Wanitwattanarumlug Boontaree, Varavithya Vithya
Department of Radiology, Faculty of Medicine, Srinakharinwirot University, Nakhon Nayok, Thailand.
J Med Assoc Thai. 2012 Dec;95 Suppl 12:S21-5.
The diagnosis of carpal tunnel syndrome (CTS) is usually based on clinical combining with nerve conductive study (NCS). Recently, ultrasound (US) is the choice for investigation of median nerve morphology and size. The advantages of US are non-invasive in nature and no discomfort or pain. Data on median nerve cross sectional area (CSA) in healthy Thai subjects are still limited.
To know the mean value of normal CSA in healthy Thai population. Is it different from the other countries?
Thai populations, without clinical sign or symptom of CTS, were included in the present study. A linear array transducer was used to scan and measure median nerve cross-sectional area and the maximum transverse and anteroposterior diameter were recorded.
Eighty-eight wrists of 44 asymptomatic of CTS and healthy Thai volunteer were examined with US. The mean CSA measurement were found as 6.83 +/- 0.98 mm2 by tracing method (TM) and 6.81 +/- 1.12 mm2 by ellipsoid formula (EF) method. No significant differentiation was observed between CSA calculated using TM and EF of median nerve. There was no significant difference in CSA between right and left hand or dominate and non-dominate hand. CSA calculated by the TM and EF method were found to be significantly larger in male than in female. There was no correlation between CSA and age or BMI.
Although body habitus of people was different among countries, the mean CSA of median nerve in healthy people are not significantly difference.
腕管综合征（CTS）的诊断通常基于临床症状并结合神经传导研究（NCS）。近年来，超声（US）已成为研究正中神经形态和大小的首选方法。超声的优点是无创，不会引起不适或疼痛。泰国健康人群正中神经横截面积（CSA）的数据仍然有限。
了解泰国健康人群正常CSA的平均值。它与其他国家有差异吗？
本研究纳入无CTS临床症状或体征的泰国人群。使用线阵换能器进行扫描，测量正中神经横截面积，并记录最大横径和前后径。
对44名无CTS症状的健康泰国志愿者的88只手腕进行了超声检查。通过追踪法（TM）测得的平均CSA为6.83±0.98mm²，通过椭圆公式（EF）法测得的平均CSA为6.81±1.12mm²。使用TM和EF计算的正中神经CSA之间未观察到显著差异。右手和左手或优势手和非优势手之间的CSA无显著差异。通过TM和EF法计算的CSA在男性中显著大于女性。CSA与年龄或BMI之间无相关性。
尽管不同国家人群的体型不同，但健康人群正中神经的平均CSA无显著差异。
