Abdominal girth has a strong correlation with ultrasound-estimated epidural depth in parturients: a prospective observational study
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Preprocedural ultrasound examination of vertebral column guides to locate desired intervertebral space and provides a prevision of needle trajectory and estimated needle depth in parturients. The objective of this study was to assess the correlation between ultrasound-estimated epidural depth (ED) with abdominal girth (AG), body mass index (BMI), weight, height, and age.
In this prospective, observational study, ultrasound imaging was done at L3–4 interspace in transverse median plane (TP) and paramedian sagittal oblique plane (PSO) to obtain ultrasound estimates of skin to epidural space depth. Combined spinal epidural anesthesia was performed at L3–4 interspace. AG, BMI, age, height, and weight were recorded for every parturient.
Data from 130 parturients were analyzed. Estimated ED was 56.5 ± 9.5 mm in TP, 57.5 ± 9.3 mm in PSO, and actual epidural depth was 57.9 ± 9.4 mm. Correlation coefficients between ED and AG were 0.797 in TP (95% CI 0.727–0.854, p < 0.001) and 0.803 in PSO (95% CI 0.733–0.857, p < 0.001). Correlation coefficients between ED and BMI were 0.543 in TP (95% CI 0.405–0.661, p < 0.001) and 0.566 in PSO (95% CI 0.428–0.680, p < 0.001). Correlation coefficients between ED and weight were 0.593 in TP (CI = 0.466–0.695, p < 0.001) and 0.615 in PSO (CI = 0.500–0.716, p < 0.001). Height and age had no significant correlation with ED.
Abdominal girth has a strong correlation with ultrasound-estimated epidural depth in parturients.
KeywordsAbdominal girth BMI Weight Epidural Ultrasound
The hospital supplied ultrasound device. The authors supplied financial support for the study.
MC: project design, data collection, statistical analysis, and writing manuscript. FKC: data collection, supervision, writing, and final manuscript check. NK: data collection and statistical analysis. MH: data collection and final manuscript check.
Compliance with ethical standards
Conflict of interest
All authors declare that they have no conflict of interest.
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