Update in Asthma and COPD: the Hospitalized Patient€¦ · common in COPD than asthma Antibiotics...
Transcript of Update in Asthma and COPD: the Hospitalized Patient€¦ · common in COPD than asthma Antibiotics...
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Update in Asthma and COPD: the Hospitalized Patient
Prescott Woodruff, MD, MPH
Associate Professor of Medicine, UCSF
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Disclosures
Genentech: research grant (completed)
Merck: consultant
Boehringer-Ingelheim: consultant
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Acute Exacerbations of Asthma
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Case 1 24 yo woman with asthma maintained on
fluticasone/serevent (250/50) Exacerbation ongoing for 3 days Not relieved in ED by continuous albuterol nebs and
60 mg prednisone RR 24 sat 92% HR 110 BP 125/90 Dyspneic at rest, interferes with conversation PEFR 40% of predicted Clear sputum Prior hx hospitalization
PEFR drops to <25% predicted, too dyspneic to
speak, perspiring
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Asthma exacerbations Pathophysiology
Occlusion of the bronchial lumen by mucus, cells, thickened/contracted smooth muscle, bronchial wall inflammation and edema.
Leads to: low V/Q ratios
increased work of breathing
dynamic hyperinflation
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Asthma exacerbations Patterns of deterioration
“Type 1” - Slow deterioration inspissated mucus and inflammatory cells
slow to respond to therapy
“Type 2” - Rapid deterioration may not have mucus inspissation,
rapid response to therapy
much less common (~15% of exacerbations)
Woodruff PG Acad Emerg Med 1998
Barr RG Eur Resp J 2000
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Asthma exacerbations Initial therapy
Oxygen Aerosolized albuterol, 2.5mg q 15
mins or continuously Systemic corticosteroids
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Corticosteroids in asthma exacerbations
No good way to synthesize the poorly comparable studies
NAEPP recommends Prednisone 40–80 mg/day in 1 or 2 divided doses,
total course 3–10 days IV corticosteroids if poor response to initial therapy,
no guidance on dose
NAEPP Expert Panel Report 3, 2007
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Asthma exacerbations Other possible therapies
Levalbuterol Antibiotics Methylxanthines Aerosolized ipratropium Heliox Magnesium
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Albuterol is racemic
(equimolar mixture
of stereoisomers)
Levalbuterol: background
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Levalbuterol: rationale
(R)-albuterol is the active drug bronchodilator and bronchoprotective
(S)-albuterol may not be simply inert
intensifies bronchoconstriction? induces hypersensitivity? promotes activation of eosinophils?
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Levalbuterol: weakness in rationale
Structure of the β-receptor/ligand interaction predicts that only (R)-albuterol should bind
On direct comparison:
R- and RS-albuterol have similar dose-related effects on FEV1, HR, K+ in laboratory setting
Neither S-albuterol nor placebo have any effects
Lotvall JACI 2001
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Levalbuterol: non-supportive adverse effects
data “In the clinical trials, a slightly greater
number of serious adverse events and clinically significant ECG changes were reported in patients who received Xopenex 1.25mg as compared to the other active treatment groups.”
Xopenex® package insert
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Conflicting Reviews to date
PRO Levalbuterol: pharmacologic properties and use in
the treatment of pediatric and adult asthma. Berger WE. Ann Allergy Asthma Immunol. 2003 Jun;90(6):583-91;
Single-isomer levalbuterol: a review of the acute data. Nowak R. Curr Allergy Asthma Rep. 2003 Mar;3(2):172-8.
CON Levalbuterol nebulizer solution:is it worth five
times the cost of albuterol? Asmus MJ. Pharmacotherapy 2000;20(2)123-9
Single-enantiomer drugs: elegant science, disappointing effects. Mansfield P Clin Pharmacokinet. 2004;43(5):287-90.
