Defining and diagnosing severe asthma SY9 WAO – WISC2010 Dubai December 2010 Eric D. Bateman Eric D. Bateman MD, MBChB, FRCP, DCH MD, MBChB, FRCP, DCH Professor of Respiratory Medicine, University of Cape Town Professor of Respiratory Medicine, University of Cape Town Director of University of Cape Town Lung Institute Director of University of Cape Town Lung Institute Head, Division of Head, Division of Pulmonology Pulmonology , , Cape Town Cape Town
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Defining and diagnosingsevere asthma
SY9
WAO – WISC2010Dubai December 2010
Eric D. BatemanEric D. BatemanMD, MBChB, FRCP, DCHMD, MBChB, FRCP, DCHProfessor of Respiratory Medicine, University of Cape TownProfessor of Respiratory Medicine, University of Cape TownDirector of University of Cape Town Lung InstituteDirector of University of Cape Town Lung InstituteHead, Division of Head, Division of PulmonologyPulmonology, , Cape TownCape Town
Presenter DisclosuresPresenter DisclosuresEric D Bateman
((((““““difficulty in treatingdifficulty in treatingdifficulty in treatingdifficulty in treating””””))))
Genetic and Genetic and Genetic and Genetic and environmental environmental environmental environmental
factorsfactorsfactorsfactors
Conceptual framework asthma and its managementConceptual framework asthma and its managementConceptual framework asthma and its managementConceptual framework asthma and its management((((ATS/ERS Task Force)ATS/ERS Task Force)ATS/ERS Task Force)ATS/ERS Task Force)
Taylor DR Taylor DR Taylor DR Taylor DR et al, ERJ et al, ERJ et al, ERJ et al, ERJ 2008; 32:5452008; 32:5452008; 32:5452008; 32:545----554554554554
Severity Classification: Cockcroft
Severity TreatmentLevel of control
Very mild None or rare ß2-agonistMild infrequent Well controlled
MildRare ß2-agonist +/- Low-dose ICS
Well controlled
ModerateModerate to high dose ICS + occasional OCS
Well controlled
SevereHigh- to very high-dose ICS + occasional OCS
Well controlled
Very severeVery high dose ICS + Oral CS + additional therapies
Not well controlled
Cockcroft DW, Swystun VA. JACI 1996; 98: 1016-8.
Stoloff SW, Boushey HA. JACI 2006
Responsiveness
SARP: Assessment of Asthma PhenotypesSARP: Assessment of Asthma PhenotypesSARP: Assessment of Asthma PhenotypesSARP: Assessment of Asthma Phenotypes
Moore , WC Moore , WC Moore , WC Moore , WC et al,et al,et al,et al, AJRCCM AJRCCM AJRCCM AJRCCM 2009: epub2009: epub2009: epub2009: epubSevere Asthma Research Program (SARP)Severe Asthma Research Program (SARP)Severe Asthma Research Program (SARP)Severe Asthma Research Program (SARP)
628 variables from 726 patients
IgEFeNO
SputumBAL
Lung function
7-9 pre b.d. afo
10-12 post b.d. response to albuterol
PC20 Meth
Demographics1 Sex2 Race3 BMI4 Age5 Onset of asthma6 Asthma duration
COMPOSITE VARIABLES:14-17 medication use18-19 Health care utilization20-21 Symptoms26-29 Asthma triggers30 Co-morbidities31-32 Family history33 Tobacco exposure34 Women/hormones
Severe Asthma Research Programme: Severe Asthma Research Programme: Severe Asthma Research Programme: Severe Asthma Research Programme: PhenotypingPhenotypingPhenotypingPhenotyping by Cluster Analysisby Cluster Analysisby Cluster Analysisby Cluster Analysis
Moore , WC Moore , WC Moore , WC Moore , WC et al,et al,et al,et al, AJRCCM AJRCCM AJRCCM AJRCCM 2009: epub2009: epub2009: epub2009: epubSevere Asthma Research Program (SARP)Severe Asthma Research Program (SARP)Severe Asthma Research Program (SARP)Severe Asthma Research Program (SARP)
SARP: Tree PerformanceSARP: Tree PerformanceSARP: Tree PerformanceSARP: Tree Performance
Moore , WC Moore , WC Moore , WC Moore , WC et al,et al,et al,et al, AJRCCM AJRCCM AJRCCM AJRCCM 2009: epub2009: epub2009: epub2009: epubSevere Asthma Research Program (SARP)Severe Asthma Research Program (SARP)Severe Asthma Research Program (SARP)Severe Asthma Research Program (SARP)
Severe Severe Severe Severe Severe Severe Severe Severe Atopic Atopic Atopic Atopic Atopic Atopic Atopic Atopic
AsthmaAsthmaAsthmaAsthmaAsthmaAsthmaAsthmaAsthma
