that VAE rates will be higher than PNEU/VAP rates, using 2002 PNEU definitions
Cannot benchmark/compare with the “old” VAP Rates PNEU/VAP ≠ possible VAP + probable VAP
At least one year of data to establish a baseline period
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PVAP in 2015
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Who is eligible? Inpatients of:– Acute care hospitals– Long term acute care (LTAC) hospitals– Inpatient rehabilitation facilities (IRFs)
Patients receiving mechanical ventilation Patients in adult locations– Includes patients <18 years old in adult
locations
* Not recommended that young children in adult locations who are not thought to be physiologically similar to the location’s adult patient population be included in VAE surveillance
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Who is not eligible?
Patients who have been ventilated for <3 days
Patients on high frequency ventilation or extracorpeal life support (during the time they are receiving those therapies)
Patients in locations other than NHSN adult locations– Adult patients in pediatric locations are
included in PED-VAP surveillance
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Ventilator
Device to assist or control respiration continuously, inclusive of the weaning period, through a tracheostomy or endotracheal tube
Respiratory support not considered mechanical ventilation unless delivered via tracheostomy or endotracheal tube:– Intermittent positive-pressure breathing (IPPB)– Nasal positive end-expiratory pressure (nasal PEEP)– Continuous nasal positive airway pressure (CPAP)
No change from previous definition
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Modes of Ventilation
Excluded from VAE surveillance– High frequency ventilation– Extracorporeal life support
Included in VAE surveillance– Prone position– Nitric oxide or epoprostenol therapy– Airway Pressure Release Ventilation (APRV)
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Episode of Mechanical Ventilation
A period of days during which the patient was mechanically ventilated for some portion of each consecutive day.
A break in mechanical ventilation of at least one full calendar day followed by reintubation and reinitiation of mechanical ventilation is a new episode.
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Tier 1: VAC
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Positive End Expiratory Pressure (PEEP)
Pressure at the end of exhalation that is above atmospheric pressure
PEEP decreases the work of breathing and improves oxygenation
An increase in PEEP provides more ventilator support for the patient
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Fraction of Inspired Oxygen (FiO2)
Fraction of oxygen in inspired gas
FiO2 of ambient air is 0.21
FiO2 can be increased on the ventilator to better oxygenate the patient
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Daily Minimum FiO2 and PEEP
Choose the lowest FiO2 and PEEP settings during the calendar day that were maintained for at least 1 hour
Daily minimum PEEP values of 0-5 cmH2O are considered equivalent (=5) for the purpose of VAE surveillance
Include values recorded during spontaneous breathing trials or other forms or weaning
Do not include periods of time when: – the patient is on an excluded mode of ventilation– the patient is not on mechanical ventilation (T-
piece trial or trach collar trial)
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Daily minimum FiO2 and PEEPChange for 2015
When there is no PEEP or FiO2 setting documented to have been maintained for at least 1 hour during a calendar day – ventilation initiated late in the day– ventilation discontinued early in the day– Ventilator settings changed frequently so no
setting is maintained for > 1 hour
The lowest setting for the calendar day will be utilized, regardless of the duration of time the setting was maintained
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Airway Pressure Release Ventilation
Included in VAE surveillance VAC determined by changes in FIO2 only Changes in PEEP in the algorithm may not be
applicable to APRV Leave PEEP blank in VAE calculator (do not enter 0)
If patient is on APRV part of the day and a conventional mode for part of the day the PEEP values while on the conventional mode can be used to determine a minimal PEEP for VAC determination
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Period of Stability or Improvement
Defined as ≥2 calendar days of stable or decreasing daily minimum FiO2 or PEEP values
The baseline period is defined as the 2 calendar days immediately preceding the first day of increased daily minimum PEEP or FiO2
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Evidence of Worsening Oxygenation
After the period of stability or improvement on the ventilator, the patient has at least one of the following indicators of worsening oxygenation:
– Increase in daily minimum PEEP of ≥3 cmH2O, over the daily minimum PEEP in the baseline period, sustained for ≥2 calendar days
or– Increase in daily minimum FiO2 of ≥0.20, over
the daily minimum FiO2 in the baseline period, sustained for ≥2 calendar days
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Date of Event
The date of onset of worsening oxygenation
Day 1 of the ≥ 2 day period of worsening oxygenation
Not the date on which all VAE criteria are met
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VAE Window Period This is the period of days around the event date
(i.e., the day of onset of worsening oxygenation) within which other VAE criteria must be met
Usually 5-day period:– The 2 days before the VAE event date– The event date– The 2 days after the event date
Does not include ventilator days 1 and 2 Will be < 5 days if event date is on mechanical
ventilation day 3 or 4
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VAE Window Period
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When is the VAE window period <5 days?