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Asthma exacerbations Other possible therapies
Levalbuterol Antibiotics Methylxanthines Aerosolized ipratropium Heliox Magnesium
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Antibiotics
Not generally recommended except:
To treat “comorbid conditions”
Pneumonia
Sinusitis
Presence of fever and purulent sputum
NAEPP Expert Panel Report 3, 2007
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Asthma exacerbations Other possible therapies
Levalbuterol Antibiotics Methylxanthines Aerosolized ipratropium Heliox Magnesium
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Methylxanthines
Not recommended at all Does not improve lung function in hospitalized adults
Poor ratio of efficacy to toxicity
Parmeswaman 2000
NAEPP Expert Panel Report 3, 2007
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Asthma exacerbations Other possible therapies
Levalbuterol Antibiotics Methylxanthines Aerosolized ipratropium Heliox Magnesium
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Ipratropium: con
Not recommended for hospitalized patients by the NAEPP EPR because No benefit seen in two RCTs of hospitalized
children
No data on hospitalized adults
…but I use it because
NAEPP Expert Panel Report 3, 2007 Craven 2001 Goggin 2001
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Ipratropium: pro
Meta-analysis of ipratropium in emergency management of adults with acute asthma
Eligible studies RCT, double blind, placebo controlled
ipratropium as adjunctive therapy to beta-agonists
Measurements improvement in FEV1
hospital admission
Stoodley et al. Ann Emerg Med 1999;34:8
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Results Ipratropium provides an additional 7.3% improvement
in FEV1 (approximately 100 ml)
Associated with a decreased risk of hospitalization (RR=0.73, 95% CI 0.53-0.99)
Not associated with any additional adverse effects
Stoodley et al. Ann Emerg Med 1999;34:8
Ipratropium: pro
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Asthma exacerbations Other possible therapies
Levalbuterol Antibiotics Methylxanthines Aerosolized ipratropium Heliox Magnesium
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Heliox: background
Helium: low MW => density 4-fold less than air
Lower Reynolds number => laminar flow
Heliox: a mixture of helium and oxygen available with helium concentrations ranging from 60-80%
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Heliox: example of a clinical study
23 adults presenting to the ED with severe acute asthma (poor response to albuterol x 2)
Randomization heliox (70%/30%), or 30% oxygen
Measurements PEFR, dyspnea score, HR, RR at 20-480 mins
Kass et al. Chest 1999
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Heliox: other clinical studies
Other RCTs have found no benefit 2 recent systematic reviews/meta-analyses:
Slight benefit in first hour of use insufficient data on harder clinical outcomes such as
intubation, ICU admission rates, duration of hospitalization, or mortality
Ho AM Chest 2003
Rodrigo GJ Chest 2003
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Asthma exacerbations Other possible therapies
Levalbuterol Antibiotics Methylxanthines Aerosolized ipratropium Heliox Magnesium
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Intravenous magnesium
2 RCTs in adults demonstrate improved lung function in subjects with severe obstruction (FEV1 < 25% predicted) when used as adjunct to albuterol and steroids
Adult dose: 2 gms IV MgSO4 in 50ml NS infused over 10-15 mins
Silverman RA, Chest 2002
Bloch H, Chest 1995
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Asthma exacerbations Ventilator management
Controlled modes
Typically, high FiO2 is not required
Permissive hypercapnia - well tolerated
Increase expiratory time – slow respiratory rate
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Asthma exacerbations the pregnant patient
Goal PaCO2 = 28-35 mmHg (as acidosis reduces uteroplacental flow)
Standard asthma therapies are not contraindicated
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Case 1 24 yo woman with asthma maintained on
fluticasone/serevent (250/50) Exacerbation ongoing for 3 days Not relieved in ED by continuous albuterol nebs and
60 mg prednisone RR 24 sat 92% HR 110 BP 125/90 Dyspneic at rest, interferes with conversation PEFR 40% of predicted Clear sputum Prior hx hospitalization
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Case 1
Which of the following are recommended therapy?
A. Antibiotics B. Systemic corticosteroids C. IV magnesium sulfate D. All of the above
24 yo woman with asthma maintained on fluticasone/serevent (250/50)
Not relieved in ED by continuous albuterol nebs and 60 mg prednisone
RR 24 sat 92% HR 110 BP 125/90 Dyspneic at rest, interferes with conversation PEFR 40% of predicted Clear sputum
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Asthma exacerbations Other therapies: review
Levalbuterol value over albuterol is uncertain Antibiotics only in certain circumstances Methyxanthines NO Aerosolized ipratropium I use it Heliox may have short term value Magnesium YES, if severe (PEFR<25% predicted)
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Acute Exacerbations of COPD
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Case 2 74 yo man with COPD maintained on
albuterol/ipratropium and tiotropium Exacerbation ongoing for 3 days Not relieved in ED by continuous albuterol nebs and
60 prednisone RR 22 sat 92% on 2L 02 HR 110 BP 125/90 Dyspneic at rest, interferes with conversation Green sputum Prior hx hospitalization
Later: Paradoxical breathing
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COPD exacerbations Pathophysiology
Occlusion of the bronchiolar lumen by mucus, cells, thickened/contracted smooth muscle, bronchial wall inflammation and edema.
