Circulation. 2001;104:2401-2406
doi: 10.1161/hc4501.099316
doi: 10.1161/hc4501.099316
(Circulation. 2001;104:2401.)
© 2001 American Heart Association, Inc.
Clinical Investigation and Reports |
Abnormal Epicardial Coronary Resistance in Patients With Diffuse Atherosclerosis but "Normal" Coronary Angiography
From the Cardiovascular Center Aalst (B.D.B., J.B., G.R.H., W.W.), Aalst, Belgium; the Catharina Hospital (F.H., J.W.B., N.H.J.P.), Eindhoven, the Netherlands; and the University of Texas Medical School (K.L.G.), Houston.
Correspondence to Bernard De Bruyne, MD, PhD, Cardiovascular Center, Aalst, Moorselbaan 164, B-9300 Aalst, Belgium. E-mail bernard.de.bruyne{at}olvz-aalst.be
Background— Coronary arteries without focal stenosis at angiography are generally considered non–flow-limiting. However, atherosclerosis is a diffuse process that often remains invisible at angiography. Accordingly, we hypothesized that in patients with coronary artery disease, nonstenotic coronary arteries induce a decrease in pressure along their length due to diffuse coronary atherosclerosis.
Methods and Results— Coronary pressure and fractional flow reserve (FFR), as indices of coronary conductance, were obtained from 37 arteries in 10 individuals without atherosclerosis (group I) and from 106 nonstenotic arteries in 62 patients with arteriographic stenoses in another coronary artery (group II). In group I, the pressure gradient between aorta and distal coronary artery was minimal at rest (1±1 mm Hg) and during maximal hyperemia (3±3 mm Hg). Corresponding values were significantly larger in group II (5±4 mm Hg and 10±8 mm Hg, respectively; both P<0.001). The FFR was near unity (0.97±0.02; range, 0.92 to 1) in group I, indicating no resistance to flow in truly normal coronary arteries, but it was significantly lower (0.89±0.08; range, 0.69 to 1) in group II, indicating a higher resistance to flow. In 57% of arteries in group II, FFR was lower than the lowest value in group I. In 8% of arteries in group II, FFR was <0.75, the threshold for inducible ischemia.
Conclusion— Diffuse coronary atherosclerosis without focal stenosis at angiography causes a graded, continuous pressure fall along arterial length. This resistance to flow contributes to myocardial ischemia and has consequences for decision-making during percutaneous coronary interventions.
Key Words: blood flow • pressure • coronary disease • atherosclerosis • angina • ischemia
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