title: Continuous ambulatory adductor canal catheters for patients undergoing knee arthroplasty surgery.
abstract: OBJECTIVE
  To determine after knee arthroplasty surgery the feasibility of discharging patients home on postoperative day 1 with continuous adductor canal blocks.
  
  
  METHODS
  Retrospective case series.
  
  
  METHODS
  Outpatient setting after hospital discharge.
  
  
  METHODS
  Patients undergoing knee arthroplasty surgery from October 2013 to August 2014.
  
  
  METHODS
  All patients received continuous adductor canal catheters for postoperative analgesia and were discharged to home on postoperative day 1. Continuous catheters were intended to remain intact in the ambulatory setting through postoperative day 3.
  
  
  METHODS
  Data obtained included demographic information, duration of hospital stay, resting and active pain scores, opioid utilization, opioid-induced adverse effects, complications relating to the perineural catheter, and hospital readmissions.
  
  
  RESULTS
  Sixty-nine of 582 patients (11.9%) were discharged to home on postoperative day 1. The median numerical pain score after discharge with a continuous adductor canal block was ≤2 at rest and ≤4 with activity. After block discontinuation on postoperative day 4, median pain scores were the same. No patients reported any unintentional catheter dislodgements, falls, or dysesthesias. There were no readmissions of any patient in this cohort within 90 days of surgery.
  
  
  CONCLUSIONS
  Ambulatory adductor canal catheters are a feasible analgesic modality after knee arthroplasty surgery as pain scores remained low and adverse events were minimal.
authors.affiliation: Department of Anesthesiology, Virginia Mason Medical Center, Seattle, WA, USA. Electronic address: neil.hanson@virginiamason.org.
authors.forename: Neil A
authors.initials: NA
authors.lastname: Hanson
authors.affiliation: Department of Anesthesiology, Virginia Mason Medical Center, Seattle, WA, USA. Electronic address: phlee325@gmail.com.
authors.forename: Phoebe H
authors.initials: PH
authors.lastname: Lee
authors.affiliation: Department of Anesthesiology, Virginia Mason Medical Center, Seattle, WA, USA. Electronic address: stanley.yuan@virginiamason.org.
authors.forename: Stanley C
authors.initials: SC
authors.lastname: Yuan
authors.affiliation: Department of Anesthesiology, Virginia Mason Medical Center, Seattle, WA, USA. Electronic address: danchoi@gmail.com.
authors.forename: Daniel S
authors.initials: DS
authors.lastname: Choi
authors.affiliation: Department of Anesthesiology, Virginia Mason Medical Center, Seattle, WA, USA. Electronic address: cindyjo.allen@virginiamason.org.
authors.forename: Cindy Jo
authors.initials: CJ
authors.lastname: Allen
authors.affiliation: Department of Anesthesiology, Virginia Mason Medical Center, Seattle, WA, USA. Electronic address: david.auyong@virginiamason.org.
authors.forename: David B
authors.initials: DB
authors.lastname: Auyong
mesh_terms: D000368:Aged; D000577:Amides / Q000008:administration & dosage / Q000627:therapeutic use*; D000698:Analgesia / Q000379:methods*; D000701:Analgesics, Opioid / Q000008:administration & dosage / Q000627:therapeutic use; D000779:Anesthetics, Local / Q000008:administration & dosage / Q000627:therapeutic use*; D019645:Arthroplasty, Replacement, Knee / Q000009:adverse effects*; D057785:Catheters; D005240:Feasibility Studies; D005260:Female; D005267:Femoral Nerve / Q000187:drug effects*; D006801:Humans; D007260:Infusion Pumps; D007902:Length of Stay; D008297:Male; D008875:Middle Aged; D009407:Nerve Block / Q000295:instrumentation / Q000379:methods*; D059408:Pain Management / Q000295:instrumentation / Q000379:methods*; D010147:Pain Measurement; D010149:Postoperative Pain / Q000188:drug therapy*; D010351:Patient Discharge; D012189:Retrospective Studies; D000077212:Ropivacaine
chemical_list: D000577:Amides; D000701:Analgesics, Opioid; D000779:Anesthetics, Local; D000077212:Ropivacaine
keywords: Adductor canal block; Continuous nerve block; Knee arthroplasty surgery; Length of stay; Readmissions