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Korean J Anesthesiol > Volume 40(3); 2001 > Article
Korean Journal of Anesthesiology 2001;40(3):308-312.
DOI: https://doi.org/10.4097/kjae.2001.40.3.308   
Correlation between Epidural Depth and Physical Measurements.
Hea Jo Yoon, Byung Moon Ham, Jae Hyon Bahk, Eun Hyoung Lee
1Department of Anesthesiology, Samsung Cheil Hospital, Seoul.
2Department of Anesthesiology, Seoul National University College of Medicine, Seoul, Korea.
Abstract
BACKGROUND
This study was performed to accurately discover the correlation between the epidural depth and physical measurements.
METHODS
We measured the L2-3, L3-4 epidural depth pre-marked on the needle shaft only when the block was successful. Correction of the depth was made by the angulation of the needle from the perpendicular line (with regard to both the x- and y-axis) to the skin. Height and weight from the medical record was noted and neck, waist, and hip circumferences of each subject was measured. Physical parameters such as waist/neck (waist circumference-to-neck circumference ratio), waist/height (waist circumference-to-height ratio), waist/hip (waist circumference-to-hip circumference ratio), weight/neck (weight- to-neck circumference ratio), weight/height (weight-to-height ratio) and body mass index (BMI) were calculated. Peason's correlation and a regression test between the epidural depth and the physical mea surements were performed.
RESULTS
Significant correlation with epidural depth was found in weight, waist, hip, neck, BMI, waist/height, waist/hip, weight/neck, and weight/height. With the regression test, we found weight to be the most important for predicting epidural depth (R square = 0.330, P < 0.05).
CONCLUSIONS
Weight has the highest predictive value for lumbar epidural depth.
Key Words: Anesthesia: depth; Anesthetic techniques: epidural; lumbar; physical measurements
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