severe acute asthma in the emergency department: cts symposium
DESCRIPTION
Severe Acute Asthma in the Emergency Department: CTS Symposium. Brian H. Rowe, MD, MSc, CCFP(EM) Canada Research Chair in Emergency Airway Diseases Associate Dean (Clinical Reseaerch), FoMD Professor, Department of Emergency Medicine University of Alberta. Conflicts. - PowerPoint PPT PresentationTRANSCRIPT
Severe Acute Asthma in the Emergency Department:
CTS Symposium.
Brian H. Rowe, MD, MSc, CCFP(EM)Canada Research Chair in Emergency Airway Diseases
Associate Dean (Clinical Reseaerch), FoMD
Professor, Department of Emergency Medicine
University of Alberta
Conflicts
• Support for the studies reported in this talk:– CIHR (ON);– Physician's Services Inc. (PSI) Foundation (ON);– Medical Services Inc. (MSI) Foundation (AB);– University of Alberta Hospital Foundation (AB) – Canadian Assoc. of Emergency Physicians (CAEP);– Emergency Health Services - RAC (ON);– Department of Emergency Medicine, U of Alberta;– Drugs supplied: AZ, GSK;– Partial study funding: GSK.
• The presenter is not a paid employee or consultant for any sponsor except the University of Alberta.
Outline
• Epidemiology of acute/ED asthma.• Severity assessment.• Predictors of admission and relapse.• CTS-CAEP asthma guidelines.
– In-ED management;– After-ED management.
• Summary.
Pathophysiology - Asthma
• Definition: relapsing chronic disease characterized by symptoms of dyspnea.
• Pathophysiology: – Primary: Airway inflammation (heterogeneity);
– Secondary: broncho-constriction (most symptoms);
– Long-term: may produce inflammatory scarring and fixed obstruction.
• Summary: treatment addresses primary inflammation and secondary bronchospasm.
ED Asthma
• Asthma exacerbations are common ED presentations.
• Exacerbations result in significant:– Costs to the health care system;– Impairments in quality of life for patients;– Lost time from work, school or activities.
• Potential for serious sequelae:– Hospitalizations and complications; – Rarely - death.
Asthma – how it should be treated…
Asthma – how it is treated…
ED Asthma Visits in Alberta
• ACCS methods:– Data on 104 EDs in Alberta;– All ED encounters;– Trained and supervised medical records
nosologists code each chart.
• Validity of ED diagnosis of asthma:– Comparison of respiratory presentations by
multiple ED physicians: asthma > COPD > LRI >>> URI reliability.
Rowe BH, et al. Chest. 2009
A person visits an Alberta ED every 16 minutes with asthma
• Over 6 yrs, 200,000 visits
• 93,150 people
• Adults – 105,813 visits
• Children– 94,187 visits
• 1.8% to 2.4% of all ED visits
• 2.1 visits/person, 63% only one visit
Age specific ED visit rates/1000
24.8 per 1000(22.9 to 26.6)
2.6 times higher rates
Age group and gender directly standardized rates (DSRs) per 1000
In 2004/5, Welfare group (<65yr) had
19.2 per 1000(17.9 to 20.5)
12.4 per 1000(11.7 to 13.1)
9.5 per 1000(9.3 to 9.7)
Summary
• ED asthma in Alberta is declining but still common:– Confirmation: Teresa To/ICES data.
• Admission rates remain stable.• Children present more frequently than adults.• There is considerable room for improvement in
acute asthma care in Canada!– Confirmation: Diane Lougheed et al.
Severity assessment (CAEP/CTS)
Mild Moderate Severe PEFR > 60% predicted
> 300 L/min 40-60% predicted
200-300 L/min Unable
< 40% predicted <200 L/min
FEV-1 > 60% predicted > 2.1 L
40-60% predicted 1.6-2.1 L
Unable <40% predicted
<1.6 L SaO2
- -
< 90%
Hx Increased -agonists
Exertional dyspnea + cough
Partial relief from -agon -agonist q 4 hours dyspnea, cough @ rest
No relief -agonists -agonist > q 2 hours
agitated
Physical -
-
Diaphoretic Tachycardic
ED (simple) Approach
A d m it to ho sp ita l1 0%
P a tie n t un cha ng ed , se ve re o r d e te r io ra te s.
