Hui, D., Kilgore, K., Frisbee-Hume, S., Park, M., Tsao, A., Delgado Guay, M., . . . Bruera, E. (2016). Dexamethasone for dyspnea in cancer patients: A pilot double-blind, randomized, controlled trial. Journal of Pain and Symptom Management, 52, 8-16.e1
To determine the feasibility of conducting a randomized trial of dexamethasone in patients with cancer and the estimated efficacy of dexamethasone in the treatment of dyspnea.
Patients were randomly assigned to a 1:1 ratio to receive either dexamethasone 8 mg (two capsules of 4 mg) orally twice a day for four days, then 4 mg given orally twice a days for three days or identical-appearing placebo capsules. After one week, patients received dexamethasone 4 mg orally twice a day for seven days in open-label fashion.
Double-blind, parallel, placebo-controlled, randomized trial
Dyspnea was assessed at baseline, day 4+ or -2, day 7+ or -2, and day 14+ or -2. The Edmonton Symptom Assessment System (ESAS) was used. Dyspnea “now” was assessed using the Modified Dyspnea Borg Scale. The Cancer Dyspnea Scale as well as the European Organisation for Research and Treatment of Cancer Quality of Life Questionnaire-Core 30 (EORTC-C30) was used. MicroLoop Spirometer was used at baseline to obtain FEV1, FVC, FEV1/FEV2, peak inspiratory flow, and peak expiratory flow. Patients used the portable Microlife PF 100 Peak Flow Meter daily to measure peak flow and FEV1. A priori was considered that the study was feasible if at least 50% of patient completed the study. Twenty patients per arm provided 80% power to detect an effect size as small as 0.66 within arms with a two-tailed alpha of 0.05. To estimate effect size, the within-arm mean differences between baseline and day 4, 7, and 14 along with the 95% CI for dyspnea was determine and applied the Wilcoxon signed-rank test. The Statistical Analysis System was used for statistical analysis.
Dexamethasone was associated with a significant reduction in ESAS dyspnea NRS of -1.9 (p = 0.01) by day 4 and -1.8 (p = 0.02) by day 7. Placebo was associated with a reduction of -0.7 (p = 0.38) by day 4 and -1.3 (p = 0.03) by day 7. After one week of open-label treatment, both arms had improvement in dyspnea by day 14 (p = 0.01 for dexamethasone, placebo p = 0.004). The dyspnea numeric scale showed similar results by day 14. EORTC showed improvements in dyspnea in the dexamethasone arm by day 4 (p = 0.04). ESAS drowsiness improved in the dexamethasone arm by day 4 (p = 0.03) and day 7 (p = 0.01), but not by day 14; however, baseline drowsiness was higher in the dexamethasone arm. Dexamethasone was well-tolerated with no grade 3 toxicities.
Dexamethasone showed to improve dyspnea with minimal adverse effects. Feasibility of a randomized controlled trial without unacceptable attrition was validated. More testing needs to be completed to determine absolute efficacy.
Nurses may consider using corticosteroids management of dyspnea for patients with severe dyspnea when no obvious reversible etiologies and targeted interventions exist. Nurses need to be aware of the potential adverse reactions associated with corticosteroids and educate patients on such. Nurses need to be aware of the various routes of administration for corticosteroids.