Severe Severe Severe Severe Severe Severe Severe Severe Asthma with Asthma with Asthma with Asthma with Asthma with Asthma with Asthma with Asthma with Fixed AirflowFixed AirflowFixed AirflowFixed AirflowFixed AirflowFixed AirflowFixed AirflowFixed Airflow
� Using only preUsing only preUsing only preUsing only pre---- and postand postand postand post----bronchodilator FEV1% predicted and age of onset, 80% bronchodilator FEV1% predicted and age of onset, 80% bronchodilator FEV1% predicted and age of onset, 80% bronchodilator FEV1% predicted and age of onset, 80% were were were were correctly assignedcorrectly assignedcorrectly assignedcorrectly assigned� % = percentage of patients from that cluster correctly assigne% = percentage of patients from that cluster correctly assigne% = percentage of patients from that cluster correctly assigne% = percentage of patients from that cluster correctly assignedddd� N = 728N = 728N = 728N = 728
Severe asthma requiring high intensity treatmentATS / ERS Task Force Asthma Control and Exacerbatio ns
Standardizing Endpoints for Clinical Asthma Trials and Clinical Practice
Good control on high Good control on high intensity treatmentintensity treatment
Poor control despite high intensity treatment
Poor control Poor control despite despite high high intensity treatmentintensity treatment
Treatment responsive, but with persistent
problems e.g. poor adherence,
smoking
Treatment Treatment responsive, but responsive, but with persistent with persistent
problems e.g. poor problems e.g. poor adherence, adherence,
smokingsmoking
Persistent coPersistent co --morbidities e.g. morbidities e.g.
GE reflux, obesityGE reflux, obesity
Treatment Treatment resistant/ resistant/
refractory asthmarefractory asthma
“Severe asthma is defined as the requirement for high intensity treatment after modifiable factors and comorbidites have been
appropriately managed”
Reddel H , et al, Amer J Resp Crit Care Med 2009;180:59-99
• All severe asthma requires confirmed diagnosis of asthma, compliance/adherence and co-morbidities addressed
• All severe asthma requires treatment with “gold standard medication” (for that age group) for 3 months by asthma specialist* to prevent patient from becoming uncontrolled or which remains uncontrolled.
• *Asthma specialist can vary from country to country and from children to adults. In adults, this is traditionally an allergist or pulmonologist/respirologist with advanced training and experience in asthma. In pediatric populations this may also include pediatricians with additional training and experience in severe asthma
WHO: Definition of Severe or Difficult to Manage Asthma
Bousquet J et al, JACI 2010
High dose inhaled CS and LABA (or LT modifier) and / High dose inhaled CS and LABA (or LT modifier) and / or systemic CS for or systemic CS for >>50% of the previous year. 50% of the previous year.
High dose ICS is fluticasone High dose ICS is fluticasone >>1000 mcg/day 1000 mcg/day (or equivalent)(or equivalent)
Definition of Severe or Difficult to Manage Asthma:
Gold Standard TherapyGold Standard Therapy
Bousquet J et al, JACI 2010
FailedStep 3
Levels of CONTROL achieved in GOALTotal or Well Controlled* at 52 weeks
Bateman ED Bateman ED Bateman ED Bateman ED et alet alet alet al, , , , JACIJACIJACIJACI 2010 2010 2010 2010
Any one of the following:
• Poor symptom control: ACQ consistently >1.5 (or “not well controlled” by NAEPP guidelines)
• Frequent exacerbations: 2 or more bursts of systemic CSs (>3 days each) in the previous year
• Severe exacerbations: at least one hospitalization, ICU stay or mechanical ventilation in the previous year
• Persistent airflow limitation: pre-short and long acting bronchodilator FEV1< 80% predicted (in the face of reduced FEV1/FVC)
Definition of Severe or Difficult to Manage Asthma
Definition of Uncontrolled AsthmaDefinition of Uncontrolled Asthma
Bousquet J et al, JACI 2010
Future risk of exacerbations… in relation FEV 1(pre-bronchodilator)
Fuhlbrigge AL et al, JACI 2001;107:61-7.
7070
60
50
40
30
20
10
0
United States
Inci
denc
e of
ast
hma
exac
erba
tions
ov
er n
ext 3
yea
rs
>100 90-100 80-89 70-79 60-69 50-59 <50
FEV1 % predicted
Netherlands
Kitch BT et al, Chest 2004;126:1875-82.
