(Circulation. 2000;101:318.)
© 2000 American Heart Association, Inc.
Basic Science Reports |
From the Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, Calif.
BackgroundMeasurements of Doppler derived coronary flow reserve (CFR) and pressure derived fractional flow reserve (FFR) for coronary stenosis assessment depend on the induction of maximal hyperemia. Adenosine is the most widely used pharmacological agent but is expensive and poorly tolerated by some patients.
Methods and ResultsThe objective of this study was to test the equivalency of adenosine 5'-triphosphate (ATP) to adenosine in their ability to cause maximal hyperemia as compared with the hyperemic response of complete coronary occlusion in 6 canines. Intracoronary administration of either ATP or adenosine resulted in a significant increase in CFR (2.79±0.64 and 2.22±0.7 for 10 µg versus 4.65±1.22 and 4.25±0.78 for 100 µg for ATP and adenosine, respectively, P for trend <0.001) but not reaching the level of coronary occlusion (6.35±2.26). Additionally, FFR and CFR were measured in 35 different stenoses using ATP, adenosine, and coronary occlusion. There was an excellent linear correlation between ATP and adenosine for both CFR (R=0.934, P<0.001) and FFR (R=0.985, P<0.001). However, hyperemia with either ATP or adenosine was less than postocclusion hyperemia, resulting in significantly different reserve measurements (CFR: 1.93±0.66 and 2.08±0.81 versus 2.35±0.97, P<0.001; FFR: 0.62±0.24 and 0.63±0.23 versus 0.58±0.2, P<0.001).
Conclusions1) Step up in dosage of ATP and adenosine beyond currently recommended clinical doses resulted in a significant increase in coronary hyperemia; 2) ATP was equivalent to adenosine for both CFR and FFR; and 3) complete coronary occlusion yielded a better hyperemic response than either drug, indicating that maximal hyperemia was not achieved by either pharmacological stimulus.
Key Words: adenosine coronary disease pressure stenosis
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