The Use of a Continuous Popliteal Sciatic Nerve Block After Surgery Involving the Foot and Ankle: Does It Improve the Quality of Recovery?

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The Use of a Continuous Popliteal Sciatic Nerve Block After Surgery Involving the Foot and Ankle: Does It Improve the Quality of Recovery? AMBULATORY ANESTHESIA SOCIETY FOR AMBULATORY ANESTHESIA SECTION EDITOR PAUL F. WHITE The Use of a Continuous Popliteal Sciatic Nerve Block After Surgery Involving the Foot and Ankle: Does It Improve the Quality of Recovery? Paul F. White, PhD, MD, FANZCA*, Tijani Issioui, MD*, Gary D. Skrivanek, MD*, John S. Early, MD†, and Cynthia Wakefield* Departments of *Anesthesiology and Pain Management and †Orthopedic Surgery, University of Texas Southwestern Medical Center at Dallas, Dallas, Texas Popliteal sciatic nerve block is a commonly used tech- 1 week after surgery to assess pain scores, as well as nique for surgery involving the foot and ankle. How- patient satisfaction with their pain management and ever, pain can be difficult to control as the local anes- quality of recovery, by using a 100-point verbal thetic block wears off. Therefore, we hypothesized that rating scale (1 ϭ highly dissatisfied to 100 ϭ highly extending the block by using a continuous infusion of satisfied). In the bupivacaine group, there was a bupivacaine (0.25%) would provide improved pain statistically significant reduction in the maximal management and might facilitate the recovery process pain scores (Ͼ50%) and in opioid use (Ͼ60%) dur- after foot or ankle surgery. In this randomized, double- ing the postoperative period compared with the blinded, placebo-controlled study, 24 consenting pa- control group. Patient satisfaction with postopera- tients undergoing foot or ankle surgery with a stan- tive pain management (95 Ϯ 3 versus 77 Ϯ 13) and dardized general anesthetic technique were studied. quality of recovery (96 Ϯ 7 versus 83 Ϯ 14) was Before surgery, a popliteal sciatic nerve block was per- significantly improved in the bupivacaine group formed in all patients with an 18-gauge Tuohy epidural (versus control). In addition, 40% of the patients in needle and a peripheral nerve stimulator. After injec- the bupivacaine group (versus none in the control tion of bupivacaine 0.25% 30 mL and placement of a group) were able to be discharged home on the day 20-gauge catheter, patients were randomly assigned to of surgery (P ϭ 0.087). In conclusion, a continuous receive either 0.9% saline (control) or bupivacaine infusion of bupivacaine 0.25% decreased postoper- 0.25% at a constant rate of 5 mL/h for up to 48 h after ative pain and the need for opioid analgesic rescue surgery. An 11-point verbal rating scale (0 ϭ no pain to medication after orthopedic surgery involving the 10 ϭ worst pain imaginable) was used to assess the foot and ankle, leading to improved patient satis- severity of pain. Opioid analgesic use was recorded faction and quality of recovery. at specific time intervals after surgery. Follow-up evaluations were performed at 24 h, 48 h, 72 h, and (Anesth Analg 2003;97:1303–9) ontinuous peripheral neural blockade (CPNB) needle and catheter insertion techniques and simpli- techniques were first described Ͼ50 yr ago for fied drug delivery systems, as well as efforts to facil- C the management of postoperative pain (1). itate an earlier discharge after painful orthopedic pro- However, renewed interest in the use of these CPNB cedures. Many reports have described the potential techniques is a result of the availability of improved usefulness of these techniques in the postoperative period after major orthopedic procedures involving The medical supplies required for this study were provided by I-Flow the lower extremities (2–9). Increasingly, CPNB tech- Corporation (Lake Forest, CA) and B. Braun (Bethlehem, PA). Depart- niques are being used outside the hospital to treat mental resources and funds from the McDermott Chair of Anesthesi- patients undergoing painful ambulatory surgery pro- ology were used to support Dr. White’s clinical research program. Accepted for publication June 3, 2003. cedures (9–12). Address correspondence to Paul F. White, PhD, MD, FANZCA, In a recently published study, Ilfeld et al. (12) dem- Department of Anesthesiology and Pain Management, University of onstrated that the use of a continuous popliteal sciatic Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, TX 75390-9068. Address e-mail to [email protected]. No nerve block with an electronic pump for pain control reprints will be available. after lower extremity surgery decreased pain, opioid DOI: 10.1213/01.ANE.0000082242.84015.D4 use, and side effects while improving overall patient ©2003 by the International Anesthesia Research Society 0003-2999/03 Anesth Analg 2003;97:1303–9 1303 1304 AMBULATORY ANESTHESIA WHITE ET AL. ANESTH ANALG CONTINUOUS PERINEURAL BLOCK AFTER FOOT AND ANKLE SURGERY 2003;97:1303–9 satisfaction. Although reports describing the success- imaginable. After standard noninvasive monitors were ful use of CPNB techniques for pain control after applied, midazolam 1–2 mg IV and fentanyl 50–150 ␮g major orthopedic procedures