Objective: Measurement of arterial stiffness is becoming widely used for assessing cardiovascular risk and target organ damage. Two commercially available ultrasound systems (QAS, Esaote, Italy and eTracking, Aloka, Japan) provide radio-frequency (RF)-based tracking of carotid wall, thus allowing automatic accurate real-time determination of vessel diameter and distension, and subsequent calculation of indices of carotid stiffness. The measurement is performed in a single line by eTracking and in 16 equidistant lines within the region of interest by QAS. Aim of the present study was to evaluate whether the measures of carotid stiffness obtained by the two systems are interchangeable, and to assess the intra- and inter-operator variability of acquisitions. Design and methods: In the same session, MyLab 70 (Esaote, Italy) and Alpha 7 (Aloka, Japan) were used in random order to measure (2 cm before the flow divider) right common carotid artery (CCA) diameter and distension, and to calculate beta-index (Beta) in 104 subjects divided into 4 groups: 24 healthy controls (NL, age 32±7 yy), 24 prehypertensive subjects (PHBP, age 50±10 yy), 26 hypertensive patients (HBP, age 57±10 yy) and 27 type 2 diabetic patients (DM, age 62±6 yy). In 30 subjects, the second acquisition was performed after a 60-minute interval, both by the same operator and by a second operator. The reported values represent a mean of 3 measurements. Results: Brachial BP was similar during the acquisition with QAS and eTracking (p0.94), and the correlation between the two systems for CCA distension and Beta was high (r0.94 and 0.90, respectively,.......
COMPARISON OF TWO RADIO-FREQUENCY BASED ULTRASOUND SYSTEMS FOR ASSESSMENT OF CAROTID STIFFNESS
PALOMBO, CARLO;DI BELLO, VITANTONIO;BALBARINI, ALBERTO
2011-01-01
Abstract
Objective: Measurement of arterial stiffness is becoming widely used for assessing cardiovascular risk and target organ damage. Two commercially available ultrasound systems (QAS, Esaote, Italy and eTracking, Aloka, Japan) provide radio-frequency (RF)-based tracking of carotid wall, thus allowing automatic accurate real-time determination of vessel diameter and distension, and subsequent calculation of indices of carotid stiffness. The measurement is performed in a single line by eTracking and in 16 equidistant lines within the region of interest by QAS. Aim of the present study was to evaluate whether the measures of carotid stiffness obtained by the two systems are interchangeable, and to assess the intra- and inter-operator variability of acquisitions. Design and methods: In the same session, MyLab 70 (Esaote, Italy) and Alpha 7 (Aloka, Japan) were used in random order to measure (2 cm before the flow divider) right common carotid artery (CCA) diameter and distension, and to calculate beta-index (Beta) in 104 subjects divided into 4 groups: 24 healthy controls (NL, age 32±7 yy), 24 prehypertensive subjects (PHBP, age 50±10 yy), 26 hypertensive patients (HBP, age 57±10 yy) and 27 type 2 diabetic patients (DM, age 62±6 yy). In 30 subjects, the second acquisition was performed after a 60-minute interval, both by the same operator and by a second operator. The reported values represent a mean of 3 measurements. Results: Brachial BP was similar during the acquisition with QAS and eTracking (p0.94), and the correlation between the two systems for CCA distension and Beta was high (r0.94 and 0.90, respectively,.......I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
