Sonographic Evaluation of Carotid Impedance of Stroke Patients
Date Issued
1999-07-31
Date
1999-07-31
Author(s)
謝正宜
DOI
882314B002285
Abstract
Vascular impedance that describes the
spectral relationship of blood pressure and
flow is an important index for vascular load
downstream. In this study, clinical ultrasound
was used to develop a non-invasive technique
for measuring diameter pulsation. By
coupling with Doppler velocimetry, the
vascular impedance can be calculated.
Since the central artery is nearly elastic, the
blood pressure is directly related to the
change of diameter. For the peripheral
arteries, the palpating pressure is recorded to
account for the vascular visco-elasticity. In
the study of vascular impedance at the
common carotid artery (CCA), we found the
abnormal side of stroke patients with oneside
occlusion had a higher mean resistance
than the normal side and their vascular
impedance at frequencies above the fourth
harmonic increased. For patients with oneside
hemorrhagic infarction, both-sides of
their CCA impedance increased at lower
frequencies indicating higher afterload.
Subjects
Stroke
Ultrasound
Vascular
impedance
Publisher
臺北市：國立臺灣大學醫學院復健科
Type
other
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