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VAE Surveillance: Table
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VAE Surveillance: Determine Event Date
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Determine Event Date
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Determine Event Date
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VAE Surveillance: Determine Event Date
VAE Event Date
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Establish the VAE Window Period
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Next Step
At this point VAC definition has been met
Thus we now proceed to Tier 2 and determine if IVAC definition is met
If the criteria for VAC is not met, you do not need to proceed further
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Tier 2: IVAC
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Temperature or WBC Criteria
As long as the abnormal temperature or WBC is documented to have occurred during the window period the criteria is met
Does not matter if it was present prior to the window period
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Temperature or WBC Criteria
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New Antimicrobial Agent
Any agent listed in the protocol Appendix that is initiated in the VAE Window Period
Considered new if NOT given in the 2 days preceding the current start date
Must be continued for ≥ 4 consecutive days
Must be administered IV, IM, via digestive tract, or via respiratory tract
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New Antimicrobial Agent
No requirement that the same antimicrobial agent be given on the 4 consecutive days
However, if antibiotic is changed after the window period, it does not count as a new agent or contribute to the 4 consecutive days
Days between administrations of a new antimicrobial agent count if there is a gap of no more than 1 calendar day between administrations of the same drug
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Qualifying Antimicrobial Days (QADs)
Vs
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New Antibiotic Start
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Next Step Patient now meets the IVAC definition Thus proceed to evaluation for PVAP PVAP definition will utilize the same elements
included in the previous Possible and Probable VAP definitions – purulent respiratory secretions– positive cultures– other laboratory diagnostic test results
Simplify the VAE definition algorithm Will be consistent with how VAE data will be
analyzed
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Tier 3: PVAP in 2015
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Criterion #1
Positive lower respiratory tract cultures – Endotracheal aspirate ≥105 CFU/ml or equivalent
semi-quantitative result– Bronchoalveolar lavage ≥104 CFU/ml or equivalent
semi-quantitative result– Protected specimen brushing ≥103 CFU/ml or
equivalent semi-quantitative result– Lung tissue ≥104 CFU/g or equivalent semi-
quantitative result
* Does not require purulent respiratory secretions
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Criterion #2 Purulent respiratory secretions– Secretions from the lungs, bronchi, or trachea – ≥25 neutrophils (polys, PMNs) per low power field– ≤10 squamous epithelial cells per low power field
AND Positive lower respiratory tract cultures (qualitative or
quant/semi-quant culture without sufficient growth to meet Criterion #1)– Sputum– Endotracheal aspirate– Bronchoalveolar lavage– Protected specimen brushing– Lung tissue
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Semi-Quantitative Gram stains Ask your laboratory manager/director first If your lab does not have this information, use the following:
– 1+ = occasional or rare = <1 cell per lpf, x100)– 2+ = few = 1-9 cells per lpf, x100– 3+ = moderate = 10-25 cells per lpf, x100– 4+ = heavy = >25 cells per lpf, x100
Thus, without information from your lab, “purulent respiratory secretions” are defined by:– ≥25 neutrophils per lpf, x100 = “heavy” or 4+
AND – ≤10 squamous epithelial cells per lpf, x100 = “rare”,
“occasional”, “few”, 1+ or 2+
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Criterion #3
One of the following positive tests:– Pleural fluid culture– Lung histopathology– Diagnostic tests for Legionella – Diagnostic tests for select respiratory virus
infections
Does not require purulent respiratory secretions
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Non-Culture Based Tests
Positive diagnostic test for Legionella Positive diagnostic test for respiratory viruses
– Influenza– Parainfluenza– RSV– Human metapneumovirus– Adenovirus– Rhinovirus– Coronavirus
Other pathogens that may be detected with non-culture-based techniques are not currently included in probable VAP criteria
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Respiratory Tract Colonizers
Exclude the following as a pathogen unless isolated from lung tissue (Criterion #1 or #2) or pleural fluid (Criterion #3) : Candida species or yeast not otherwise specified Coagulase negative Staphylococcus species Enterococcus species
Exclude the following culture results (or similar): Normal respiratory flora / Normal oral flora Mixed respiratory flora / Mixed oral flora Altered oral / respiratory flora
More likely to be colonizers of the respiratory tract than pathogens
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Community-Associated Fungal Pathogens
Beginning in 2015 the below are excluded from meeting any laboratory criteria for VAE surveillance including pleural and lung tissue cultures: – Cryptococcus– Histoplasma– Coccidiodes– Paracoccidioides– Blastomyces– Pneumocyctis
Typically acquired from the environment Rarely reported to be healthcare-associated
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PVAP
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Tiered Approach
1. For most patients only need to record daily minimum PEEP and FiO2 while on ventilator
2. Only need to assess temperature and white blood cell count for patients who fulfill VAC criteria and only for VAE Window Period
3. Only need to look at antimicrobial administrations for patients with VAC who meet temp or WBC criteria
4. Only need lab/microbiology/pathology data for patients with IVAC and only during the VAE Window Period
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Can the same patient have multiple VAEs?
