AIMS A ratio of distal renal pressure to aortic pressure (P(d)/P(a)) <0.90 can be considered a threshold for defining a significant renal artery stenosis (RAS). The aim of this study was to compare renal angiography (QRA) and colour duplex ultrasound (CDUS) to pressure measurements in assessing RAS. METHODS AND RESULTS In 56 RAS, percent diameter stenosis (DS(angio)), minimal luminal diameter...

Background. Three important determinants of left ventricular (LV) peak early diastolic filling rate, which is related directly to the magnitude of the transmitral pressure difference, are the rate of LV isovolumic pressure fall (T1/2), left atrial (LA) pressure at mitral valve opening (XI), and end-systolic volume (ESV). Methods and Results. To delineate the relative degrees to which these fact...

BACKGROUND Three important determinants of left ventricular (LV) peak early diastolic filling rate, which is related directly to the magnitude of the transmitral pressure difference, are the rate of LV isovolumic pressure fall (T1/2), left atrial (LA) pressure at mitral valve opening (X1), and end-systolic volume (ESV). METHODS AND RESULTS To delineate the relative degrees to which these fact...

INTRODUCTION An altered perfusion of the optic nerve head has been proposed as a pathogenic factor in glaucoma. OBJECTIVE To evaluate changes of haemodynamic parameters in the retrobulbar arterial circulation after a decrease of elevated intraocular pressure (IOP) in patients with primary open angle glaucoma (POAG). METHODS Twenty-six patients were examined, 14 men and 12 women, 21 up to 50...

BACKGROUND AND PURPOSE In severe carotid stenosis, blood supply via the poststenotic internal carotid artery (ICA) and collateral pathways determine cerebral perfusion. We investigated whether poststenotic flow on transoral carotid ultrasonography (TOCU) is predictive of cerebral hemodynamics. METHODS Eighty-eight patients with unilateral carotid stenosis underwent TOCU to analyze blood flow ...

Aims: To compare retrobulbar hemodynamic measured by colour Doppler imaging (CDI) in patients with a different severity of glaucoma and to correlate variables CDI the structural parameters retina optic disc.Material methods: Of 89 eyes studied, 31 had preperimetric, 29 early, 12 moderate 17 advanced glaucoma. Peak systolic velocity (PSV), end-diastolic (EDV), resistance index (RI) ophthalmic ar...

To assess left ventricular (LV) diastolic filling at rest in patients with coronary artery disease (CAD), we analyzed high-resolution time-activity curves (10-20 msec/frame) obtained from gated radionuclide angiograms in 231 patients. Peak LV filling rate (PFR), expressed in end-diastolic volumes per second (EDV/sec), was subnormal in CAD patients (1.8 +/- 0.6 [+/- SD] vs normal mean of 3.3 +/-...

Purpose Ischemic ocular disorders may be treated by hypervolemic hemodilution. The presumed therapeutic benefit is based on a volume effect and improved rheological factors. The aim was to investigate the acute effect of intravenous hydroxyethyl starch on retrobulbar hemodynamics in patients with nonarteritic anterior ischemic optic neuropathy (NAION). Methods 24 patients with acute NAION wer...

introduction: we aimed to assess whether the vasodilator effect of oral dipyridamole on the left ventricular systolic function in patients with suspected cad is different from that of intravenous (iv) dipyridamole using tc-99m mibi myocardial perfusion gated spect. methods: eighty-nine patients (17 m / 72 w; 61 ± 10 years) were enrolled in this study. the patients underwent a dipyridamole stres...

HYPOTHESIS Marked peripheral vasodilation and rubor characterize critically ischemic limbs on dependency. We believe that intermittent claudication is also associated with peripheral hemodynamic changes on postural alteration, which differ distinctly from normal. Evaluation of such differences and understanding of the underlying physiological derangements may be essential in the development of ...