? R x
O n IC SM od era te -se ve re
e xacerb a tion
? R x
N o t on IC SM od era te -se ve re
e xacerb a tion
? R x
V ery m i lde xacerb a tion
P E FR 7 0-8 0%@ p resen ta tion
D isch arg e h om e9 0%
P atie n t im prov esM e ets D /C c ri te r ia
A cu te A s thm a P rese n ta tion to the E DR x in E D a n d re -a sse ss
90% of visits resulted in discharges from EDs in 2004/2005
Discharged 179,585
Discharged from program of clinic
757
Left against medical advice 902
Admitted to CCU or OR 511
Admitted to other area 16,930
Admitted to another facility
1,205
Expired in ambulatory care service
21
Expired on arrival to ambulatory care service
5
Left without being seen 84
Rowe BH, et al. Chest. 2009
Westfall, J. M. et al. JAMA 2007;297:403-406
Translational model
Finding the evidence
2011
Especially productive EM group: Cochrane Airways Group.
Cochrane in-ED asthma treatments:
• Beneficial effect confirmed:– MDI + spacers vs nebulization (Cates);– Early systemic corticosteroids (Rowe); – Inhaled CS (Edmonds);– Anticholinergics (Plotnick);– Early systemic magnesium sulfate (Rowe).
• Beneficial effect lacking:– Antibiotics (Graham);– Heliox (Rodrigo);– Aminophylline (Belda).
• Insufficient evidence: NIV.
Hodder R, et al. Can Med Assoc J. 2010
CTS-CAEP Asthma Guideline
• Inhaled SABA:– Recommends salbutamol.
• Inhaled SAAC:– Recommends IB to reduce admission.
• Systemic corticosteroids:– Recommends SCS to reduce admission.
• Adjunctive care:– IV MgSO4, ICS, IM epinephrine, NIV?
Hodder R, et al. Can Med Assoc J. 2010
Nebulizers vs MDI + Spacers?
• Evidence:– Cochrane Review (high quality);– Wide search updated 2009;– Search identified 27 trials (2295 children and
614 adults) from ED and community settings. – Variable spacer devices (doesn't seem to make
a difference) and doses (higher doses don’t seem to be more efficacious).
– Outcomes sub-grouped into peds and adults.
Nebulizers vs MDI + Spacers?
Cates CA, et al. CL 2010. Outcome: admissions.
Nebulizers vs MDI + Spacers?
Cates CA, et al. CL 2010. Outcome: LOS in ED.
Nebulizers vs MDI + Spacers?
Cates CA, CL 2010. Outcome: Rise in pulse rate (% baseline).
Canadian data
• Survey of the use of nebulizers and spacers in Canadian Pediatric EDs (83% response).
• Overall, 21% of emergency physicians used MDI and spacer.
• The largest perceived barriers amongst non-users included safety and costs, and the lack of a physician champion for change.
• Gradient from East (more use) to West (less use) in Canada.
Osmond M, et al. Acad Emerg Med 2007; 14:1106–1113.
Summary
• Patients with life threatening asthma exacerbations were excluded from the studies, so the results cannot be assumed to apply to this group.
• Analysis of the data regarding lung function tests in many papers was complicated by a lack of standardized reporting.
• MDI + spacer conclusion: – Children - superiority proven; – Adults – no differences vs. equivalence.
CTS-CAEP Asthma Guideline
• Inhaled SABA:– Recommends salbutamol.
• Inhaled SAAC:– Recommends IB to reduce admission.
• Systemic corticosteroids:– Recommends SCS to reduce admission.
• Adjunctive care:– IV MgSO4, ICS, IM epinephrine, NIV?
Hodder R, et al. Can Med Assoc J. 2010
Anticholinergics (ipratropium bromide)
• During the ED stay– P: 2189 patients, > 18 years of age;– D: 7 high quality RCTs;– I: single/multiple IB compared to placebo;– O: 26% reduction to hospital (RR = 0.74; 95%
CI: 0.60 to 0.89, with a NNT of 9);
– O: increase in early FEV1: modest with single (ES = 0.34); large with multiple (ES = 0.78).
• Summary: use often and early.
