copd journal club
DESCRIPTION
internal medicineTRANSCRIPT
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SHORT-TERM VS CONVENTIONAL
GLUCOCORTICOID THERAPY IN ACUTE EXACERBATIONS
OF COPD
Melanie Mier PGY4
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COPD A common, preventable and treatable
disease Characterized by persistent airflow
limitation that is usually progressive associated with an enhanced chronic
inflammatory response in the airways and the lung to noxious particles or gases
Exacerbations and comorbidities contribute to the overall severity in individual patients
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Mechanisms Underlying Airflow Limitation in COPD
Small Airways Disease• Airway inflammation• Airway fibrosis, luminal
plugs• Increased airway
resistance
Parenchymal Destruction• Loss of alveolar
attachments• Decrease of elastic recoil
AIRFLOW LIMITATION
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Burden of COPD
COPD is a leading cause of morbidity and mortality worldwide.
The burden of COPD is projected to increase in coming decades due to continued exposure to COPD risk factors and the aging of the world’s population.
COPD is associated with significant economic burden.
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Risk factors for COPD
Aging Populations
Genes
Infections
Socio-economic status
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SYMPTOMS
chronic coughshortness of breath
EXPOSURE TO RISKFACTORS
tobaccooccupation
indoor/outdoor pollution
SPIROMETRY: Required to establish diagnosis
Diagnosis of COPD
è
sputum
presence of a post-bronchodilator FEV1/FVC < 0.70 confirms the presence of persistent airflow limitation and
thus of COPD
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Symptoms
Dyspnea: Progressive, persistent and characteristically worse with exercise.
Chronic cough: May be intermittent and may be unproductive.
Chronic sputum production: COPD patients commonly cough up sputum.
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Spirometry: Obstructive Disease
Volu
me,
liters
Time, seconds
5
4
3
2
1
1 2 3 4 5 6
FEV1 = 1.8L
FVC = 3.2L
FEV1/FVC = 0.56
Normal
Obstructive
© 2014 Global Initiative for Chronic Obstructive Lung Disease
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COPD flow loop
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Classification of Severity of Airflow Limitation in COPD*
In patients with FEV1/FVC < 0.70:
GOLD 1: Mild FEV1 > 80% predicted
GOLD 2: Moderate 50% < FEV1 < 80% predicted
GOLD 3: Severe 30% < FEV1 < 50% predicted
GOLD 4: Very Severe FEV1 < 30% predicted
*Based on Post-Bronchodilator FEV1
© 2014 Global Initiative for Chronic Obstructive Lung Disease
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Therapeutic Options: COPD Medications
Beta2-agonists
Short-acting beta2-agonists
Long-acting beta2-agonists
Anticholinergics
Short-acting anticholinergics
Long-acting anticholinergics
Combination short-acting beta2-agonists + anticholinergic in one inhaler
Combination long-acting beta2-agonists + anticholinergic in one inhalerMethylxanthines
Inhaled corticosteroids
Combination long-acting beta2-agonists + corticosteroids in one inhaler
Systemic corticosteroids
Phosphodiesterase-4 inhibitors© 2014 Global Initiative for Chronic Obstructive Lung Disease
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Treatment Bronchodilator medications are central to symptomatic
management of COPD The principal bronchodilator treatments are
beta2-agonists, anticholinergics, theophylline or combination therapy
Long-acting inhaled bronchodilators reduce exacerbations and related hospitalizations and improve symptoms and health status.
Regular treatment with inhaled corticosteroids improves symptoms, lung function and quality of life and reduces frequency of exacerbations for COPD patients with an FEV1 < 60% predicted
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Treatment An inhaled corticosteroid combined with a long-
acting beta2-agonist is more effective than the individual components in improving lung function and health status and reducing exacerbations in moderate to very severe COPD
Addition of a long-acting beta2-agonist/inhaled glucorticosteroid combination to an anticholinergic (tiotropium) appears to provide additional benefits
Chronic treatment with systemic corticosteroids should be avoided because of an unfavorable benefit-to-risk ratio
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Exacerbation
An acute event characterized by worsening of the patients respiratory symptoms that is beyond normal day to day variations and leads to a change in medication
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Risk of exacerbation
Two or more exacerbations within the last year or an FEV1 < 50 % of predicted value are indicators of high risk.
One or more hospitalizations for COPD exacerbation should be considered high risk.
