Association Between Ultrasound-Derived Rectus Abdominis Muscle Thickness and Thickening Fraction and Postoperative Opioid Consumption in Geriatric Patients Undergoing Abdominal Surgery: A Prospective Observational Study
Overview
- Phase
- Not Applicable
- Status
- Not yet recruiting
- Sponsor
- Istinye University
- Enrollment
- 62
- Locations
- 1
- Primary Endpoint
- Postoperative Total Opioid Consumption
Overview
Brief Summary
This prospective observational study aims to evaluate the relationship between ultrasound-derived rectus abdominis muscle thickness and thickening fraction and postoperative opioid consumption in geriatric patients undergoing abdominal surgery. Preoperative ultrasonographic measurements will be performed during routine clinical care, and postoperative pain scores and analgesic requirements will be recorded within the first 24 hours. The findings may help improve individualized analgesic strategies by identifying patient-specific predictors of postoperative opioid needs.
Study Design
- Study Type
- Observational
- Observational Model
- Cohort
- Time Perspective
- Prospective
Eligibility Criteria
- Ages
- 65 Years to — (Older Adult)
- Sex
- All
- Accepts Healthy Volunteers
- No
Inclusion Criteria
- •Age ≥65 years
- •Scheduled for elective midline abdominal surgery
- •ASA physical status I-III
- •Planned to receive bilateral ultrasound-guided rectus sheath block as part of routine clinical practice
- •Provided written informed consent
Exclusion Criteria
- •Known allergy or hypersensitivity to local anesthetics
- •Infection or skin lesion at the injection site
- •Systemic infection or sepsis
- •Coagulopathy (INR \>1.5 or platelet count \<100,000/mm³)
- •Use of therapeutic anticoagulation not safely managed perioperatively
- •History of previous midline laparotomy
- •History of abdominal mesh implantation or abdominal wall reconstruction
- •Significant abdominal wall pathology (e.g., large hernia) affecting anatomy
- •Neuromuscular disease (e.g., myasthenia gravis, ALS, muscular dystrophy)
- •Inability to perform required maneuver for dynamic ultrasound measurement
Outcomes
Primary Outcomes
Postoperative Total Opioid Consumption
Time Frame: First 24 hours postoperatively
Total opioid consumption within the first 24 hours after surgery will be recorded and converted to morphine equivalents (mg). This measure will be used to evaluate the association between ultrasound-derived rectus abdominis muscle parameters and postoperative analgesic requirements.
Secondary Outcomes
No secondary outcomes reported
Investigators
İlke Dolgun
assoc.prof
Istinye University