Each VAE is 14 days in duration
Day 1 is the Event Date—so if June 1 is date of onset of a second VAE cannot be detected until June 15
Period is event date to event date—so baseline period can occur during previous event period
May not “upgrade” a VAE based on data collected outside the VAE Window Period but in the 14-day event period
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Pathogen Reporting
Pathogens reported for PVAP, according to usual pathogen and antimicrobial susceptibility reporting methods utilized in NHSN for other events
Pathogens NOT reported for VAC or for IVAC
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Secondary Bloodstream Infections Secondary BSI may be reported for PVAP
– At least one organism from the blood culture matches an organism from an appropriate respiratory tract specimen collected during the VAE Window Period
– The blood culture was collected within the 14 day event period
Secondary BSI may NOT be reported for PVAP if no respiratory culture performed
Secondary BSIs NOT reported for VAC or IVAC
BSI cannot be attributed to VAC or IVAC or a PVAP without a matching culture
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Can a BSI still be attributed to a PNEU or LRI?
If a BSI is not secondary to a PVAP (there is no matching culture) then it could still be secondary to any other HAI defined in Chapter 17 of the NHSN Protocol including PNEU or LRI
This was recently changed to avoid penalizing facilities performing VAE surveillance
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Location of Attribution
Defined as the inpatient location where the patient was assigned on the VAE event date (the date of onset of worsening oxygenation)
Transfer Rule: If VAE develops on the day of transfer or the day following transfer from one inpatient location to another, the VAE is attributed to the transferring location
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Denominator Data
Device (ventilator) days and patient days In 2015 Episodes of Mechanical Ventilation
added as an optional denominator
Collect data at the same time each day
Daily counts are summed and only the total for the month is reported in NHSN
Ventilator days – number of patients in location who are managed with a ventilatory device
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Denominator Data
Ventilator days for all patients are counted including:– Ventilator < 3 days– Those receiving excluded therapies– Pediatric patients housed in adult locations
Number of patients on APRV mode of ventilation or related modes included in total and also indicated separately
Patient days = number of patients in chosen location
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Changes in 2015
1. Possible and Probable VAP combined into PVAP
2. Selected fungal pathogens will not be eligible for use in meeting the PVAP definition
3. When no PEEP or FiO2setting is documented to have been maintained for ≥1 hour during a calendar day the lowest setting for the calendar day will be utilized
4. Episodes of Mechanical Ventilation (EMV) will be introduced as an optional denominator
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Take-Home Points Patient must be ventilated >2 calendar days Earliest VAE event date is day 3 of mechanical
ventilation Patient must have ≥2 calendar days of stability or
improvement followed by ≥2 calendar days of worsening oxygenation
Date of Event is the 1st day of worsening oxygenation VAE Window Period:
– 2 days before, the day of, and 2 days after the VAE Event Date – Does not include mechanical ventilation days 1 and 2
All criteria must be identified in the VAE Window Period
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VAE Tools
CDC resourceshttp://www.cdc.gov/nhsn/acute-care-hospital/vae/index.htmlhttp://www.cdc.gov/nhsn/inpatient-rehab/vae/index.htmlhttp://www.cdc.gov/nhsn/ltach/vae/index.html
VAE calculator http://www.cdc.gov/nhsn/VAE-calculator/index.html
Tennessee checklistshttp://health.state.tn.us/ceds/hai/
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Acknowledgements
Cindy Gross, CDC DHQP Shelley MaGill, CDC DHQP VAE Working Group CDC Prevention Epicenters Other Subject Matter Experts
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Questions?
Matthew B. Crist, MD, MPHMedical ConsultantSouth Carolina Department of Health and
Environmental ControlDivision of Acute Disease Epidemiology2100 Bull St. Columbia, SC 22901803-898-2110 (p)[email protected]
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VAE Cases
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Baseline Period: Is this a VAC?
Mech Vent Day Daily Min PEEP Daily Min FIO2
1 10 35
2 10 30
3 8 30
4 8 70
5 8 70
6 8 60
VAC
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Baseline Period: Is this a VAC?
