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Initial Local Anesthetic Dose With Continuous Interscalene Analgesia

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00672100
Recruitment Status : Completed
First Posted : May 6, 2008
Results First Posted : May 23, 2013
Last Update Posted : March 7, 2017
Beaumont Foundation of America
Information provided by (Responsible Party):
William Beaumont Hospitals

Brief Summary:
Objective: To determine a minimally effective initial local anesthetic bolus required to provide satisfactory analgesia using continuous brachial plexus infusion following arthroscopic shoulder surgery using a double-blind, randomized, study comparing 3 initial doses.

Condition or disease Intervention/treatment Phase
Post-operative Pain Drug: Ropivacaine Not Applicable

Detailed Description:


  1. To compare pain ratings and supplemental analgesic requirements at discharge from PACU, 24 hours, and 48 hours and 12 weeks following 5, 10, and 20 ml boluses.
  2. To compare adverse events including clinical dysphonia, Horner's syndrome, dyspnea, unexpected hospitalization, evidence of local anesthetic toxicity, and hand weakness at discharge from PACU following 5, 10, and 20 ml boluses.
  3. To compare impairment in diaphragmatic excursion at discharge from PACU following 5, 10, and 20 ml boluses.
  4. To compare patients' satisfaction with analgesia at 24 and 48 hours following 5, 10, and 20 ml boluses.
  5. To compare patient rating of functional outcome at baseline and at 12 weeks following 5, 10, and 20 ml boluses.
  6. To compare the rate of general anesthesia required following 5, 10, and 20 ml boluses.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 36 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Triple (Participant, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: The Effect Of Initial Local Anesthetic Dose With Continuous Interscalene Analgesia On Postoperative Pain And Diaphragmatic Function In Arthroscopic Shoulder Surgery Patients: A Double-Blind, Randomized, Parallel Group, Dose-Ranging Study
Study Start Date : January 2009
Actual Primary Completion Date : February 2010
Actual Study Completion Date : August 2010

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Active Comparator: A
Initial Bolus 5 ml Ropivacaine
Drug: Ropivacaine
Initial Bolus 5 ml Ropivacaine via interscalene injection

Active Comparator: B
Initial Bolus 10 ml Ropivacaine
Drug: Ropivacaine
Initial Bolus 10 ml Ropivacaine via interscalene injection

Active Comparator: C
Initial Bolus 20 ml Ropivacaine
Drug: Ropivacaine
Initial Bolus 20 ml Ropivacaine via interscalene injection

Primary Outcome Measures :
  1. Pain Measurements Via Numeric Pain Rating Scales (NRS) [ Time Frame: Discharge, 24 h, 48h, 12 weeks ]
    Pain was reported via NRS ranging from 0 (no pain) to 10 (worst pain imaginable)

  2. Change in Diaphragmatic Displacement From Baseline to Post-surgery [ Time Frame: Baseline, Post anesthesia care unit (PACU) - within 8 hours ]
    Diaphragm displacement from exhale to inhale. The baseline diaphragm measurement was obtained pre-operatively before the block was administered prior to surgery. This was again measured post-operatively before the patient's discharge from the Post-anesthesia Care Unit.

Secondary Outcome Measures :
  1. Percentage of Participants Who Considered the Analgesic Technique "Helpful" or "Extremely Helpful" [ Time Frame: at 24 and 48 hours after discharge from the hospital ]

    Participants were asked to rate the helpfulness of their infusion:

    1. extremely harmful
    2. harmful
    3. neutral
    4. not harmful, but not helpful
    5. helpful
    6. extremely helpful

  2. Functional Outcome - Simple Shoulder Test (SST) [ Time Frame: Baseline, 12 weeks ]
    At baseline and again at 12 weeks subjects completed the Simple Shoulder Test. This test is a series of 12 (yes/no) questions. Participants get 1 point if they answer yes (they can perform the task) and 0 if they answer no. Total possible range is from 0-12. This has been shown to be a valid, reliable and consistent for subjects up to and including 60 years of age when similar injuries (rotator cuff dysfunction) are assessed.

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 80 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Provide written informed consent prior to participation in the study.
  • Is scheduled to undergo Arthroscopic Rotator Cuff Repair, defined as arthroscopically assisted repair of any of the muscles or tendons comprising the rotator cuff.
  • If subject is a female of childbearing potential, have a negative pregnancy test on the day of surgery per standard of care
  • Be at least 18, but not more than 80 years of age
  • Have an ASA risk class of I, II, or III according to the American Society of Anesthesiologists (ASA).
  • Have the ability to read and understand the study procedures and the use of the pain scales. Must have the ability to communicate meaningfully with the Study Investigator and staff.
  • Be free of other physical, mental, or medical conditions, which in the opinion of the Investigator, makes study participation inadvisable.

Exclusion Criteria:

  • Subjects requiring daily opioids equivalent to greater than 40 mg oxycodone for over 2 weeks prior to the study.
  • Has significant preexisting pulmonary (respiratory/breathing) disease, diaphragmatic paralysis or history of phrenic nerve injury (problems with the diaphragm causing breathing difficulties).
  • Has significant medical disease(s), laboratory abnormalities or condition(s) that in the Investigator's judgment could compromise the subject's welfare, ability to communicate with the study staff, complete study activities, or would otherwise contraindicate study participation.
  • Has known significant hypersensitivity to opioids, Ropivacaine, or the inactive ingredients (excipients) of the study medications.
  • Has known or suspected history of alcohol or drug abuse or dependence within the previous 2 years.
  • Has clinically significant liver disease, or other condition (e.g., alcoholism, cirrhosis, or hepatitis) based on medical history and examination.
  • Has participated in another clinical Study (investigational or marketed product within 30 days of surgery.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00672100

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United States, Michigan
William Beaumont Hospital
Royal Oak, Michigan, United States, 48073
William Beaumont Hospitals
Troy, Michigan, United States, 48085
Sponsors and Collaborators
William Beaumont Hospitals
Beaumont Foundation of America
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Principal Investigator: Craig Hartrick, MD William Beaumont Hospitals
Publications of Results:
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Responsible Party: William Beaumont Hospitals Identifier: NCT00672100    
Other Study ID Numbers: HIC 2007-198
First Posted: May 6, 2008    Key Record Dates
Results First Posted: May 23, 2013
Last Update Posted: March 7, 2017
Last Verified: May 2013
Keywords provided by William Beaumont Hospitals:
Peripheral Nerve Infusion,
continuous brachial plexus block,
post-operative pain
diaphragmatic paresis
Additional relevant MeSH terms:
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Pain, Postoperative
Postoperative Complications
Pathologic Processes
Neurologic Manifestations
Anesthetics, Local
Central Nervous System Depressants
Physiological Effects of Drugs
Sensory System Agents
Peripheral Nervous System Agents