1,721,033 research outputs found
.: Impaired endothelium-independent vasodilation at peripheral microcirculatory level in hypertensive patients with left ventricular hypertrophy
No full textEpicardial vessel remodeling associated to endurance training in middle-age normal subjects
No full textRelationship between coronary vasodilator capacity and myocardial performance in uncomplicated hypertension
No full textRelazione tra ipertrofia ventricolare sinistra e vasodilatazione microcircolatoria cutanea al Sodio Nitroprussiato in pazienti con ipertensione arteriosa essenziale
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Clinical validation of common carotid artery wall distension assessment based on multigate doppler processing
No full textMechanical properties of human large arteries result from the interaction between blood pressure, wall distensibility and shear stress. Both the arterial diameter changes through the cardiac cycle (distension) and blood flow velocities can be noninvasively investigated through Doppler ultrasound approaches. Recently, an integrated system processing in real-time all the echo signals produced along an M-line has been developed. This system has been so far demonstrated to be suitable for accurate hemodynamic studies through the detection of blood velocity profiles. This paper reports on the extension of its processing capabilities to the real-time measurement of arterial distension. Tissue motion estimation is based on a modified 2-D autocorrelation algorithm. A novel adaptive approach to track wall position over time using the sum of the high-pass filtered displacement waveform and the low-pass filtered wall position is described. By observing the blood velocity profile, a rapid and accurate positioning of the ultrasound probe and an inherent check on perpendicular observation are provided. First clinical results obtained by measuring the distension of common carotid arteries in a group of 41 volunteers are reported and measurements are validated against those provided by a dedicated wall-track reference system. Average measured distension and diameter were 499 ± 188 μm and 6.90 ± 0.66 mm and intraobserver intrasession reproducibility tests showed coefficients of variability of 8.5% and 5.9%, respectively. The agreement between the proposed system and the reference system, expressed as bias ± 2 SD of the differences, was −34 ± 141 μm for distension and 0.05 ± 1.07 mm for diameter
Ridotta risposta vasodilatatrice del microcircolo periferico al Nitroprussiato di Sodio in pazienti con ipertensione arteriosa essenziale ed ipertrofia ventricolare sinistra
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Ridotta risposta vasodilatatrice del microcircolo periferico al Sodio Nitroprussiato in pazienti con ipertensione arteriosa essenziale ed ipertrofia ventricolare sinistra
No full textDiminuita vasodilatazione endotelio-indipendente a livello del microcircolo cutaneo in pazienti ipertesi con ipertrofia ventricolare sinistra o rimodellamento concentrico
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