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Renal fractional flow reserve: A hemodynamic evaluation of moderate renal artery stenoses
Author(s) -
Subramanian Rajesh,
White Christopher J.,
Rosenfield Kenneth,
Bashir Riyaz,
Almagor Yaron,
Meerkin David,
Shalman Evgeny
Publication year - 2005
Publication title -
catheterization and cardiovascular interventions
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.988
H-Index - 116
eISSN - 1522-726X
pISSN - 1522-1946
DOI - 10.1002/ccd.20318
Subject(s) - medicine , fractional flow reserve , cardiology , renal artery stenosis , hemodynamics , renovascular hypertension , renal artery , stenosis , pressure gradient , blood pressure , renal artery obstruction , angiography , renal circulation , kidney , renal blood flow , coronary angiography , myocardial infarction , physics , mechanics
The objective of this study was to perform a hemodynamic evaluation of moderate (50–90%) renal artery stenosis (RAS) under conditions of rest and maximum hyperemia. Identifying patients with RAS who have hemodynamically significant stenoses and are most likely to benefit from revascularization is clinically important. Current methods used to evaluate RAS, including angiography, have limitations. Physiologic evaluation of RAS may have a role in identifying patients with hemodynamically significant stenosis. Patients with suspected renovascular hypertension due to aorto‐ostial RAS were included in the study. Hyperemia was induced by administration of intrarenal papavarine. Translesional pressure gradients were measured and renal fractional flow reserve (FFR) was calculated using a 0.014″ pressure guidewire. Thirteen patients and 14 arteries with moderately severe (50–90%) RAS were studied. The mean translesional pressure gradient rose from a baseline of 6.3 ± 3.9 to 17.5 ± 10.8 mm Hg with maximal hyperemia. The renal FFR ranged from 0.58 to 0.95. There was a poor correlation between angiographic stenosis measurement and the renal FFR (r = −0.18; P = 0.54) and the hyperemic translesional mean pressure gradient (r = 0.22; P = 0.44). There was an excellent correlation between renal FFR and the resting mean translesional pressure gradient (r = −0.76; P = 0.0016) and the hyperemic mean translesional pressure gradient (r = −0.94; P < 0.0001). Selective renal arterial papavarine administration induces maximum hyperemia, permitting the calculation of renal FFR in renal arteries with aorto‐ostial stenoses. The renal FFR correlates well with other hemodynamic parameters of lesion severity, but poorly with angiographic measures of lesion severity. Catheter Cardiovasc Interv 2005;64:480–486. © 2005 Wiley‐Liss, Inc.