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. 2018 Mar 19;2018(3):CD006897. doi: 10.1002/14651858.CD006897.pub4
Database Search
EMBASE.com
(with RCT and humans as limits)
*steroid* or *corticoid* or "adrenal cortex hormone*" or
 beclomethasone or  betamethasone or cortisone or deflazacort or
 dexamethasone or fluticasone or hydrocortisone or methylprednisolone
 or methylprednisolone or prednis* or pregnenediones or sterapred or
 triamcinolone AND exacerb* or acute* or status* or sever* or wors* or
 emergenc* or attack* or crisis
Medline via PubMed #1 COPD[MeSH Terms]
 #2 "adrenal cortex hormone*"
 #3 steroid
 #4 steroids
 #5 glucocorticoid*
 #6 corticoid*
 #7 corticosteroid*
 #8 beclomethasone
 #9 betamethasone
 #10 fluticasone
 #11 cortisone
 #12 dexamethasone
 #13 hydrocortisone
 #14 prednisolone
 #15 prednisone
 #16 methylprednisolone
 #17 methylprednisone
 #18 triamcinolone
 #19 (#2 OR #3 OR #4 OR #5 OR #6 OR #7 OR #8 OR #9 OR #10 OR #11 OR #12 OR #13 OR #14 OR #15 OR #16 OR #17 OR #18)
 #20 randomised controlled trial [pt]
 #21 controlled clinical trial [pt]
 #22 randomised [tiab]
 #23 placebo [tiab]
 #24 clinical trials as topic [mesh: noexp]
 #25 randomly [tiab]
 #26 trial [ti]
 #27 (#20 OR #21 OR #22 OR #23 OR #24 OR #25 OR #26)
 #28 (animals [mh] NOT humans [mh])
 #29 (#27 NOT #28)
 #30 ("2012/01/01"[Date ‐ Publication] : "3000"[Date ‐ Publication])
 #31 (#1 AND #19 AND #29 AND #30)
ClinicalTrials.gov steroid AND exacerbation AND COPD
Current controlled trials steroid* AND exacerb* AND COPD
CINAHL (with RCTs and humans as limits) COPD or COAD or emphysema* or chronic bronchitis*
AND
*steroid* or corticosteroid* or glucocorticoid* or corticoid* or
"adrenal cortex hormone*" or beclomethasone or  betamethasone or
cortisone or deflazacort or dexamethasone or fluticasone or
hydrocortisone or methylprednisolone or methylprednisolone or prednis*
or pregnenediones or sterapred or triamcinolone
AND (exacerb* or
acute* or status* or sever* or wors* or emergenc* or attack* or
crisis)
AND date restriction 2009‐2010 
Australia New Zealand Clinical Trials Registry COPD AND exacerb*
CENTRAL (the Cochrane Library) *steroid* or corticosteroid* or glucocorticoid* or corticoid* or
 "adrenal cortex hormone*" or beclomethasone or betamethasone or
 cortisone or deflazacort or dexamethasone or fluticasone or
 hydrocortisone or methylprednisolone or methylprednisolone or prednis*
 or pregnenediones or sterapred or triamcinolone AND (exacerb* or
 acute* or status* or sever* or wors* or emergenc* or attack* or
 crisis)
Cochrane Airways Group Register of Trials (via CRS Web) #1 MeSH DESCRIPTOR Pulmonary Disease, Chronic Obstructive Explode All 
 #2 MeSH DESCRIPTOR Bronchitis, Chronic 
 #3 (obstruct*) near3 (pulmonary or lung* or airway* or airflow* or bronch* or respirat*) 
 #4 COPD:MISC1 
 #5 (COPD OR COAD OR COBD):TI,AB,KW 
 #6 #1 OR #2 OR #3 OR #4 OR #5 
 #7 MeSH DESCRIPTOR Adrenal Cortex Hormones Explode All 
 #8 MeSH DESCRIPTOR Adrenal Cortex Hormones Explode All 
 #9 steroid* or corticosteroid* or corticoid* 
 #10 beclomethasone 
 #11 betamethasone 
 #12 cortisone 
 #13 deflazacort 
 #14 dexamethasone 
 #15 fluticasone 
 #16 hydrocortisone 
 #17 methylprednisolone 
 #18 methylprednisone 
 #19 prednis* 
 #20 pregnenediones 
 #21 sterapred 
 #22 triamcinolone 
 #23 MeSH DESCRIPTOR Acute Disease 
 #24 exacerb* or acute* or sever* or wors* or emergenc* or attack* or crisis 
 #25 #7 or #8 or #9 or #10 or #11 or #12 or #13 or #14 or #15 or #16 or #17 or #18 or #19 or #20 or #21 or #22 
 #26 #23 or #24 
 #27 #6 and #25 and #26