Published online before print June 9, 2003, doi: 10.1161/01.CIR.0000074211.28917.31
(Circulation. 2003;107:3170.)
© 2003 American Heart Association, Inc.
Clinical Investigation and Reports |
Functional Changes in Coronary Microcirculation After Valve Replacement in Patients With Aortic Stenosis
From the Academic Cardiology Unit, St Mary’s Hospital (K.R., D.J.S.); MRC Clinical Sciences Centre, Hammersmith Hospital (K.R., O.E.R., P.G.C.); and Cardiovascular MR Unit, Royal Brompton Hospital, Imperial College School of Medicine and National Heart and Lung Institute (K.R., N.G.B., D.J.P.), London, UK.
Correspondence to Professor Desmond J. Sheridan, Academic Cardiology Unit, St Mary’s Hospital, Division of National Heart and Lung Institute, 10th Floor QEQM Wing, South Wharf Rd, London W2 1NY, UK. E-mail d.sheridan{at}ic.ac.uk
Background— Increased extravascular compression and reduced diastolic perfusion time (DPT), rather than vascular remodeling, influence coronary microcirculatory dysfunction in aortic stenosis (AS). However, alterations after aortic valve replacement (AVR) remain unclear. The aim of the present study was to quantify changes in transmural perfusion and coronary vasodilator reserve (CVR), a measure of microcirculatory function, after AVR and determine the relative contribution of left ventricular mass (LVM) regression, change in aortic valve area (AVA), and DPT.
Methods and Results— Twenty-two patients with AS were studied before and 1 year after AVR using echocardiography to measure AVA, cardiovascular magnetic resonance to assess LVM, and positron emission tomography to quantify resting and hyperemic myocardial blood flow (MBF) and CVR. Regression of LVM occurred in all patients (from 129±30 to 94±24 g/m2; P<0.0001), and there was a significant reduction in resting MBF and increase in CVR corrected for rate-pressure product after AVR, although these changes displayed marked heterogeneity. Regression of LVM was linearly related to change in resting total LV blood flow but not CVR. Increase in hyperemic MBF and CVR transmurally was directly related to the increase in AVA after AVR. A significant relationship existed between the change in hyperemic DPT (1.0±4.7 s/min [range, 6.8 to 9.6]) and change in transmural CVR (y=0.08x+0.18; r=0.44; P=0.04).
Conclusions— Changes in coronary microcirculatory function in patients with AS after AVR are not directly dependent on regression of LVM. Reduced extravascular compression and increased DPT are proposed as the main mechanisms for improvement in MBF and CVR after AVR.
Key Words: valves • microcirculation • surgery • hypertrophy • regression
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