• Controlled asthma on these high doses of inhaled corticosteroids or systemic CS (or additional biologics) places a patient at high future risk for side effects from medications
Definition of Severe or Difficult to Manage Asthma
Bousquet J et al, JACI 2010
Historical = 0.40
Historical = 0.70
0.28
0.090.01
0.42
0.170.07
0.130.05 0.02
0.23 0.19 0.130
0.2
0.4
0.6
0.8
Stratum 1: ICS-naiveStratum 3: Moderate ICS
*Requiring either oral steroids or hospitalisation / emergency visitBateman ED, et al Am J Resp Crit Care 2004
Exacerbation rate in maintenance phase(according to control status achieved in phase I)
Not TC or WC
Well controlled
Total control
Not TC or WC
Well controlled
Total control
Mean exacerbation rate per patient per year
Fluticasone
Salm-FP
HighHigh --dose ICS dose ICS + SABA + SABA vsvs Bud/Form M&RBud/Form M&R
Exa
cerb
atio
ns in
wee
k (%
)
0 4 8 12 16 20 24 28 32 36 40 44 48 52 56
1.6
0.0
2.0
2.4
2.8
3.2
3.6
1.2
0.8
0.4
Week
SameSame--dose ICS/LABA dose ICS/LABA + SABA + SABA vsvs Bud/Form M&RBud/Form M&R
1.6
0.0
2.0
2.4
2.8
3.2
3.6
1.2
0.8
0.4
0 4 8 12 16 20 24 28 32 36 40 44 48 52 56E
xace
rbat
ions
in w
eek
(%)
Week
HigherHigher --dose ICS/LABA dose ICS/LABA + SABA + SABA vs vs Bud/Form M&RBud/Form M&R
0 4 8 12 16 20 24 28
Week
1.6
0.0
2.0
2.4
2.8
3.2
3.6
1.2
0.8
0.4
Exa
cerb
atio
ns in
wee
k (%
)
Patients (% per week) experiencing exacerbations re quiring medical intervention
Week
0 4 8 12 16 20 24 28 32 36 40 44 48 52
10
0
20
30
40
50
56
60
Con
trol
led
and
Par
tly
Con
trol
led
(%)
Week
Con
trol
led
and
Par
tly
Con
trol
led
(%)
0 4 8 12 16 20 24 28 32 36 40 44 48 52
10
0
20
30
40
50
56
60
Week
0 4 8 12 16 20 24 28
10
0
20
30
40
50
60
Con
trol
led
and
Par
tly
Con
trol
led
(%)
Increasing the dose of ICSIncreasing the dose of ICSIncreasing the dose of ICSIncreasing the dose of ICSin the combination inhalerin the combination inhalerin the combination inhalerin the combination inhaler
Bateman ED Bateman ED Bateman ED Bateman ED et al, JACI et al, JACI et al, JACI et al, JACI 2010201020102010
Written self-management plans are associated with improved asthma outcomes
Alexithymia
Alexithymia
= difficulty in perceiving and expressing
emotions and body sensations
� Prevalence: 8 - 19% of males in general population� Toronto Alexithymia Score� Correlates with neuroticism� Negative correlation with Extraversion and Openness
Bagby RM et al, J Pschosom Res 1994; 38: 23 Luminet O Bagby RM et al, J Pschosom Res 1994; 38: 23 Luminet O Bagby RM et al, J Pschosom Res 1994; 38: 23 Luminet O Bagby RM et al, J Pschosom Res 1994; 38: 23 Luminet O et alet alet alet al, J Pers Assess 1999; 73:345, J Pers Assess 1999; 73:345, J Pers Assess 1999; 73:345, J Pers Assess 1999; 73:345Serrano J Serrano J Serrano J Serrano J et alet alet alet al, ERJ 2006; 28: 296 Plaza V , ERJ 2006; 28: 296 Plaza V , ERJ 2006; 28: 296 Plaza V , ERJ 2006; 28: 296 Plaza V et alet alet alet al, J Asthma 2006; 43: 639, J Asthma 2006; 43: 639, J Asthma 2006; 43: 639, J Asthma 2006; 43: 639
Alexithymia more common in patients with near-fatal asthma episodes (36 versus 13%)
More severe asthma, and very severe near-fatal episodes
Severe and Difficult to Manage Asthma
� Severe asthma is common !
� Definition is clinical
� Consider domains to establish cause
� In real life practice, patient factors are most common
� Resistance to treatment is relative and seldom complete
� New second/third line (targeted) controllers are needed