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Updated: Jun 14, 2026

Electrophysiological Methods to Assess Peripheral Pain Block in an Anesthetized Rat
Published on: November 21, 2025
Factors impacting on-time transfer to the operating room in patients undergoing peripheral nerve blocks in the
Jacques E Chelly1, Jennifer L Horne, Mark E Hudson
1Department of Anesthesiology, University of Pittsburgh Medical Center, Pittsburgh, PA 15231, USA. chelje@anes.upmc.edu
Study Objectives:
To assess the on-time transfer to the operating room (OR) when peripheral nerve blocks (PNBs) are performed prior to surgery.
Design:
Prospective time motion study.
Setting:
Preoperative area of a university medical center.
Patients:
650 candidates for PNBs for postoperative analgesia.
Intervention:
Patients were allocated to two groups: a control group (no PNB performed) and a PNB group (PNBs performed). MEASUREMENT TIME: The time required to perform each of the steps leading to transfer to the OR was recorded.
Main Results:
On-time transfer was achieved in 40% and 49% in the blocked (n = 549) and control groups (n = 101), respectively (P = 0.067, one-sided). Surgery-related delays represented the most important causes of delays (51.9% in the control group and 53.8% in the PNB group). The average time required to perform the blocks was 21 minutes (20-22 min). This time varied with the type and number of blocks performed (12-30 min). Performing PNBs accounted for 15.1% of delays.
Conclusions:
Performing PNBs prior to surgery in the preoperative area takes additional time. This time needs to be considered in optimizing on-time transfer to the OR.
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