Sun Tsim Christopher, Schier Mara, Lau Michelle Pui Yan, Martinez-Taboada Fernando
Sydney School of Veterinary Science, University of Sydney, Camperdown, NSW 2050, Australia.
Animals (Basel). 2021 Oct 15;11(10):2974. doi: 10.3390/ani11102974.
This study aimed to validate previously published computed tomography (CT) derived mathematical equations with the true skin to lumbosacral epidural distance (SLED) in dog cadavers. Phase 1: The lumbar region of 11 dog cadavers were scanned in sternal recumbency to determine the effect of cranial, neutral, and caudal pelvic limb positioning on the CT derived lumbosacral epidural distance (CLED). Phase 2: The epidural space was determined using contrast epidurography, and the SLED was analysed against the mathematical equations using a body condition score (BCS) and either the cadaveric occipital-coccygeal length (OCL) (Equation (1): = 7.3 + 0.05OCL + 16.45BCS) or the ilium wing distance (IWD) (Equation (2): = 3.5 + 0.56IWD + 16.6BCS). There were no differences detected between the pelvic limb positions and the CLED. Both equations demonstrated strong correlations (Equation (1): = 0.7196; Equation (2): = 0.7590) with the SLED. The level of agreement was greater for Equation (1) than with Equation (2) (concordance coefficient 0.6061 and 0.3752, respectively). Equation (1) also demonstrated a closer fit to the concordance line compared with Equation (2) (bias correction factor 0.8422 and 0.4960, respectively). Further studies in live anaesthetised dogs will help to determine the usefulness of the pre-procedural knowledge when performing lumbosacral epidurals.
本研究旨在通过犬类尸体中真实的皮肤至腰骶部硬膜外间隙距离（SLED）来验证先前发表的基于计算机断层扫描（CT）得出的数学公式。第一阶段：对11具犬类尸体的腰椎区域进行仰卧位扫描，以确定颅侧、中立位和尾侧骨盆肢体位置对CT得出的腰骶部硬膜外间隙距离（CLED）的影响。第二阶段：使用造影剂硬膜造影确定硬膜外间隙，并根据身体状况评分（BCS）以及尸体枕骨 - 尾骨长度（OCL）（公式（1）：= 7.3 + 0.05 * OCL + 16.45 * BCS）或髂骨翼距离（IWD）（公式（2）：= 3.5 + 0.56 * IWD + 16.6 * BCS），将SLED与数学公式进行分析对比。未检测到骨盆肢体位置与CLED之间存在差异。两个公式均显示与SLED有很强的相关性（公式（1）： = 0.7196；公式（2）： = 0.7590）。公式（1）的一致性水平高于公式（2）（一致性系数分别为0.6061和0.3752）。与公式（2）相比，公式（1）也显示出与一致性线的拟合度更高（偏差校正因子分别为0.8422和0.4960）。对清醒麻醉犬进行的进一步研究将有助于确定在进行腰骶部硬膜外麻醉时术前知识的实用性。