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Impact on symptoms
and lungfunction
Negativeimpact on
quality of life
Consequences Of COPD Exacerbations
Increasedeconomic
costs
Acceleratedlung function
decline
IncreasedMortality
EXACERBATIONS
© 2014 Global Initiative for Chronic Obstructive Lung Disease
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Most common causes of COPD exacerbations are viral URIs and infection of the tracheobronchial tree
Diagnosis relies exclusively on clinical presentation of the patient
Goal of treatment is to minimize the impact of the current exacerbation and prevent future exacerbations
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Exacerbation assessments ABG: PaO2 < 8.0 kPa with or with out PaCO2 >
6.7 kPa when breathing room air indicates respiratory failure.
CXR: exclude alternative diagnosis EKG: may aid in diagnosis of coexisting cardiac
problem CBC: identify polycythemia, anemia, or bleeding Purulent sputum during exacerbation: indication to
begin empirical antibiotic treatment Biochemical tests: detect electrolyte disturbances,
diabetes, and poor nutrition Spirometry: not recommended during an exacerbation
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Treatment Oxygen: titrate to improve the patients hypoxemia
with a target saturation of 88-92% Bronchodilators: Short acting inhaled beta2
agonists with or without short acting anticholinergics Systemic Corticosteroids: shorten recovery time,
improve lung function and arterial hypoxemia and reduce the risk of early relapse, treatment failure, and length of hospital stay. A dose of 40mg of prednisone a day for 5 days is recommended
Antibiotics: given to patients with increased dyspnea, increased sputum volume, and increased sputum purulence or who require mechanical ventilation
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Indications for hospitalization Marked increased in intensity of
symptoms Onset of new physical signs Failure of an exacerbation to respond to
initial medical management Presence of serious comorbidities Frequent exacerbations Older age Insufficient home support
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Steroids
shorten recovery time, improve lung function and arterial hypoxemia and reduce the risk of early relapse, treatment failure, and length of hospital stay.
A dose of 40mg of prednisone a day for 5 days is recommended??
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REDUCE Randomized clinical trial Tested the hypothesis that in patients
presenting to the ED with acute exacerbation of COPD, a 5 day course of systemic glucocorticoid treatment would not result in an inferior clinical outcome compared with conventional 14 day treatment, but would significantly decrease glucocorticoid exposure and reduce untoward effects
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Why care about steroids? Long term use of glucocorticoids is in an
independent risk factor for increased mortality in COPD
Given the adverse effect of glucocorticoids and the potentially large number of exacerbations occurring in patients with COPD, glucocorticoid exposure should be minimized
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Adverse effects of glucocorticoids
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Design From March 2006 through February
2011 consecutive patients with exacerbated COPD were screened for eligibility at ED of 5 Swiss hospitals
Inclusion criteria: exacerbation of COPD as defined by 2 of the following:Change in baseline dyspnea, cough, or
sputum quality or purulenceAge older than 40 yearsSmoking history of 20 pack years or more
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Exclusion criteria: History of asthmaFEV1/FVC greater than 70% as evaluated
by bedside post-bronchodilator spirometry prior to randomization
Radiological diagnosis of pneumoniaEstimated survival of less than 6 mos due to
severe comorbidityPregnancy or lactationInability to give written consent
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Study Drugs, Randomization,and Masking
Randomly assigned either 5 or 14 days of systemic glucocorticoids using a centralized secured study website
Used a computer generated randomization list based onAge stratified blocks of 6Presence or absence of systemic
glucocorticoid treatment prior to studySeverity of COPD according to the GOLD
classification
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All patients received 40mg of IV methylprednisolone on day 1
Followed by 40mg of oral prednisone daily from day 2-5
From day 6 to 14 patients received 40mg oral prednisone or matching placebo once daily
Patients, caregivers, outcome assessors, data collectors, the biostatistician and all other investigators remained blinded
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All patients received a broad spectrum antibiotic for 7 daysAn inhaled, nebulized short acting bronchodilator
4-6 times prn while inpatient Inhaled glucocorticoids twice daily combined
with inhaled Beta agonist twice daily plus tiotropium once daily
CPT, supplemental O2, and ventilation used as needed
Additional steroids could be given at discretion of physician
End points assessed daily during hospitalization and on days 6, 15, 30, 90, and 180
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End points Primary endpoint:
time to next COPD exacerbation during a follow up of 6 months (during index exacerbation or during follow up)
Secondary endpoints:All cause mortalityChange in FEV1Cumulative glucocorticoid doseClinical performance (questionnaire)
Assessed length of hospital stay and severity Assessed glucocorticoid associated adverse events:
New or worsening hyperglycemiaNew or worsening HTNNew infectionOther potentially related adverse events
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Statistical Analysis Modified Delphi technique to define non-inferiority regarding
primary endpoint 11 board certified specialists who defined a 15% absolute
difference in the percentage of patients with a re-exacerbation during the 6 month follow up period as the clinically tolerable upper limit
According to the non-inferiority definition the true proportion of patients under experimental treatment experiencing a COPD exacerbation must not exceed 65% Translate to critical hazard ratio of 1.515 based on n exponential
proportional hazards survival model Differences in time to next exacerbation or time to death were
assessed using Kaplan-Meier method in combination with the log rank test and Cox proportional hazards model.
