Abstract:
OBJECTIVE:This study compared quantitatively the efficacy of intravenous adenosine and dipyridamole for pharmacologic induction of myocardial hyperemia. BACKGROUND:Pharmacologic vasodilation is used increasingly for induction of myocardial hyperemia in conjunction with radionuclide imaging of myocardial blood flow. Although both intravenous dipyridamole and adenosine have been used, the magnitude of hyperemia induced by these agents and the hyperemia to baseline blood flow ratios have not been quantified and compared. METHODS:Twenty normal volunteers were studied with dynamic positron emission tomography (PET) and intravenous nitrogen-13 ammonia. Myocardial blood flow was quantified with a two-compartment tracer kinetic model. RESULTS:Myocardial blood flow at rest averaged 1.1 +/- 0.2 ml/min per g and increased significantly to 4.4 +/- 0.9 ml/min per g during adenosine and 4.3 +/- 1.3 ml/min per g after dipyridamole administration. Hyperemia to baseline flow ratios averaged 4.3 +/- 1.6 for adenosine and 4.0 +/- 1.3 for dipyridamole. The average flow ratios and the maximal flows achieved were similar for both agents, but there was considerable variation in the individual response to these agents, as indicated by the range of hyperemia to baseline flow ratios (from 2.0 to 8.4 for adenosine and from 1.5 to 5.8 for dipyridamole). In addition, the hyperemic responses to dipyridamole and to adenosine differed by greater than 1 ml/min per g in nine subjects. CONCLUSIONS:Despite these inter- and intraindividual differences, we conclude that both agents are equally effective in producing myocardial hyperemia.
journal_name
J Am Coll Cardioljournal_title
Journal of the American College of Cardiologyauthors
Chan SY,Brunken RC,Czernin J,Porenta G,Kuhle W,Krivokapich J,Phelps ME,Schelbert HRdoi
10.1016/0735-1097(92)90201-wsubject
Has Abstractpub_date
1992-10-01 00:00:00pages
979-85issue
4eissn
0735-1097issn
1558-3597pii
0735-1097(92)90201-Wjournal_volume
20pub_type
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