IB + SABA in the ED
CTS-CAEP Asthma Guideline
• Inhaled SABA:– Recommends salbutamol.
• Inhaled SAAC:– Recommends IB to reduce admission.
• Systemic corticosteroids:– Recommends SCS to reduce admission.
• Adjunctive care:– IV MgSO4, ICS, IM epinephrine, NIV?
Hodder R, et al. Can Med Assoc J. 2010
Systemic Corticosteroids
• During the ED stay– Mainstay of ED asthma
treatment.
• CAEP AIR study:– 96% SABA (3);– 85% SAAC (3);– 78% of ED patients
received SCS.
• What’s the evidence?
Rowe BH, et al. Acad Emerg Med 2008; 15:709–717
Rowe BH, et al. Cochrane Library, Version 1. 2007
Systemic CS to prevent admission
• During the ED stay– P: 863 patients (435 corticosteroids; 428
placebo);– D: 12 variable quality RCTs;– I: systemic CS compared to “SOC”;– O: reduction in admissions (RR = 0.75; 95%
CI: 0.64, 0.85; NNT = 8);– O: earlier treatment, earlier effects observed.
• Summary: use often and early.
Rowe BH, et al. Cochrane Library, Version 1. 2007
SCS - admissions
CTS-CAEP Asthma Guideline
• Inhaled SABA:– Recommends salbutamol.
• Inhaled SAAC:– Recommends IB to reduce admission.
• Systemic corticosteroids:– Recommends SCS reduces admission.
• Adjunctive care:– IV MgSO4, ICS, IM epinephrine, NIV?
Hodder R, et al. Can Med Assoc J. 2010
Rowe BH, et al. Cochrane Library, Version 1. 2007
In-ED use of MgSO4 (admissions)
In-ED use of ICS (admissions)
Treatment after discharge
Preventing relapses
Alberta data - Relapse to ED
~6.4% individuals had a repeat ED visit at 7 days.
Alberta Data - next MD visit
~35% had at least one (non-ED) follow-up visit within 7 days for any reason; time to first F/U = 19 days (95% CI: 18 to 21).
Follow-up
• Relapse occurs following discharge and other evidence suggests treatment plays a role.
• Guidelines recommend follow-up for reassessment and educational reinforcement.
• Follow-up after ED remains less than ideal and so ED MDs need to ensure patients are covered during the sub-acute phase.
Cochrane post-ED asthma treatments:
• Beneficial effect confirmed:– Early PO corticosteroids (Rowe);
– Inhaled CS (Edmonds);
– Non-pharmacological approaches:• Action plans and regular follow-up (multiple).
• Beneficial effect lacking:– Antibiotics (Graham);
– Non-pharmacological approaches;
– Nutritional supplementation.
• Insufficient evidence: LABA, LKTs.
Hodder R, et al. Can Med Assoc J. 2010
CTS-CAEP Asthma Guidelines
• Systemic corticosteroids:– Recommends SCS to reduce relapse.
• Inhaled corticosteroids:– Recommends ICS to reduce relapse.
• Adjunctive care:– Close follow-up, asthma education, smoking
cessation, immunizations, AAP.
Hodder R, et al. Can Med Assoc J. 2010
Cochrane Review• Following the ED stay:
– D: Randomized controlled trials (7; quality RCTs);
– P: acute asthma discharged (374 pts, all ages);– I: “SCS” (oral/IM) for 7-10 days;– C: vs “standard care”;– O: reduction in relapse (RR: 0.39; NNT: 5);– O: reduction in use of beta-agonists (2/day).
Systemic CS: preventing relapses
Summary
• Unless contra-indicated, systemic corticosteroids should be prescribed for acute asthma at discharge.
• IM corticosteroids as effective as oral agents (advantage: compliance; disadvantage: injection pain/bruising).
• Tapering corticosteroids, not generally felt to be necessary (several trials to support this).
CTS-CAEP Asthma Guidelines
• Systemic corticosteroids (SCS):– Recommends SCS to reduce relapse.
• Inhaled corticosteroids:– Recommends ICS to reduce relapse.
• Adjunctive care:– Close follow-up, asthma education, smoking
cessation, immunizations, AAP.
