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Figure 2 Intra-coronary pressure and coronary fractional flow reserve in a 6-year-old boy. There were two aneurysms at segments 5 and 6 and 90% stenosis between the aneurysms and myocardial ischemia in the antero-septal region. A guiding catheter was advanced into the ostium of the coronary artery, and pressure was then measured (Pa). To measure Pd, we used a 0.014-inch pressure monitoring wire. The wire was advanced into the coronary artery, positioned across the stenotic lesion, to measure intra-coronary pressure (Pd). After these pressure measurements had stabilized, maximum coronary hyperemia was induced by intravenous infusion of papaverine hydrochloride. In this case, myocardial fractional flow reserve (FFRmyo) was calculated from simultaneously recorded values of Pa, Pd, and Pv (mean right atrial pressure) at steady-state maximum hyperemia. The Pd, Pa, and Pv values were 3 mm Hg, 45 mm Hg, and 68 mm Hg, and FFRmyo was 0.65.
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