nebulizers for mechanically ventilated patients: useful or...
TRANSCRIPT
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Nebulizers for mechanically
ventilated patients:
useful or useless
2019. 04. 27
서울의대호흡기내과
이상민
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What is current status of aerolized therapy in ICU?
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Administering Aerosols
Meter Dose Inhaler
(MDIs)NebulizersVS
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Types of Nebulizer
From A Guide To Aerosol Delivery Devices for Respiratory Therapists, 4th Ed
Jet Ultrasonic
Vibrating Mesh
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Aerosol Devices Used in Critical Care
RESPIR CARE 2015;60:858
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Aerosol Delivery in SB vs MV Patient
RESPIR CARE 2017;62:1343
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Effect of Aerosol Size on Deposition Site
From A Guide To Aerosol Delivery Devices for Respiratory Therapists, 4th Ed
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Mechanisms of Particle Deposition
Crit Care 2016;20:269
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Aerosol Deposition in Intubated Patient
Crit Care 2017;21;264
Imaging deposition studies revealed that the trachea and large bronchi represent the
major site of drug deposition.
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• Drug-related factors
Particle size
Molecular weight
• Device factors
• Patient-related factors
Airway anatomy
Inhalation patterns
• Mechanical ventilation-related factors
Humidification
Airway
Factors on Aerosol Drug Efficacy
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Factors that Influence Aerosol Delivery
Eur Resp J 1996;9;585
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Factors for Aerosol Delivery in ICU
Crit Care 2016;20:269
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Aerosol Delivery at Different Insp Flows
RESPIR CARE 2004 ;49:611
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How to Improve Drug Deposition during MV
J Bras Pneumol. 2015;41(5):467
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• Two-week cross-sectional study in 81 ICU of 22 countries.
• A total of 9714 aerosols were administered to 678 of the 2808 admitted
patients (24 %).
• Among intubated patients, 22 % received aerosols.
• Bronchodilators & corticosteroids were the most frequently delivered drugs
(88 % overall).
• Only 106 (<1 %) mild side effects were observed.
Intensive Care Med 2016;42:192
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How about bronchodilator using nebulizer in ICU?
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1. Severe asthma
2. COPD
3. Acute bronchospasm or wheezing
4. Elevated airway resistance
5. Dynamic hyperinflation/intrinsic PEEP
6. Difficulty in weaning
Indications for Bronchodilator in MV
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Effect of Albuterol in COPD with MV
J Aerosol Med Pulm Drug Deliv 2012;25:319
Maximal inspiratory resistance (Rrs max)
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Airway Response of Bronchodilator in MV
J Aerosol Med Pulm Drug Deliv 2012;25:319
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• Both nebulizers and MDIs can be used to deliver beta2-agonists to
ventilated patients.
• Cannot use DPI during mechanical ventilation.
• Careful attention to the details of technique is critical, since multiple
technical factors may have clinically important effects on the efficiency
of aerosol delivery.
Chest 2005; 127:335
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Cochrane Database of Systematic Reviews 2013, Issue 6. Art. No.: CD008863.
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• To determine if a strategy that uses nebulization for clinical indication
(on-demand) is noninferior to one that uses preventive (routine)
nebulization.
• Adult patients expected to need invasive ventilation for more than 24
hours at 7 ICUs in the Netherlands.
• On-demand nebulization of acetylcysteine or salbutamol (based on strict
clinical indications, n = 471) or routine nebulization of acetylcysteine with
salbutamol (every 6 hours until end of invasive ventilation, n = 473).
JAMA. 2018;319(10):993
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JAMA. 2018;319(10):993
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• Administration of either aerosolized β-adrenergic or anticholinergic drugs
produces significant bronchodilator responses in ventilated patients.
• However, widespread use of β-agonists in mechanically ventilated
patients who do not have clear indications for their use, especially in
high doses, have not been shown to lead to improvement in clinical
outcomes and have the potential to be harmful.
• Thus, frequent and high doses of nebulized β-agonists should be
avoided in mechanically ventilated patients unless there are specific
indications for their use.
Aerosolized Bronchodilator in MV
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• Administration of high doses of β-agonists causes tachycardia, and has
the potential to cause atrial and ventricular arrhythmias.
• High risk patients
elderly patients
preexisting heart disease
atrial fibrillation
prior history of ventricular tachycardia
Side Effects of Aerosolized Bronchodilator
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How about antibiotics using nebulizer in ICU?
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1. Aerosolized antibiotics reach the infected lung parenchyma without
crossing the pulmonary alveolar capillary barrier
2. Aerosolized antibiotics increase anti-bacterial efficacy through increased
local antibiotic concentration
3. Aerosolized antibiotics decrease systemic toxicity
Rationale for Aerosolized Antibiotics
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Pathogenesis of VAT/VAP
Curr Opin Crit Care 2014, 20:532
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Pathogenesis of VAT/VAP
Clin Chest Med 2011;32:559
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Rationale for Treating VAT
Clin Chest Med 2011;32:559
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Aerosolized Antibiotics in Literature
Clin Chest Med 2011;32:559
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Microbiological Response to AA
Clin Chest Med 2011;32:559
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Clinical Trials about Aerolized Antibiotics
RESP CARE 2016 ;61:737
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• Treatment of Ventilator-Associated Tracheobronchitis
• VIII. Should Patients With Ventilator-Associated Tracheobronchitis (VAT) Receive Antibiotic Therapy?
• Recommendation
1. In patients with VAT, we suggest not providing antibiotic therapy (weak recommendation, low-quality evidence).
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• XIX. Which Antibiotic Should Be Used to Treat Patients With HAP/VAP Due to Acinetobacter Species?
• Recommendations
1. In patients with HAP/VAP caused by Acinetobacter species, we suggest treatment with either a carbapenem or ampicillin/sulbactam if if the isolate is susceptible to these agents (weak recommendation, low-quality evidence).
2. In patients with HAP/VAP caused by Acinetobacter species that is sensitive only to polymyxins, we recommend intravenous polymyxin (colistin or polymyxin B) (strong recommendation, low-quality evidence), and we suggest adjunctive inhaled colistin (weak recommendation, low-quality evidence).
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• Treating VAP with aerosolized antibiotics combined with systemic
antibiotics has bactericidal advantages compared with conventional
treatment with intravenous antibiotics alone.
• To date, however, clinical trials are insufficient to support the broad use
of inhaled antibiotics in critically ill patients with a diagnosis of VAP.
• Future studies should focus on improving delivery systems, patient
selection, and patient respiratory optimization prior to drug nebulization.
Aerosolized Antibiotics during MV
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• Nebulizers or inhalers can be used effectively during mechanical
ventilation
• Correct technique is most important when using these devices
• Frequent and high doses of nebulized β-agonists should be avoided in
mechanically ventilated patients unless there are specific indications for
their use
• Clinical trials are insufficient to support the broad use of inhaled
antibiotics in critically ill patients with a diagnosis of VAP
Take Home Message
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Thank you for your attention !