ventilator associated events (vae): can they be prevented? · ventilator associated events (vae):...
TRANSCRIPT
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Ventilator Associated Events (VAE):Can They Be Prevented?
John J. Gallagher, DNP, RN, CCNS, CCRN, RRTProgram Manager/Clinical Nurse Specialist
Division of Trauma, Surgical Critical Care & Emergency SurgeryPenn Presbyterian Medical Center
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Objectives
• Define Ventilator Associated Events (VAEs) and their clinical significance
• Describe potential strategies for prevention of VAEs through the critical care continuum
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The Complexity of Critical Illness
Photo by John Gallagher
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What is it that we do?
Create safe passage for our patients through the healthcare experience
• Treating the patient for the immediate problems
• Protecting them from complications of injury/illness and the associated treatments
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What are Ventilator Associated Events (VAE)?
CDC Surveillance Definitions (2017)
Magill, SS et al. (2013) Developing and new, national approach to surveillance for ventilator-associated events. Chest 144(5): 1448-1452.
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Causes of VAE
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Interventions to Reduce VAE
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Interventions to Prevent Intubation
• High Flow Nasal Cannula (HFNC)• Use of non-invasive positive
pressure ventilation (NIPPV)• Fluid Management
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High Flow Nasal Cannula (HFNC)
• 40 to 60 liters per minute • FiO2 100% (titrate to requirement)
• No limit to length of use
Indications• Acute Hypoxemic RF/Respiratory
distress• Oxygenation during procedures• Post-extubation support• Prevention of Intubation/DNR• Palliative support
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High Flow Nasal Cannula (HFNC)
• Flushes CO2 of physiologic deadspace (150 mls)• Oro-pharynx• Large airways
• Meets Higher Minute Ventilation Demands• Improves V/Q matching
• Nasal CPAP• Prevents small airway closure• Prevents alveolar collapse
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High Flow Nasal Cannula (HFNC)
• 310 patients with hypoxemic respiratory failure• Standard Oxygen therapy• HFNC• NIPPV
• Intubation rates did not differ significantly among the three groups but trended lower in the high-flow–oxygen group
• This group also had a significantly lower mortality at 90 days, more ventilator-free days, and less respiratory discomfort
Frat J-P et al. N Engl J Med 2015 Jun 4.
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Non-invasive Positive Pressure Ventilation
Avoidance of Intubation
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Non-invasive Positive Pressure Ventilation
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Patient Selection
Level B : Evidence from well designed controlled studies, both randomized and nonrandomized, with results that consistently support a specific action, intervention or treatment.
• OSA• Cardiogenic Pulmonary Edema• Acute on chronic respiratory failure (i.e., chronic obstructive pulmonary
disease)
Level C : Evidence from qualitative research, observational studies or controlled trials with inconsistent results
• Immunosuppressed patients with pneumonia • Acute hypoxemic respiratory failure.
Level D: Evidence from peer reviewed professional organization standards, or integrative reviews, no clinical studies to support recommendations
• To prevent re-intubation following extubation.
Level E: Evidence, theory based, from expert opinion or multiple case reports• Failure to wean. • Invasive ventilation not desired; palliative or end-of-life care
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NIPPV for Prevention of Complications
• Lower risk of pneumonia • Decrease duration of MV• Decrease ICU and Hospital LOS• Death
Hess, D. R. (2005) Resp Care, 50(7)Burns et al. (2013) Cochrane Review
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Contraindications
• Inability to protect the airway • Inability to manage secretions (aspiration risk)• Hemodynamic instability• Agitation• Claustrophobia (relative)• Worsening acidosis
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Interventions During Ventilation
• Airway/Oral Care• Head of Bed Elevation• Low Tidal Volume Ventilation (LTVV) • Fluid Management• Minimizing Sedation• Exercise/Mobilization
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Airway Management and Oral Care
Prevention of Aspiration
Airway Technology
Oral Care
Airway Maintenance
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Airway Technology
Fernandez JF, Levine SM, and Restrepo MI. Chest 142.1 (2012): 231-8.
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Altering Cuff Shape Allows for Better Sealing Characteristics
Proximal cuff:Cuff diameter > Tracheal diameter
Sealing band (mid cuff):Cuff diameter = Tracheal diameter eliminating excess cuff material locally
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Influence of an endotracheal tube with polyurethane cuff and subglottic secretion drainage on Pneumonia
• 24 bed Medical Surgical ICU• 280 intubated patients
• 140 Conventional ETT (ETT-C)• 140 Polyurethane cuff with sub-glottic secretion drainage
(PUC-SSD)
• Results• ETT-C VAP Rate: 22.1% (31/140) • PUC-SSD VAP Rate: 7.9% (11/140)
• Conclusion• PUC-SSD endotracheal tube helps to prevent both early and
late VAP
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Removal of Subglottic Secretions
• Aspiration of pooled secretions above the endotracheal cuff
• Research • Mixed results in preventing VAP• Statistically significant delay in onset of VAP• No mortality improvement
Scherzer R. Dimens Crit Care Nurs. 2010;29(6):276-280. Lacherade JC et al. Am J Respir Crit Care Med. 2010;182(7):910-917. Lorente L et al. Am J Respir Crit Care Med. 2010;182(7):870-6. Damas P, et al. Critical Care Medicine 43.1 (2015) Frost SA, et al. Australian Critical Care 26.4 (2013): 180-8.
