Safety of regadenoson, a selective adenosine A2A agonist, in patients with chronic obstructive pulmonary disease: A randomized, double-blind, placebo-controlled trial (RegCOPD trial).
BACKGROUND
Patients with reactive airways are at risk for adenosine-induced bronchoconstriction, mediated via A(2B) and/or A(3) adenosine receptors.


RESULTS
In this randomized, double-blind, placebo-controlled crossover trial, we examined the safety of regadenoson, a selective adenosine A(2A) receptor agonist, in patients with moderate chronic obstructive pulmonary disease (COPD) (n = 38) and patients with severe COPD (n = 11) with a baseline mean forced expiratory volume in 1 second (FEV(1)) of 1.74 +/- 0.50 L and 1.0 +/- 0.35 L, respectively, 37% of whom had dyspnea during activities of daily living. Patients receiving glucocorticoids or oxygen and those with pretreatment wheezing were included. Short-acting bronchodilators were withheld for at least 8 hours before treatment. No differences emerged between regadenoson and placebo on multiple lung function parameters, including repeated FEV(1) and forced vital capacity, respiratory rate, pulmonary examinations, and oxygen saturation. The mean maximum decline in FEV(1) was 0.11 +/- 0.02 L and 0.12 +/- 0.02 L (P = .55) in patients after regadenoson and placebo, respectively, and new-onset wheezing was observed in 6% and 12%, respectively (P = .33). No patient required acute treatment with bronchodilators or oxygen.


CONCLUSIONS
This pilot study showed the overall safety of regadenoson in 49 compromised outpatients with clinically stable moderate and severe chronic obstructive pulmonary disease.
Cardiology Division, University of California, Irvine, Irvine, USA. gthomas@mimg.com
Gregory S
GS
Thomas
Bruce R
BR
Tammelin
George L
GL
Schiffman
Rudy
R
Marquez
Deborah L
DL
Rice
Douglas
D
Milikien
Vandana
V
Mathur
D058917:Adenosine A2 Receptor Antagonists; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003324:Coronary Artery Disease / Q000150:complications / Q000175:diagnosis*; D004311:Double-Blind Method; D005080:Exercise Test / Q000009:adverse effects* / Q000379:methods; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010865:Pilot Projects; D015990:Placebo Effect; D029424:Pulmonary Disease, Chronic Obstructive / Q000150:complications / Q000175:diagnosis*; D011687:Purines / Q000008:administration & dosage / Q000009:adverse effects*; D011720:Pyrazoles / Q000008:administration & dosage / Q000009:adverse effects*; D012120:Respiration Disorders / Q000139:chemically induced* / Q000175:diagnosis; D018570:Risk Assessment; D012307:Risk Factors; D016896:Treatment Outcome
D058917:Adenosine A2 Receptor Antagonists; D011687:Purines; D011720:Pyrazoles; C430916:regadenoson