Effectiveness of Unilateral Transversus Abdominis Plane (TAP) Block vs Bilateral TAP Block in Patients Undergoing Laparoscopic Cholecystectomy.

April 2, 2026 updated by: King Edward Medical University

Comparison of Efficacy of Unilateral Transversus Abdominis Plane (TAP) Block Versus Bilateral Transversus Abdominis Plane (TAP) Block in Patients Undergoing Laparoscopic Cholecystectomy.

In this study, patients undergoing laparoscopic cholecystectomy will be randomly divided into 2 groups after consent. Group A patients will be administered a one-sided (right unilateral) regional TAP block and group B patients will be administered the same block on both sides (bilateral) and the effects in terms of post surgery pain during the 1st 24 hours, nausea vomiting, and the need and dosage of intravenous analgesic and antiemetic will be studied to see whether one technique is superior to the other or not.

Study Overview

Status

Enrolling by invitation

Conditions

Intervention / Treatment

Detailed Description

  1. INTRODUCTION:

    Laparoscopic cholecystectomy (LC) is the gold standard procedure for individuals with symptomatic gallstone disease. Although LC is a minimally invasive procedure with very less morbidity, early post-operative pain still a significant issue.1 Adequate pain control is therefore necessary to improve clinical outcomes, patient satisfaction and to ensure early mobility of the patients. Pain after laparoscopic cholecystectomy can be broadly classified into 3 categories: (a) somatic pain due to skin incisions; (b) Visceral pain due to intra-abdominal gallbladder dissection and; (c) reflected visceral pain or referred pain to the tip of right shoulder. Out of these, the somatic pain from port site incisions is the most troublesome for patients. Various methods have been tried to reduce post-operative pain after LC, one of which is the Transversus abdominis plane (TAP) block. TAP block is a regional anesthesia technique used for post-operative analgesia in abdominal surgeries. TAP block was first described by Rafi et al in 2001, as a regional block, in which local anesthesia is injected through triangle of petit to achieve analgesia of the T6 to L1 thoracolumbar nerves as they pass through the plane between internal oblique and transversus abdominis muscles.5,7,8 This blocks the sensory nerves in the anterolateral abdominal wall. Unilateral TAP block has been used as a part of multimodal analgesia in LC, with favorable results. However, half of the port site incisions in LC are located in the midline, i.e. the subxiphoid epigastric and the umblical ports. So, whether a unilateral TAP block alone provides adequate analgesia or not, cannot be stated as a fact. Although literature compares unilateral vs bilateral TAP in a variety of different surgical procedures, such as cesarean section and laparoscopic shockwave lithotripsy10,11 only one study is available to compare unilateral TAP versus bilateral TAP in LC.

    Thus, the rationale of this study is that more research needs to be done to compare unilateral and bilateral TAP blocks in LC so as to establish which of the two is more efficient in providing adequate analgesia and eliminating the need for post-operative intravenous opioids. This will help us to better understand the role of in TAP block in LC. It is expected that this will help in reducing the need and dosage for postoperative IV opioids thus reducing post-operative nausea and vomiting (PONV), improve patient satisfaction and allow early mobilization of the patient. Mayo hospital Lahore is one of the largest government sector hospitals of Punjab with a dedicated surgical facility well equipped to deal with large numbers of patients with symptomatic gallstones. This makes this hospital an ideal set-up for conducting this research.

  2. OBJECTIVE:

    Primary objective of this study is to compare unilateral and bilateral TAP blocks in terms of efficacy in terms of mean duration of postoperative analgesia and the need and amount of post- operative IV opioids needed. Secondary objectives include comparison of both blocks in terms of PONV, the need and amount of ondensetron, and patient satisfaction.

  3. OPERATIONAL DEFINITIONS:

    1. TRANVERSUS ABDOMINIS PLANE (TAP) BLOCK:

      Tap block is a regional block, where a local anesthetic is inserted into the triangle of petit in the plane between internal oblique and transversus abdominis muscles to block the neuronal afferents from T6-L1 spinal roots, which provide somatic supply to the anterolateral abdominal wall.

    2. TRIANGLE OF PETIT:

      An anatomical landmark in the posterolateral abdominal wall bounded anteriorly by the most posterior attachment of external oblique muscle, posteriorly by the most anterior attachment of lattismus dorsi muscle and inferiorly by the iliac crest. The floor of the triangle is formed by internal oblique muscle.

    3. POST-OPERATIVE PAIN:

    Post-operative pain is defined as the pain intensity reported by the patient following surgery, using the Visual Numerical Rating Scale (VNRS) at rest and after cough, assessed at predefined intervals. The VNRS is a numeric scale from 0 to 10, where 0 indicates no pain and 10 indicates the worst pain imaginable.

