Subpectoral Plexus Block With Multi-level TPVB for Surgical Anesthesia During Primary Breast Cancer Surgery

• ClinicalTrials.gov Identifier: NCT04933266
• Recruitment Status: Recruiting
• First Posted: June 21, 2021
• Last Update Posted: September 1, 2021
• Sponsor: Chinese University of Hong Kong
• Information provided by (Responsible Party): Prof Manoj K Karmakar, Chinese University of Hong Kong

Tracking Information

• First Submitted Date: June 17, 2021
• First Posted Date: June 21, 2021
• Last Update Posted Date: September 1, 2021
• Actual Study Start Date: August 6, 2021
• Estimated Primary Completion Date: August 2022 (Final data collection date for primary outcome measure)

Current Primary Outcome Measures (submitted: June 18, 2021)

Proportion of patients requiring intraoperative ketamine [ Time Frame: during surgery ]

The total number of patients (in percentage) requiring intraoperative ketamine bolus during the surgery

• Original Primary Outcome Measures: Same as current

Current Secondary Outcome Measures (submitted: June 18, 2021)

• Total amount of rescue ketamine used [ Time Frame: during surgery ]
  The total amount of rescue ketamine (mg) required during surgery
• Specific surgical region requiring rescue ketamine [ Time Frame: during surgery ]
  The exact surgical region(s), such as infraclavicular, parasternal, axillary, subcostal) that rescue ketamine has to be given during surgery
• Pain score on admission at Post Anaesthetic Care Unit (PACU) [ Time Frame: Assessed once on admission at Post Anaesthetic Care Unit immediately after surgery ]
  Pain score (Numeric rating scale 0-100; 0=no pain, 100=severe pain) on admission at PACU
• Pain score at Discharge of Post Anaesthetic Care Unit (PACU) [ Time Frame: immediately before discharge from PACU ]
  Pain Score (Numeric rating scale 0-100; 0=no pain, 100=severe pain) at discharge from PACU

• Original Secondary Outcome Measures: Same as current
• Current Other Pre-specified Outcome Measures: Not Provided
• Original Other Pre-specified Outcome Measures: Not Provided

Descriptive Information

• Brief Title: Subpectoral Plexus Block With Multi-level TPVB for Surgical Anesthesia During Primary Breast Cancer Surgery
• Official Title: Ultrasound-guided Subpectoral Plexus Block With Multi-level Thoracic Paravertebral Block for Surgical Anaesthesia During Primary Breast Cancer Surgery: A Prospective Randomized Double-blind Trial
• Brief Summary: The objective of this study is to compare two different doses of local anesthetics (10ml vs 20ml of 0.25% levobupivacaine) for subpectoral plexus block (SPPB) in addition to ultrasound guided multi-level of thoracic paravertebral block (m-TPVB) for surgical anaesthesia for major primary breast cancer surgery.
• Detailed Description: Primary breast cancer surgery is one of the most commonly performed surgeries worldwide. It is associated with significant acute postoperative pain and a high incidence of chronic postsurgical pain. Regional anaesthetic techniques are shown to improve outcomes such as postoperative analgesia, nausea, vomiting, delirium and promote early recovery. Currently majority of the breast cancer surgery is performed under general anaesthesia with a multimodal analgesic regimen with or without regional blocks. In fact, it is proved that breast cancer surgery can be done solely under regional anesthesia using multilevel thoracic paravertebral block (TPVB) with deep sedation, but rescue analgesia are often required intraoperatively, especially when surgeons handles the pectoralis muscle. Current evidence suggest that pectoral nerves, which are often described as a pure motor nerves that control movements only, also able to send noxious stimulation such as pain from the pectoral muscles and its deep fascia (via afferent nociceptive fibers) to the brain. Principal investigator proposes that adding a subpectoral plexus block (SPPB) will stop a wider spectrum of afferent nociceptive fibers from sending any pain signals than having thoracic paravertebral block alone. However, there is no report on the amount of local anaesthetic (LA) required to achieve surgical anaesthesia for breast surgery. The aim of this study is to evaluate the effectiveness of two different doses (10ml vs 20ml of 0.25% levobupivacaine) of local anaesthetic (LA) for subpectoral plexus in addition to 3 levels of TPVB injections at T2, T4, and T6 under ultrasound guidance for surgical anaesthesia for major breast cancer surgery.
• Study Type: Interventional
• Study Phase: Not Applicable

Study Design

Allocation: Randomized
Intervention Model: Parallel Assignment
Intervention Model Description:

Patients will be randomly assigned to received either 10ml of 0.25% levobupivacaine (Group LD) or 20ml of 0.25% levobupivacaine (Group HD). The randomization sequence will be generated using an online randomization software (www.randomization.com). The randomization sequence will be assigned as 1=low dose 10ml (Group LD) and 2=high dose 20ml (Group HD). The group allocation will be prepared by a computer officer (third party) in the Department of Anaesthesia & Intensive Care of the Chinese University of Hong Kong.

