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MedLine Citation:
PMID:  22718059     Owner:  NLM     Status:  In-Data-Review    
Single-photon emission computerized tomography for myocardial perfusion imaging (MPI) is a non-invasive technique. MPI is performed by subjecting the patient to exercise or by using a pharmacological stress agent. Regadenoson is a selective A 2A adenosine receptor agonist used when MPI with exercise is contraindicated. It binds to the A 2A receptor and stimulates adenylate cyclase, resulting in increased cAMP, which phosphorylates protein kinase A thereby opening the ATP-dependant potassium channels leading to hyperpolarization in the coronary vascular smooth muscle. After a single bolus dose of regadenoson 400 μg, a peak plasma concentration (C max ) of 13.6 ng/mL is attained in 1-4 min, with a terminal half-life of 2 h. It has a quick onset, short duration sufficient enough for hyperemic response, with comparable efficacy to adenosine, but with fewer side-effects. The adverse effects of this drug are dyspnea, headache, flushing, chest pain and atrioventricular block. Regadenoson is used for MPI in patients with co-morbid conditions like mild-to-moderate reactive airway disease, obstructive lung disease and renal impairment.
G M Bengalorkar; K Bhuvana; N Sarala; T N Kumar
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of postgraduate medicine     Volume:  58     ISSN:  0022-3859     ISO Abbreviation:  J Postgrad Med     Publication Date:  2012 Apr 
Date Detail:
Created Date:  2012-06-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2985196R     Medline TA:  J Postgrad Med     Country:  India    
Other Details:
Languages:  eng     Pagination:  140-6     Citation Subset:  IM    
Department of Pharmacology, Sri Devaraj Urs Medical College, Tamaka, Kolar, Karnataka, India.
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