Acceleration time ratio for the assessment of extracranial internal carotid artery stenosis.
OBJECTIVE
To apply the acceleration time (AcT) ratio as an additional marker for diagnosing internal carotid artery (ICA) stenosis.


METHODS
Carotid artery sonography was performed in 140 patients, and the AcT ratio was calculated as the AcT of the ICA divided by the AcT of the ipsilateral common carotid artery, and compared with diameter stenosis.


RESULTS
There was a significant correlation between diameter stenosis and the AcT ratio. The receiver operating characteristic curve revealed a cutoff level of 1.5, with 90.0 % sensitivity and 93.5 % specificity for stenosis >65 %.


CONCLUSIONS
Our results indicate that applying the AcT ratio can help in the diagnosis of ICA stenosis.
Stroke Division, Department of Neurology, Dokkyo Medical University, 880 Kitakobayashi, Mibu, Shimotsuga, Tochigi, 321-0293, Japan. htakekawa-jscn@umin.ac.jp.
Hidehiro
H
Takekawa
Department of Neurology, Dokkyo Medical University, Tochigi, Japan.
Keisuke
K
Suzuki
Center of Medical Ultrasonics, Dokkyo Medical University, Tochigi, Japan.
Etsuo
E
Takada
Department of Neurology, Dokkyo Medical University, Tochigi, Japan.
Hideaki
H
Tanaka
Stroke Division, Department of Neurology, Dokkyo Medical University, 880 Kitakobayashi, Mibu, Shimotsuga, Tochigi, 321-0293, Japan.
Ryuta
R
Okabe
Stroke Division, Department of Neurology, Dokkyo Medical University, 880 Kitakobayashi, Mibu, Shimotsuga, Tochigi, 321-0293, Japan.
Masanari
M
Yamamoto
Stroke Division, Department of Neurology, Dokkyo Medical University, 880 Kitakobayashi, Mibu, Shimotsuga, Tochigi, 321-0293, Japan.
Yuko
Y
Ishii
Stroke Division, Department of Neurology, Dokkyo Medical University, 880 Kitakobayashi, Mibu, Shimotsuga, Tochigi, 321-0293, Japan.
Madoka
M
Okamura
Department of Neurology, Dokkyo Medical University, Tochigi, Japan.
Koichi
K
Hirata
Acceleration time ratio; Carotid artery ultrasonography; Internal carotid artery; Stenosis