Nerve stimulator versus ultrasound guidance for placement of popliteal catheters for foot and ankle surgery

作者：Maalouf Daniel; Liu Spencer S^*; Movahedi Rana; Goytizolo Enrique; Memstoudis Stavros G; YaDeau Jacques T; Gordon Michael A; Urban Michael; Ma Yan; Wukovits Barbara; Marcello Dorothy; Reid Shane; Cook Amanda

来源：Journal of Clinical Anesthesia, 2012, 24(1): 44-50.

DOI：10.1016/j.jclinane.2011.06.008

• Foot and ankle surgery
• Nerve stimulator
• Popliteal catheter
• Regional anesthesia: Continuous popliteal block
• Ultrasonography

Study Objective: To determine whether ultrasound guidance improves the quality of continuous popliteal block when compared with a nerve stimulator after major foot and ankle surgery.
Design: Prospective, randomized, double-blinded clinical trial.
Setting: Operating room, Postanesthesia Care Unit (PACU), and hospital wards of a university-affiliated hospital.
Patients: 45 ASA physical status 1, 2, and 3 patients undergoing elective major foot and ankle surgery.
Interventions: Placement of a popliteal sciactic nerve catheter using either nerve stimulator or ultrasound guidance. In the PACU, a continuous infusion of ropivacaine 0.2% was started at a basal rate of 4 mL/hr and adjusted in a standardized fashion to maintain visual analog scale (VAS) pain scores <4. All patients also received intravenous (IV) patient-controlled analgesia with hydromorphone and oral opioids.
Measurements: VAS pain scores at rest and with physical therapy, ropivacaine use, opioid use, and opioid-related side effects were recorded.
Main Results: Cummulative ropivacaine use was lower in patients whose catheter was placed by ultrasound than by nerve stimulator guidance (mean 50 vs 197 mL, P < 0.001). Pain scores at rest and during activity were similar between groups. Cumulative opioid consumption (mean 858 vs 809 mg oral morphine equivalents) and daily frequencies of nausea (5% to 33% vs 0 to 24%) and pruritus (0 to 21% vs 0 to 24%) were similar between groups. Length of hospital stay was similar between groups (3.5 vs 3.7 days).
Conclusions: Ultrasound guidance was associated with less local anesthetic consumption than with the nerve stimulator; however, there was little clinical benefit, as all other outcomes were similar between groups.

• 出版日期2012-2