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CompletedNCT05592522Updated Feb 28, 2023

Efficacy of External Oblique Intercostal Block in Laparoscopic Bariatric Surgery

An interventional study of External oblique intercostal block and Oblique subcostal TAP block in Bariatric Surgery Candidate, Pain, Postoperative and Narcotic Use, sponsored by Al Mashfa Medical Center. Completed at 1 site in Saudi Arabia. Open to participants aged 18 Years to 65 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2023-02-28.

Sponsored by Al Mashfa Medical Center · Not applicable, Interventional, and Prevention

Phase
Not applicable
Study type
Interventional
Enrollment
73
Allocation
Randomized
Ages
18 Years to 65 Years
Sex
All
01

Study summary

Laparoscopic bariatric procedures nowadays are employed under ERAS protocol as an ambulatory surgery. Pain after laparoscopic procedures arises significantly from port site incisions in the anterior abdominal wall, and shoulder pain (referred from visceral pain). Narcotic medications are utilized to manage postoperative pain, but its disadvantages include, increased post-operative nausea and vomiting (PONV), ileus, sedation and delayed hospital discharge.

Oblique subcostal transversus abdominis plane block (OSTAP) had been studied before and found to be effective in reducing post-operative morphine usage and produce good analgesia for about 24hours postoperatively.

The ultrasound-guided external oblique intercostal (EOI) block is a new technique which proved to produce unilateral analgesia at thoracic dermatomes supplying the anterior and lateral aspects of the upper abdomen.

The aim of this study was to test the hypothesis that US-guided EOI blocks can produce more reduction in opioid usage during the first 24 h after of laparoscopic bariatric surgeries when compared to oblique subcostal TAP (OSTAP) block.

02

Conditions studied

  • Bariatric Surgery Candidate
  • Pain, Postoperative
  • Narcotic Use
  • Analgesia

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03

In context

Pain, Postoperative

5,093 studies on the registry are indexed under Pain, Postoperative; 1,140 are open to participants now.

This study's enrollment of 73 is close to the median of 75 across 4,344 interventional studies indexed under Pain, Postoperative.

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Lead sponsor

Al Mashfa Medical Center is the lead sponsor of 2 studies on the registry; none are open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years to 65 Years
Sexes eligible
All
Accepts healthy volunteers
Yes

Inclusion criteria

  • age of 18 and 65;
  • American Society of Anesthesia (ASA) class II or III
  • elective laparoscopic bariatric procedure through trocars positioned at or above the um-bilicus (T10 dermatome).

Exclusion criteria

Exclusion Criteria:

  • preoperative chronic use or contraindication to opioid or NSAID
  • allergy to bupivacaine
  • local skin infection at the injection site of EOI or OSTAP blocks
  • liver or renal insufficiency
  • psychiatric, or neurological disease
  • prior open abdominal surgery above T10 dermatome
  • patients converted to open surgery; and patients expected to be subjected to more tissue trauma.
05

Study design

Phase
Not applicable
Primary purpose
Prevention
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Quadruple (Participant, Care provider, Investigator, Outcomes assessor)
Enrollment
73 participants (actual)

Study arms

  • Experimental
    EOI group

    Ultrasound-guided bilateral external oblique intercostal (EOI) using 30 ml of 0.25% bupivacaine hydrochloride and oblique subcostal transverse abdominis plane (OSTAP) block using Placebo (NSS 0.9%) 30 ml combined with bilateral posterior rectus sheath block with 15 ml bupivacaine 0.25%.

    Other: External oblique intercostal block · Other: Posterior Rectus sheath block

  • Experimental
    OSTAP group

    Ultrasound-guided bilateral oblique subcostal transverse abdominis plane (OSTAP) block using 30 ml of 0.25% bupivacaine hydrochloride and external oblique intercostal (EOI) using Placebo (NSS 0.9%) 30 ml combined with bilateral posterior rectus sheath block with 15 ml bupivacaine 0.25%.

    Other: Oblique subcostal TAP block · Other: Posterior Rectus sheath block

Interventions

  • OtherExternal oblique intercostal block

    EOI block:Under guidance of the linear high frequency transducer, sagittal plane between anterior axillary line and midclavicular line at the level of the 6th rib, In-plane approach between external oblique and intercostal muscles Hydrodissection with 30 ml of 0.25% bupivacaine hydrochloride .

    Also known as: EOI

  • OtherOblique subcostal TAP block

    OSTAP block: The needle was inserted in plane through the rectus adjacent to costal margin Once the tip of the needle was visualized in between the rectus muscle and transversus abdominus muscle and negative pressure aspiration was demonstrated, 30 ml bupivacaine 0.25% was deposited within the plane and hydrodissection was noted.

    Also known as: OSTAP

  • OtherPosterior Rectus sheath block

    Posterior rectus sheath block: Under linear ultrasound probe, the needle was advanced gradually through the rectus muscle posteriorly toward its medial edge, approaching the rectus sheath. After negative aspiration,12.5 mL bupivacaine 0.25% was injected until the rectus muscle was separated from the posterior rectus sheath by hydrodissection.

    Also known as: PRSB

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What researchers measure

Primary outcomes

  1. 24h equivalent oral morphine consumption

    Total pethidine consumption, calculated as an equivalent oral morphine dose, during the 24 hours,

    Time frame: 24 hour

  2. Numerical rating scale (NRS)

    Numerical rating scale (NRS) in the PACU, and on arrival to the ward at 0 hours then at 2, 4, 6, 12, and 24 hours postoperatively(NRS) with 0 = no pain, to 100mm = the worst imaginable pain at the specified time.

    Time frame: 24 hours

Secondary outcomes

  1. Quality of recovery 40 score(QoR-40)

    Quality of recovery 40 score at 24 hours.Twelve questions measured the comfort state; 9 questions measured the emotional state; 7 questions measured the psychological state; 5 questions measured the physical independence and 7 questions measured the level of pain. Each question received a score of 1 to 5 with a worst possible score of 40 and a best possible score of 200

    Time frame: 24 hours

  2. AMBULATION TIME

    Time to first independent ambulation

    Time frame: 24 hours

  3. Readiness for discharge

    time to readiness for discharge were measured according to the modified postoperative discharge scoring system (PADSS). Patients were considered eligible for discharge if they achieved a total score ≥ 9 on the condition that the vital signs parameter score was not less than 2, and none of the other five parameters scored a zero

    Time frame: 24 hours

07

Study locations

1 site
  • Al Mashfa medical center
    Khobar, Eastern Provence 34225/7564, Saudi Arabia
08

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Feb 28, 2023, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
09

Registry details

Key details

Study ID
NCT05592522
Lead sponsor
Al Mashfa Medical Center
Responsible party
Dr. Mohamed Ibrahim Elsayed (Anesthesia consultant, Al Mashfa Medical Center) — Principal investigator
First posted
Oct 24, 2022
Start date
Oct 26, 2022
Primary completion
Feb 20, 2023
Completion
Feb 20, 2023
Last update
Feb 28, 2023

Study contacts

Mohamed I ElSayed
principal investigator · Al Mashfa Medical Center

Oversight

FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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This study is completed, as verified in Feb 2023. You cannot join it, but the record below documents what was studied.

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