Sucu Hasan Kamil, Gokmen Metin, Gelal Fazil
Neurosurgery Department, Izmir Atatürk Training and Research Hospital, Izmir/Turkey.
Stroke. 2005 May;36(5):998-1000. doi: 10.1161/01.STR.0000162714.46038.0f. Epub 2005 Apr 7.
A simple estimation method of intracerebral hematoma volume known as XYZ/2 method has been described previously. This method has also been shown to be valid for the estimation of acute subdural hematoma volume. However, chronic subdural hematomas differ in shape and extension from acute subdural hematomas, which makes the validity of the same method in the estimation of hematoma volume questionable. We aimed to determine the value of XYZ/2 method to estimate the volume of chronic subdural hematoma when compared with computer-assisted volumetric analysis.
Computed tomography scans of 28 patients with unilateral hemispheric chronic subdural hematoma were reviewed. Hematoma volumes were measured using 5 different XYZ/2 formulas and compared with volumes measured by computer-assisted analysis. Nonparametric correlation coefficient (Spearman's rho) was used in statistical comparison.
All 5 formulas showed excellent correlation with the gold standard, proving the validity of XYZ/2 method in the estimation of chronic subdural hematoma volume (level of significance <0.001). Our results suggest that maximum hematoma length and width, which are not necessarily on the same slice, should be used rather than length and width of hematoma on the central slice when using XYZ/2 method in patients with chronic subdural hematoma.
This study proves the validity of XYZ/2 technique for the estimation of chronic subdural hematoma volume as well.
之前已描述过一种名为XYZ/2法的简单脑内血肿体积估算方法。该方法也已被证明在估算急性硬膜下血肿体积时是有效的。然而，慢性硬膜下血肿在形状和范围上与急性硬膜下血肿不同，这使得该方法在估算血肿体积时的有效性受到质疑。我们旨在确定与计算机辅助容积分析相比，XYZ/2法在估算慢性硬膜下血肿体积方面的价值。
回顾了28例单侧半球慢性硬膜下血肿患者的计算机断层扫描。使用5种不同的XYZ/2公式测量血肿体积，并与计算机辅助分析测量的体积进行比较。统计比较采用非参数相关系数（Spearman等级相关系数）。
所有5个公式与金标准均显示出极好的相关性，证明了XYZ/2法在估算慢性硬膜下血肿体积方面的有效性（显著性水平<0.001）。我们的结果表明，在对慢性硬膜下血肿患者使用XYZ/2法时，应使用不一定在同一切片上的血肿最大长度和宽度，而不是中央切片上血肿的长度和宽度。
本研究也证明了XYZ/2技术在估算慢性硬膜下血肿体积方面的有效性。