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Cuff Pressure and ETT Repositioning
• Cuff Pressure Maintain between 20 to 30 cmH2O• Minimal Occlusive Volume (MOV)• Minimal Leak Technique (MLT)
• Suction the oral cavity/above the cuff• Every 2-4 hours• Before repositioning the ETT• Before manipulating the cuff pressure• Before extubation
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Oral Hygiene
• Prevention or modification of oropharyngeal decontamination
• Mechanical cleansing of teeth/mucosa
• Application of local antibacterial agents• 1.5% peroxide• Chlorhexidine (0.12%)• Topical antibiotics
Labeau, S. O., et al. The Lancet Infectious Diseases 11.11 (2011): 845-54. Klompas M, et al JAMA Internal Medicine 174.5 (2014): 751-61. Hillier B, et al. AACN Advanced Critical Care 24.1 (2013): 38-58.
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Chlorhexidine
• Topical Chlorhexidine is beneficial in preventing or delaying the onset of VAP (concentration range: 0.12, 0.2, 2%)
• Most compelling evidence in cardiac surgery population
• Reduction in other populations also noted at 2% concentration
• Optimal frequency of application to be determined
• No impact on mortality
•Chlebicki, MP (2007) Critical Care Medicine; 35(2): 595-602•Grap, MJ (2004) Heart and Lung; 33(2)83-91 25
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Head of Bed Elevation/Reverse Trendelenberg
• Supine position identified as an independent risk factor for for VAP• Three (3) trials of 337 patients
• 1 found significant benefit
• Easy, Low cost and Low risk
Aspiration Prevention
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Low Tidal Volume Ventilation (LTVV)
• ARDSNET Trial 2000• Lower mortality rate with 6 ml/Kg IBW (vs. 12 ml/Kg)
in ARDS
• Protective impact now extended to those without ARDS• Each ml above 6 ml/Kg PBW increases VAE odds 21%
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Mechanical Ventilation
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Mechanical Ventilation–associated Lung Fibrosis in Acute Respiratory Distress Syndrome:A Significant Contributor to Poor OutcomeAnesthes. 2014;121(1): 189-198.
Ventilator Induced Lung Injury
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Lung Protective Principles
• Maintain safe transalveolar pressures• Plateau pressure < 30 cm H20
• Prevent end-tidal alveolar collapse• PEEP
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Improving Oxygenation
• Manipulation of FiO2
• Manipulation of Mean Airway Pressure (Paw)
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Mean Airway Pressure ( Paw )
Adapted from Pilbeam, 2006
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Increase Mean Airway Pressure
• PEEP• Square Waveform• I:E Ratio Manipulation
• Inverse Ratio Ventilation (IRV)• Recruitment maneuver
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APRV Characteristics• High CPAP level with a short expiratory releases at set intervals
(rate).
• APRV always implies an inverse I:E ratio
• All spontaneous breathing is done at upper pressure level
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Alveolar Volumetric Changes
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Volume Overload
• Volume overload increases interstitial edema worsening gas exchange
• Positive fluid balance associated with increase in VAEs and mortality• ARDS• Sepsis• Pneumonia
• Compounded by PPV/PEEP/ARDs
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Conservative Fluid Management/Endpoints
• Static Parameters• Measure a point in time• CVP, PCOP, LVEDV
• Dynamic Parameters (Functional)• Measure a functional change in stroke volume or
surrogate (PPV, SVV, SPV)• Echo• May require a “challenge”
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Volume Challenge Process
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Conservative Blood Transfusion Threshold
• Associated risks for VAE related to volume overload (TACO) or inflammatory response trigger• TRALI• ARDS• Sepsis• Pneumonia
• Reserved for clear indication of component therapy
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Interventions to Promote Ventilator Liberation
• Spontaneous Awake Trial (SAT)• Spontaneous Breathing Trial (SBT)• Mobilization• Fluid Management
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ABCDEF Bundle
• Assess, Prevent and Manage Pain
• Both SAT and SBT
• Choice of Analgesia and Sedation
• Delirium: Assess, Prevent and Manage
• Early Mobility and Exercise
• Family Engagement and Empowerment
• Goals of Carehttp://www.iculiberation.org
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Girard TD, et al. Lancet 371.9607 (2008): 126-34.
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Early Mobility and Exercise
Bailey P, et al. Critical Care Medicine 35.1 (2007): 139-45. Schweickert WD, et al Lancet 373.9678 (2009): 1874-82 Balas MC, et al. Critical Care Medicine 42.5 (2014): 1024-36.
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Benefits of Early Mobility
• Preserves musculoskeletal and neuromuscular integrity
• Enhances cardiovascular function• Enhances endothelial function• Decreases chronic inflammation• Regulates hormone levels• Improves blood sugar homeostasis• Decreases depression and improves cognition
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Equipment Helps
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Family Engagement / Goals of Care
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Summary: VAE Prevention Strategies
• Avoid mechanical ventilation through the use of non-invasive Positive Pressure Ventilation and HF Nasal Cannula
• Prevent complications during mechanical ventilation by using LTVV, elevating the HOB, providing oral care and giving fluids and transfusions conservatively
• Limit the duration of mechanical ventilation by minimizing Sedation, perform daily SAT and SBT, and implementing Early Exercise and Mobility programs
• Engage family
• Goals of Care
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Caring for the critically-ill patient is both art and science
It requires mastery of assessment skills and the ability to understand both the benefits as well as limitation
technology in monitoring and treatment of our patients