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J Korean Neurol Assoc. 2014;32(1):8-13.
- Feasibility of 1.6-MHz Probe for Detection of Cerebral Blood Flow in
the Poor Temporal Window
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Moon Kyoung Ahn
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Department of Neurology, Ajou University School of Medicine, Suwon, Korea
- 불량측두창에서 대뇌혈류탐색을 위한 1.6-MHz 탐침의
유용성
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안문경, 이진수 홍지만
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아주대학교 의과대학 신경과학교실
- Abstract
- Background
The demographics of the stroke population consist mainly of elderly patients. Transcranial Doppler is an
effective method for intracranial flow detection, but can be limited due to the poor temporal window (PTW), which is
frequent in the elderly. Therefore, we investigated whether the low frequency 1.6-MHz probe can be useful to improve
flow detection for PTW.
Methods
All 201 participants had a history of transient ischemic attack or minor ischemic stroke. Firstly, we analyzed the
success rate of recording intracranial blood flow via temporal window by using 2.0-MHz (high frequency, HF) and
1.6-MHz (low frequency, LF) probes for a maximum of 10 minutes. Secondly, mean flow velocity (MFV) and pulsatile
index (PI) of insonated spectrum of 25 patients with good temporal window were compared between the two probes.
Results
Seventy-eight patients were female and the mean age was 64.1±12.4 years. Among 402 windows, 125 (31.1%)
were undetected when using the 2.0-MHz probe. Fifty-five patients were detected for the spectrum by the 1.6-MHz
probe. However, 70 (17.4%) still remained as PTW. Between the two probes, there were no significant differences of
variables from the middle cerebral arteries: MFVs (HF 61.0±14.1 vs. LF 61.3±14.8 cm/sec, p=0.403 in the right; HF
59.6±13.4 vs. LF 59.3±13.3 cm/sec, p=0.232 in the left) and PIs (HF 0.82±0.17 vs. LF 0.82±0.18, p=0.929 in the right; HF
0.82±0.20 vs. LF 0.83±0.17, p=0.605 in the left).
Conclusions
Conventional 2.0-MHz probe had relatively high proportion of PTW but 1.6- MHz probe was feasible to
improve flow detection for PTW. Key Words: Cerebral arteries, Temporal bone, Transcranial doppler sonography
Keywords :
- 초록
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