Non-inferiority was concluded if the 2 sided 90% confidence interval for the HR between the short term and the conventional treatment group in an intention to treat and per protocol analysis was below 1.515.
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Primary endpoint Time to re-exacerbation did not differ
between groups Figure 2
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The HR of re-exacerbation between the short term and conventional treatment group was 0.95 in intention to treat and 0.93 in the per-protocol analysis, meeting the non-inferiority criteria
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Median time to re-exacerbation was was 43.5 days in the short term group and 29 days in the conventional group
Estimates of re-exacerbation rates were 37.2% in the short term and 38.4% in the conventional group
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Secondary end points
Overall survival did not differ between the groups
Figure 3
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Table 3
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During hospital stay there was no difference in the requirement for mechanical ventilation.
Shortterm treatment group had shorter hospital stay by 1 day (8 vs 9)
Short term group had mean cumulative dose of 379mg and conventional group mean of 793mg
New or worsened hyperglycemia was observed in 74 pts in short term and 74 in conventional group
HTN developed or worsened in 15 pts in the short term group and 23 pts in the conventional group
No differences in infection rates or other potentially glucocorticoid related adverse effects like GI bleed, insomnia, fractures, psychiatric sx, or heart failure
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Limitations No standard glucocorticoid regimen for treatment of
COPD exacerbations at time of trial design All patients were treated with inhaled long acting beta
agonists, glucocorticoids and tiotropium – overtreatment Less HTN in short term treatment patients, difference
was not significant Focused on hyperglycemia and HTN during
hospitalization, too short of time period to really assess these
All patients received antibiotics regardless of sputum purulence
Most patients had severe or very severe COPD All patients were current or past smokers
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Final summary of results
A 5 day glucocorticoid treatment course was non-inferior to a 14 day course in respect to re-exacerbation during a 6 month follow up
No significant difference in recovery of lung function and disease related symptoms but shorter course resulted in a significantly reduce glucocorticoid exposure
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References Leuppi, J, Schuetz P. Short-term vs conventional
glucocorticoid therapy in acute exacerbations of chronic obstructive pulmonary disease. JAMA. 2013;309(21):2223-2231.
Global Initiative for Chronic Obstructive Lung Disease. Global strategy for the diagnosis, management and prevention of COPD. http://www.goldcopd.org/guidelines/guidelines-resources.htm
http://www.hindawi.com/journals/ije/2012/485376.fig.002.jpg
And now, the statistics discussion…
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Hazard Ratios
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What is hazard? What is a hazard ratio?How is hazard different from relative risk?How can it be interpreted?
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Hazard
h(t)- “the probability that an individual who is under observation at a time (t) has an event at that time”
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Hazard Ratios
“A measure of how often a particular event happens in one group compared to how often it happens in another group, over time. Hazard ratios are often used in clinical trials to measure survival at any point in time in a group of patients who have been given a specific treatment compared to a control group given another treatment or a placebo.”
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Interpretation
“A hazard ratio of one means that there is no difference in survival between the two groups. A hazard ratio of greater than one or less than one means that survival was better in one of the groups.”
HR= 1HR= 0.5HR= 2
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Resources
http://www.medicine.ox.ac.uk/bandolier/painres/download/whatis/what_are_haz_ratios.pdf
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC478551/pdf/1409-03.pdf
http://www.cancer.gov/dictionary?cdrid=618612
http://www.youtube.com/watch?v=z1b2hFzXsrU