Mech Vent Day Daily Min PEEP Daily Min FIO2
1 10 30
2 10 30
3 8 35
4 8 70
5 8 70
6 8 60
No VAC
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Baseline Period: Is this a VAC?Mech Vent Day Daily Min PEEP Daily Min FIO2
1 10 100
2 7 60
3 5 50
4 8 50
5 8 50
6 8 50
No VAC
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Baseline Period: Is this a VAC?
Mech Vent Day Daily Min PEEP Daily Min FIO2
1 10 100
2 5 60
3 5 50
4 8 50
5 7 50
6 8 50
No VAC
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Baseline Period: Is this a VAC?
Mech Vent Day Daily Min PEEP Daily Min FIO2
1 10 100
2 5 60
3 5 50
4 10 50
5 8 50
6 8 50
VAC
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Case 1: 56 yo female admitted w/pneumonia. Tests positive for Influenza A. On day 3 requires mechanical ventilation.
Does patient meet criteria for VAC?Hosp Day
Mech Vent Day
Daily Min PEEP
Daily Min FIO2
Temp WBC Abx Abx Abx
1 37.2 16.7 ceftriaxone
2 37.4 16.2 ceftriaxone
3 1 5 75 36.9 12.9 ceftriaxone vanc
4 2 5 60 37.4 12.3 vanc
5 3 10 60 37.1 14.9
6 4 10 80 37.5 14.3 vanc Cefepime
7 5 8 80 39.4 12.8 vanc Cefepime
8 6 8 65 39.0 11.4 Cefepime
9 7 5 80 37.6 10.3 Cefepime
10 8 5 60 37.4 9.1 Cefepime
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Case 1: Does patient meet criteria for IVAC?
Hosp Day
Mech Vent Day
Daily Min PEEP
Daily Min FIO2
Temp WBC Abx Abx Abx
1 38.2 16.7 ceftriaxone
2 37.4 16.2 ceftriaxone
3 1 5 75 36.9 12.9 ceftriaxone vanc
4 2 5 60 37.4 12.3 vanc
5 3 10 60 37.1 14.9
6 4 10 80 37.5 14.3 vanc Cefepime
7 5 8 80 39.4 12.8 vanc Cefepime
8 6 8 65 39.0 11.4 Cefepime
9 7 5 80 37.6 10.3 Cefepime
10 8 5 60 37.4 9.1 Cefepime
IVAC
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Case 1: Does patient meet criteria for PVAP? Hosp Day
Mech Vent Day
Daily Min PEEP
Daily Min FIO2
Temp WBC Abx Spec Polys/Epis
Culture
1 37.2 16.7
2 37.4 16.2
3 1 5 75 36.9 12.9
4 2 5 60 37.4 12.3
5 3 10 60 37.1 14.9
6 4 10 80 37.5 14.3 Cefepime
7 5 8 80 39.4 12.8 Cefepime BAL >25/<10 Pseudomonas
8 6 8 65 39.0 11.4 Cefepime
9 7 5 80 37.6 10.3 Cefepime blood Pseudomonas
10 8 5 60 37.4 9.1 Cefepime
PVAP
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Case 1: Does patient have a secondary BSI?Hosp Day
Mech Vent Day
Daily Min PEEP
Daily Min FIO2
Temp WBC Abx Spec Polys/Epis
Culture
1 37.2 16.7
2 37.4 16.2
3 1 5 75 36.9 12.9
4 2 5 60 37.4 12.3
5 3 10 60 37.1 14.9
6 4 10 80 37.5 14.3 Cefepime
7 5 8 80 39.4 12.8 Cefepime BAL >25/<10 Pseudomonas
8 6 8 65 39.0 11.4 Cefepime
9 7 5 80 37.6 10.3 Cefepime blood Pseudomonas
10 8 5 60 37.4 9.1 Cefepime
Sec BSI
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Case 1 Summary
VAC– Doesn’t matter that patient admitted with a
community-acquired pneumonia– Stability over MV days 1 & 2 with increase
in PEEP ≥ 3cm H20 over baseline MV days 3 & 4
– VAE event date MV day 3– VAE Window Period MV days 3-5: do not
include MV days 1 & 2 in Window Period
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Case 1 Summary
IVAC– WBC ≥ 12,000 cells/mm3 within Window Period– Temp, WBC, and other lab criteria can be present prior to
Window Period as long as criteria is met during the Window Period
– Cefepime is started during the Window Period and continued for 4 consecutive days
PVAP– Purulent secretions and positive BAL culture within Window
Period- Criterion 2– Secondary BSI: Positive blood culture with same organism
during 14 day event period
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Case 2
74 yo male intubated s/p cardiac bypass surgery
Extubated on MV day 3 Reintubated MV day 4 Spikes a fever and endotracheal aspirate is
sent for culture on MV day 5
Does this patient have a VAE? If so what type?