  4. RESEARCH QUESTION:

    Is right unilateral TAP block equally effective as a bilateral TAP block in terms of decreasing post- operative pain and need for IV opioids in patients undergoing laparoscopic cholecystectomy?

  5. HYPOTHESIS:

    Bilateral TAP block is more efficacious than a right unilateral TAP block in preventing postoperative pain and need of IV opioids in patients undergoing laparoscopic cholecystectomy.

  6. NULL HYPOTHESIS:

There is no difference between a right unilateral TAP block and a bilateral TAP block in terms of post-operative pain and the need of IV opioids in patients undergoing laparoscopic cholecystectomy.

Study Type

Interventional

Enrollment (Estimated)

82

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Pakistan
    • Punjab Province
      • Lahore, Punjab Province, Pakistan, 54000
        • King Edward Medical University/ Mayo Hospital, Lahore.

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  1. Both genders between 18-80 years with symptomatic gallstone disease.
  2. Diagnosed patients that are fit for laparoscopic cholecystectomy, having ASA status of I, II or III).
  3. No documented allergies or adverse reactions to local anesthetics used.
  4. Patients consenting to participate in the study.

Exclusion Criteria:

  1. Non consenting individuals.
  2. Active skin infection at TAP block site i.e. triangle of petit.
  3. Patients with coagulopathies.
  4. Patients with chronic pain disorders and chronic use of analgesics.
  5. Patients with chronic liver and kidney diseases.
  6. Patients with alcohol, opioid or other substance addiction.
  7. History of previous major elective or emergency abdominal surgery.
  8. Pregnant and breast feeding women.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Supportive Care
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Triple

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Active Comparator: Group A
Right unilateral TAP block
Procedure: Unilateral Transversus abdominis plane (TAP) block with 0.25 % bupivacaine
TAP block is a regional anesthesia technique used for post-operative analgesia in abdominal surgeries. TAP block was first described by Rafi et al in 2001, as a regional block, in which local anesthesia is injected through triangle of petit to achieve analgesia of the T6 to L1 thoracolumbar nerves as they pass through the plane between internal oblique and transversus abdominis muscles. This blocks the sensory nerves in the anterolateral abdominal wall. Right Unilateral TAP block has been used as a part of multimodal analgesia in Lap chole (LC), with favorable results.
Experimental: Group B
Bilateral TAP block
Procedure: Bilateral Transversus abdominis plane (TAP) block with 0.25 % bupivacaine
TAP block is a regional anesthesia technique used for post-operative analgesia in abdominal surgeries. TAP block was first described by Rafi et al in 2001, as a regional block, in which local anesthesia is injected through triangle of petit to achieve analgesia of the T6 to L1 thoracolumbar nerves as they pass through the plane between internal oblique and transversus abdominis muscles. This blocks the sensory nerves in the anterolateral abdominal wall. Bilateral TAP block can be used as a part of multimodal analgesia in Lap chole (LC), because two of the ports (epigastric and umbilical) in Lap chole are in the midline and hence receive sensory supply from both right and left side.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Mean time to first request for rescue analgesia
Time Frame: Time from completion of surgery to first request for rescue analgesia till completion of 24 hrs
Time from completion of surgery to first request for rescue analgesia.
Time from completion of surgery to first request for rescue analgesia till completion of 24 hrs
The amount of postoperative IV opioids required as rescue analgesia in first 24 hrs
Time Frame: From end of surgery up to 24 hours postoperatively.
Total amount of intravenous opioid analgesic (in mg) administered in the first 24 hours after surgery
From end of surgery up to 24 hours postoperatively.

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Frequency of Postoperative nausea and vomiting (PONV)
Time Frame: From the end of surgery to the end of treatment at 24 hours postoperatively
Frequency of postoperative nausea and/or vomiting within the first 24 hours after surgery.
From the end of surgery to the end of treatment at 24 hours postoperatively

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

King Edward Medical University

Investigators

  • Principal Investigator: Aneeqah Din Muhammad, MBBS, MSurg, King Edward Medical University/ Mayo Hospital, Lahore

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

November 4, 2025

Primary Completion (Estimated)

April 4, 2026

Study Completion (Estimated)

April 4, 2026

Study Registration Dates

First Submitted

November 23, 2025

First Submitted That Met QC Criteria

April 2, 2026

First Posted (Actual)

April 6, 2026

Study Record Updates

Last Update Posted (Actual)

April 6, 2026

Last Update Submitted That Met QC Criteria

April 2, 2026

Last Verified

April 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • No.803/RC/KEMU

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

UNDECIDED

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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