Hodder R, et al. Can Med Assoc J. 2010
Flow chart – CS + ICS vs CS alone
Emergency DepartmentTreatment
SABA 2 puffs QID + Prednisone 50 mg OD
SABA 2 puffs QID + Prednisone 50 mg OD
R
Visit: 1 Telephone Clinic Visit
Week: 0 10-14 days 4 weeks
Placebo Turbuhaler/day X 4 weeks
Emergency Department discharge
Budesonide 1600ug/day X 4 weeks
Rowe BH, et al. JAMA 1999
ICS
No ICS
0 7 14 21Time to Relapse (days)
Number at RiskICS
No ICS89 80 77 7791 77 74 68
0
10
20
30
40
50
60
70
80
90
100
% R
ela
pse
Fre
eRelapse
Rowe BH, et al. JAMA 1999
ICS
• Following the ED visit:– D: 10 high quality RCTs; – P: patients discharged from ED, all ages;– I: ICS for 7-21 days;– C: +/- oral prednisone + -agonists;– O: relapse to additional care;– Comparisons:
• Primary: ICS + CS vs CS;
• Secondary: ICS vs CS.
ICS + CS vs CS Evidence
Edmonds ML, et al. Cochrane Library 2007
CTS-CAEP Asthma Guidelines
• Systemic corticosteroids:– Recommends SCS to reduce relapse.
• Inhaled corticosteroids:– Recommends ICS to reduce relapse.
• Adjunctive care:– LABA?, close follow-up, asthma education,
smoking cessation, immunizations, AAP.
Hodder R, et al. Can Med Assoc J. 2010
Flow chart - ICS vs ICS/LABA
Emergency DepartmentTreatment
SABA 2 puffs QID + Prednisone 50 mg OD
SABA 2 puffs QID + Prednisone 50 mg OD
R
Visit: 1 Telephone Telephone
Week: 0 10-14 days 4 weeks
Fluticasone 1000ug/Salmeterol per day X 4 weeks
Emergency Department discharge
Fluticasone 1000ug/day X 4 weeks
Rowe BH, et al Acad Emerg Med 2007; 14:833-40.
ADVAIR
FLOVENT
0 7 14 21Time to Relapse (days)
Number at RiskADVAIR
FLOVENT69 61 56 5468 59 55 53
0
10
20
30
40
50
60
70
80
90
100
% R
ela
pse
Fre
eRelapse
Rowe BH, et al Acad Emerg Med 2007; 14:833-40.
05
10
15
20
25
30
% R
ela
pse
N= 37 34 31 34
No ICS ICS
ADVAIRFLOVENT
Relapse by Prior ICS Use
Rowe BH, et al. Acad Emerg Med 2008 (ePub Aug)
Relapse predictors - AIR Sub-Study
• Design: Prospective cohort.• Patients: Consecutive patients with acute asthma
enrolled in ED by trained research nurses at following informed consent.
• Setting: 20 ED sites across Canada (2004-2005)• Assessment: Pre-ED, in-ED and post ED
(discretion of the treating MD) care documented.• Outcome assessment: 2-week telephone contact.• Primary outcome: relapse.
Rowe BH, et al. Acad Emerg Med 2008; 15:709–717
Multi-variate LR relapse model
Summary
• ED visits are common, vary by region and treatment varies.
• In –ED: – SABA/SAAC; SCS; IV MgSO4, ICS and ? NIV.
• Post-discharge:– SCS, ICS +/- LABA
• Follow-ups:– Delays common and methods of “connecting” under
studied.
• Delivery of non-drug treatments important.
Thanks for the invitation!
Questions….?
Mild exacerbation Severe exacerbation
Confirm Diagnosis
Acute Asthma Management – Adults
In-ED management
Fast-acting beta-agonist and ipratropium bromide
Treat complications
Systemic corticosteroid (SCS)
NIV
IV MgSO4, inhaled corticosteroids
Adjust therapy based on history/response
Pre-ED management minimal Pre-ED ICS adherence
Control environment, education, referral(s)
Acute Asthma Management – Adults
Post-ED management
Fast-acting bronchodilator
Written Discharge Plan
Inhaled corticosteroid (ICS)
?
Add a LABA
Systemic corticosteroid (SCS)
Adjust therapy based on severity
/response