Masking: Double (Participant, Outcomes Assessor)
Masking Description:

Patients in both study groups will not be able to know the dosage they will receive during the block and therefore will be blinded to group allocation. The "outcome assessor" (research nurse) will not be presented in the procedure room during block placement and thus will also be blinded to group allocation. The anesthesiologist (principal investigator) performing the allocated block will take no further part in the study after block placement.

Primary Purpose: Treatment

• Condition: Breast Cancer

Intervention

• Procedure: Subpectoral plexus block (low dose)
  It is one type of peripheral nerve blocks for surgery over the chest. Patients will have an ultrasound scan and nerve block with local anesthetic (LA) agent (0.25% levobupivacaine 10ml) injected 2 target sites through one skin puncture. One at the myofascial plane between the pectoralis major and minor (5ml of LA) and then under direct ultrasound visualization, the needle will be redirected and the remaining 5ml of LA will be injected at the plane between the pectoralis minor and the serratus anterior muscle, close to the origin of thoracoacromial artery from the axillary artery at the level of the third rib.
  Other Name: Drug (0.25% Chirocaine)
• Procedure: Subpectoral plexus block (High dose)
  It is one type of peripheral nerve blocks for surgery over the chest. Patients will have an ultrasound scan and nerve block with local anesthetic (LA) agent (0.25% levobupivacaine 20ml) injected 2 target sites through one skin puncture. One at the myofascial plane between the pectoralis major and minor (10ml of LA) and then under direct ultrasound visualization, the needle will be redirected and the remaining 10ml of LA will be injected at the plane between the pectoralis minor and the serratus anterior muscle, close to the origin of thoracoacromial artery from the axillary artery at the level of the third rib.
  Other Name: Drug (0.25% Chirocaine)

Study Arms

• Active Comparator: Low dose
  After three injections of thoracic paravertebral block at T2, T4, T6 (a total of 21ml of 0.5% levobupivacaine with 1:200,000 adrenaline) under ultrasound guidance, patients will be put in supine position with ipsilateral arm and elbow flexed. Ultrasound scan will be performed below collarbone region, 5ml of 0.25% levobupivacaine will be injected in the first plane between pectoralis major and minor. Then under direct ultrasound visualization, the remaining 5ml of 0.25% levobupivacaine will be injected between the second plane of pectoralis minor and serratus anterior muscle (a total of 10ml will be given).
  Intervention: Procedure: Subpectoral plexus block (low dose)
• Active Comparator: High dose
  After three injections of thoracic paravertebral block at T2, T4, T6 (a total of 21ml of 0.5% levobupivacaine with 1:200,000 adrenaline) under ultrasound guidance, patients will be put in supine position with ipsilateral arm and elbow flexed. Ultrasound scan will be performed below collarbone region, 10ml of 0.25% levobupivacaine will be injected in the first plane between pectoralis major and minor. Then under direct ultrasound visualization, the remaining 10ml of 0.25% levobupivacaine will be injected between the second plane of pectoralis minor and serratus anterior muscle (a total of 20ml will be given).
  Intervention: Procedure: Subpectoral plexus block (High dose)

• Publications *: Not Provided

Recruitment Information

• Recruitment Status: Recruiting
• Estimated Enrollment (submitted: June 18, 2021): 100
• Original Estimated Enrollment: Same as current
• Estimated Study Completion Date: September 2022
• Estimated Primary Completion Date: August 2022 (Final data collection date for primary outcome measure)

Eligibility Criteria

Inclusion Criteria:

• scheduled for mastectomy, modified radical mastectomy or breast conservative surgery with lymph node biopsy and with or without axillary dissection

Exclusion Criteria:

• local skin site infection
• coagulopathy
• history of allergy to local anesthetics

Sex/Gender

• Sexes Eligible for Study: All

• Ages: 18 Years to 80 Years (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Contacts

Contact: Winnie Samy, RN, BN, MSc; 3505 2734; wsamy@cuhk.edu.hk

• Listed Location Countries: Hong Kong

Administrative Information

• NCT Number: NCT04933266
• Other Study ID Numbers: mTPVB SPPB Ver 2
• Has Data Monitoring Committee: No

U.S. FDA-regulated Product

• Studies a U.S. FDA-regulated Drug Product: No
• Studies a U.S. FDA-regulated Device Product: No

• IPD Sharing Statement: Not Provided
• Current Responsible Party: Prof Manoj K Karmakar, Chinese University of Hong Kong
• Original Responsible Party: Same as current
• Current Study Sponsor: Chinese University of Hong Kong
• Original Study Sponsor: Same as current
• Collaborators: Not Provided

Investigators

• Principal Investigator: Manoj K Karmakar, MD; Chinese University of Hong Kong

• PRS Account: Chinese University of Hong Kong
• Verification Date: August 2021