Correlation between the degree of left subclavian artery stenosis and the left vertebral artery waveform by pulse Doppler ultrasonography.
BACKGROUND
Development of retrograde blood flow may be observed in the vertebral artery and is associated with progressive ipsilateral proximal subclavian or innominate artery stenosis. The subclavian steal phenomenon is more prevalent in the left subclavian artery (LSA). The purpose of this study was to analyze the correlation between the degree of LSA stenosis and pulse Doppler waveforms of the left vertebral artery (LVA).


METHODS
A retrospective analysis of LVA waveforms was performed in 22 cases with LSA proximal stenosis before the origin of the LVA in conventional angiograms. The degree of LSA stenosis was classified into 5 groups (<50, 50-59, 60-69, 70-89, 90-100%). Pulse Doppler waveforms of the LVA were also classified into 5 subtypes depending on the depth of the mid-systolic notch representing retrograde blood flow (normal, mid-systolic notch, retrograde flow smaller than antegrade flow, retrograde flow larger than antegrade flow, retrograde flow without antegrade flow).


RESULTS
A statistically significant correlation (R(2) = 0.646, p < 0.0001) was found between the degree of LSA stenosis and the LVA waveform.


CONCLUSIONS
The pattern analysis of LVA pulse Doppler waveforms seems to be useful in determining the degree of LSA stenosis.
Department of Cerebrovascular Disease, Clinical Research Institute, National Kyushu Medical Center, Fukuoka, Japan. sakima51@gmail.com
Hirokuni
H
Sakima
Yoshiyuki
Y
Wakugawa
Katsunori
K
Isa
Masahiro
M
Yasaka
Toshiyasu
T
Ogata
Masaki
M
Saitoh
Hiroshi
H
Shimada
Kotaro
K
Yasumori
Tooru
T
Inoue
Yusuke
Y
Ohya
Yasushi
Y
Okada
D000368:Aged; D015901:Angiography, Digital Subtraction; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D011237:Predictive Value of Tests; D012039:Regional Blood Flow; D012189:Retrospective Studies; D012720:Severity of Illness Index; D013349:Subclavian Steal Syndrome / Q000000981:diagnostic imaging* / Q000503:physiopathology; D018617:Ultrasonography, Doppler, Pulsed; D014711:Vertebral Artery / Q000000981:diagnostic imaging* / Q000503:physiopathology