in the ambulatory set- IV were administered for sedation and analgesia, respec- ting are very encouraging (9–12), there have also been tively, before the nerve block procedure was performed. reports describing technical difficulties related to An attending anesthesiologist (GDS) experienced in per- pump malfunctions, as well as misplaced, displaced, forming popliteal nerve blocks for lower extremity sur- and obstructed catheters (13–15). In the study by Ilfeld gery performed all the block procedures by using a et al. (12), 30% of the patients required unscheduled modification of the original technique of Singelyn et al. phone calls after discharge. A recent report by Cap- (2) as described by Brown (18). devila et al. (16) found that the use of disposable The patients were placed in the prone position, and elastomeric pumps for CPNB was associated with the popliteal crease was identified. The cephalo-lateral fewer technical problems and greater patient satisfac- quadrant was identified, and local skin infiltration tion than electronic pumps. Similarly, comparative was performed by using 1% lidocaine at a point 5 cm evaluation of electronic versus nonelectronic patient- above the popliteal crease and 1 cm lateral (Fig. 1A). controlled analgesic (PCA) devices demonstrated that The Stimuplex HNS11 peripheral nerve stimulator (B. the use of a nonelectronic device was associated with Braun Medical Inc., Bethlehem, PA) was connected to an fewer programming errors and greater patient and insulated 18-gauge Tuohy needle; an appropriate motor nurse satisfaction (17). Therefore, additional studies response was initially achieved by using a 1.0-mA cur- are needed to evaluate the effect of CPNB by using rent and was then decreased to 0.5 mA. A total of 30 mL nonelectronic devices on clinically important patient of 0.25% bupivacaine was injected through the needle in outcome variables after orthopedic surgery (e.g., pain all cases. A 20-gauge epidural catheter was inserted ap- scores, hospital discharge, resumption of normal ac- proximately 2–3 cm beyond the tip of the needle, and tivities, and patient satisfaction). after the needle was removed, the catheter was carefully We designed a prospective, randomized, placebo- secured in place (Fig. 1B). Before entering the operating controlled study to assess the benefits of a CPNB after room (OR), patients were assigned to one of two study surgery involving the foot and ankle by using a dis- groups according to a computer-generated randomiza- posable, nonelectronic (elastomeric) device. We hy- tion number table. The control group received an infu- pothesized that the use of a continuous popliteal per- sion of 0.9% saline, and the bupivacaine group received ineural block with bupivacaine 0.25% would improve an infusion of generic bupivacaine 0.25% at 5 mL/h for pain management after these orthopedic procedures. up to 48 h after surgery by using a disposable elasto- We also examined patient outcome with respect to meric pump (C-bloc™ PNB system; I-Flow Corp., Lake their satisfaction with pain management and the qual- Forest, CA) connected to the catheter. The pump reser- ity of their recovery. voir contained 270 mL of the study drug (either 0.9% saline or 0.25% bupivacaine) and was filled by a hospital OR pharmacist who was not directly involved in the study. Methods The patient was promptly transferred to the OR, After we obtained IRB approval at the University of and standard monitors were applied. The presence Texas Southwestern Medical Center and written, in- of hypesthesia in the distribution of the popliteal formed consent, 24 healthy patients (aged 18 to 85 yr) nerve was documented by using a needle tip and undergoing foot (e.g., bunionectomies or clawtoe/ alcohol sponge. General anesthesia was induced hammertoe corrections) or ankle (e.g., bone fusions or within 15 min after the block was performed, by internal fixation) procedures were enrolled in this using propofol 1.75–2.5 mg/kg IV and fentanyl double-blinded, placebo-controlled study. Patients 0.75–1.5 ␮g/kg IV. Anesthesia was maintained with were excluded if they were allergic to local anesthet- desflurane (3% end-tidal concentration) in combina- ics, had an active infection involving their lower ex- tion with air (0.5 L/min) and oxygen (0.5 L/min). tremity, were pregnant (or lactating), had any neuro- Supplemental bolus doses of sufentanil 5 ␮gIV logical dysfunction or diabetes, had a history of were administered as needed to treat acute auto- chronic opioid (narcotic) analgesic use or drug abuse, nomic responses and/or purposeful movements or had unstable cardiovascular, renal, or hepatic dis- during the operation. eases. In addition, patients who were not able and On awakening from general anesthesia, patients willing to comply with the instructions for using the were transferred to the postanesthesia care unit elastomeric pump after surgery were excluded from (PACU). Patients were asked to evaluate the severity participating in the study. of their pain on the 11-point VRS at 1, 2, 4, 8, 24, 48, In the preoperative holding area, patients completed a and 72 h after surgery.
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