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Case 2Mech Vent Day
Daily Min PEEP
Daily Min FIO2
Temp WBC Abx Spec Polys/Epis
Culture
1 6 50 37.2 5.8 Cefazolin
2 6 40 37.4 6.4
3 extub
6 40 36.9 6.7
4 reint 6 60 37.5 9.9
5 6 60 38.6 10.8 ETA >25/<10
Klebsiella pneumoniae
6 6 60 38.4 10.6
7 6 60 37.9 9.5 imipenem
8 5 50 37.4 7.8 imipenem
9 5 50 37.6 8.1 imipenem
10 5 40 37.4 7.2 imipenemVAC
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Case 2 Summary
VAC– One episode of MV as despite extubation, as patient on MV
for some portion of each day– Period of stability is day before and day of extubation (MV
days 2 & 3)– Event Date is the Day of reintubation (MV day 4) as there is
an increase in FIO2 ≥ 20% for ≥ 2 days– Window Period is MV days 3-6
No IVAC– Fever of 38.6o in Window Period– However, no antibiotic is started in the Window Period– Since there is no IVAC, do not pursue PVAP
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Case 2: What if antibiotic course looked like this?Mech Vent Day
Daily Min PEEP
Daily Min FIO2
Temp WBC Abx Spec Polys/Epis
Culture
1 6 50 37.2 5.8 vanc
2 6 40 37.4 6.4
3 6 40 36.9 6.7 vanc
4 6 60 37.5 9.9
5 6 60 38.6 10.8 Vanc & pip/tazo
ETA >25/<10
Klebsiella pneumoniae
6 6 60 38.4 10.6 pip/tazo
7 6 60 37.9 9.5 imipenem
8 5 50 37.4 7.8 imipenem
9 5 50 37.6 8.1 imipenem
10 5 40 37.4 7.2 imipenem
VAC
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Case 2: What if antibiotic course looked like this?Mech Vent Day
Daily Min PEEP
Daily Min FIO2
Temp WBC Abx Spec Polys/Epis
Culture
1 6 50 37.2 5.8 vanc
2 6 40 37.4 6.4
3 6 40 36.9 6.7 vanc
4 6 60 37.5 9.9
5 6 60 38.6 10.8 Vanc & pip/tazo
ETA >25/<10
Klebsiella pneumoniae
6 6 60 38.4 10.6 imipenem
7 6 60 37.9 9.5 imipenem
8 5 50 37.4 7.8 imipenem
9 5 50 37.6 8.1 imipenem
10 5 40 37.4 7.2 imipenem
IVAC
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Case 3
64 yo female with severe COPD exacerbation requiring intubation
Difficulty weaning off vent On MV day 7 patient has respiratory
decompensation On MV day 8 ETA collected showed many
neutrophils and rare epithelial cells On MV day 9 a trans-bronchial biopsy is
performed which grows Candida albicans ≥ 104 cfu/g
Does this patient have a VAE? If so what type?
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Case 3Mech Vent Day
Daily Min PEEP
Daily Min FIO2
Temp Abx Spec Polys/Epis
Culture
1 8 40 37.3 azithro
2 6 40 37.2 azithro
3 4 30 36.9 azithro
4 4 30 37.5 azithro
5 4 30 37.2 azithro
6 4 35 37.0 azithro
7 8 60 39.9 vanc & pip/tazo
8 8 60 39.1 vanc & pip/tazo ETA many/rare
9 8 60 39.3 vanc & pip/tazo TBBx C. albicans ≥104
10 8 50 38.8 V, P/T + micafung
11 8 40 38.0 V, P/T + micafung
12 6 40 37.4 V, P/T + micafungPVAP
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CASE 3 Summary VAC– Stability of PEEP for MV days 5 & 6 followed
by increase ≥ 3 cm H20 for MV day 7 & 8 (Evaluate PEEP & FIO2 separately)
– Event Date MV day 7 and Window Period MV days 5-9
IVAC– Fever 39.9o in Window Period– Vanc & pip/tazo started in Window Period
and continued for 4 consecutive days
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CASE 3 Summary
PVAP – C. albicans ≥104 CFUs grew from
transbronchial biopsy collected during Window Period
– Although C. albicans is an excluded organism it is considered a pathogen when isolated from lung tissue or pleural fluid