Leads to: low V/Q ratios
increased work of breathing
dynamic hyperinflation
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Differences from Asthma
Have chronic small airway disease and emphysema Are older, weaker, have more comorbid conditions More likely to have bacterial infection
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COPD exacerbations Therapeutic options
Oxygen…judiciously… check ABG in 30 mins
Aerosolized albuterol and ipratropium Corticosteroids Antibiotics Consider non-invasive ventilation
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Corticosteroids
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Corticosteroids in patients hospitalized for AECOPD
Two well-done RCTs In non-acidotic patients, 30 mg prednisolone every
day for 14 days is superior to placebo1
A higher dose regimen starting with IV solumedrol (125mg q6h) for either 2 wks or 8 wks is better than placebo, with fewer side effects with a 2 wk course2
GOLD guidelines recommend 30-40mg prednisone for 10-14 days but, but do not differentiate hospitalized pts from outpatients, and the evidence is “D”
Davies, Lancet 1999
Niehwoehner, NEJM 1999
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Corticosteroids in patients hospitalized for AECOPD
Recent RCT in JAMA 40 mg prednisone for 5 days versus 14 days Non-inferiority study
Leuppi JAMA 2013
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From: Short-term vs Conventional Glucocorticoid Therapy in Acute Exacerbations of Chronic Obstructive Pulmonary Disease: The REDUCE Randomized Clinical Trial
JAMA. 2013;309(21):2223-2231. doi:10.1001/jama.2013.5023
A, Proportions of patients without reexacerbation in the intention-to-treat analysis. B, Proportions of patients without reexacerbation in the per-protocol analysis. Survival curves did not differ significantly when compared by the log-rank test. Hazard ratios for the short-term vs conventional treatment group were 0.95 (90% CI, 0.70-1.29; P for noninferiority = .006) in the intention-to-treat analysis and 0.93 (90% CI, 0.68-1.26; P for noninferiority = .005) in the per-protocol analysis. P values were obtained using the Wald test.
Figure Legend:
Leuppi JAMA 2013
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Corticosteroids in patients hospitalized for AECOPD
Recent RCT in JAMA 40 mg methylprednisolone x 1 then 40 mg
prednisone for a total of 5 days versus 14 days Non-inferiority study No difference in re-exacerbations or survival Slightly lower hosp LOS in short-term therapy group
(8 vs 9 days, p=0.04) No difference in FEV1 while an inpatient No difference in glucocorticoid side effects
Leuppi JAMA 2013
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Corticosteroids in patients hospitalized for AECOPD
One person’s synthesis 40 mg prednisone for 5 days likely adequate for most
hospitalized COPD patients Prefer a higher dose IV regimen for patients admitted
to the ICU
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COPD exacerbations Therapeutic options
Oxygen…judiciously… check ABG in 30 mins
Aerosolized albuterol and ipratropium Corticosteroids Antibiotics Consider non-invasive ventilation
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Antibiotics in patients hospitalized for AECOPD
Bacterial infection during exacerbation is more common in COPD than asthma
Antibiotics recommended by GOLD for: Increased sputum volume with either increased
sputum purulence or dyspnea Require mechanical ventilation (invasive or non-
invasive) GOLD recommended course is 5-10 days In severe illness, consider pseudomonas and even
PCP
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COPD exacerbations Therapeutic options
Oxygen…judiciously… check ABG in 30 mins
Aerosolized albuterol and ipratropium Corticosteroids Antibiotics Consider non-invasive ventilation
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COPD Exacerbations Non-invasive Ventilation
Indications Acidosis (pH<7.35) and PCO2 (>45mmHg) Severe dyspnea, increased work of breathing, resp
muscle fatigue (accessory muscles, retractions, paradoxical motion of the abdomen)
Contraindications Resp arrest, CV instability Impaired mental status Aspiration risk, recent facial, GE surgery Facial trauma/abnormality Extreme obesity
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COPD Exacerbations Mechanical Ventilation
(intubated)
Concerned about air trapping
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COPD Exacerbations Mechanical Ventilation
(intubated)
Air-trapping: use a slow respiratory rate
Allow permissive hypercapnia
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Questions
Which of the following are recommended?
A. Antibiotics B. Systemic corticosteroids C. Non-invasive mechanical ventilation D. All of the above
74 yo man with COPD maintained on albuterol/ipratropium and tiotropium
Not relieved in ED by continuous albuterol nebs and 60 prednisone
RR 22 sat 92% on 2L 02 HR 110 BP 125/90 Green sputum Paradoxical breathing
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COPD exacerbations Therapeutic options:
review
Oxygen…judiciously… check ABG in 30 mins
Aerosolized albuterol and ipratropium YES
Corticosteroids (40mg daily, 5 day total course OK for most patients)
Antibiotics (usually) Consider non-invasive ventilation early in
respiratory failure