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This study was also designed to assess the ability of the ultrasound to define the best needle insertion point and limit the number of needle skin puncture attempts.

Exclusion criteria included pregnancy, prisoners, and patients with an absolute contra-indication to thoracic epidural.

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Mean ultrasound distance UD values were 4. The use of ultrasound to aid in regional blocks has increased in recent years as a result of improvement in ultrasound technology. Ultrasound scanning can be used to measure the depth of the thoracic epidural space with good correlation.

Both longitudinal para-median and transverse scan were done before the placement of the epidural catheter.