Rectus Abdominis Muscle Parameters and Postoperative Opioid Consumption in Geriatric Patients

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.

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Key information

Conditions

Postoperative Pain Neurologic Manifestations Pain Pain, Postoperative Pathologic Processes Pathological Conditions, Signs and Symptoms Postoperative Complications Signs and Symptoms

Age range

65 year and older

Sex eligibility

All sexes

Study type

Observational

Primary location

Istinye Üniversity

Istanbul, Merkez Mahallesi, 34250, Turkey (Türkiye)

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

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
Moderate to severe cognitive impairment or poor cooperation
Body mass index (BMI) >40 kg/m²
Cachexia or severe malnutrition
Chronic opioid use (≥3 months)
Chronic pain syndromes requiring regular analgesic use
Alcohol or substance abuse
Emergency surgery
Use of additional regional anesthesia techniques (e.g., epidural, TAP block)
Inadequate ultrasound visualization of the target anatomical plane

Treatment and study plan

Ultrasound-Guided Rectus Sheath Block

Other

Ultrasound-guided rectus sheath block will be performed as part of routine clinical practice in geriatric patients undergoing abdominal surgery. No additional intervention will be introduced for study purposes. Ultrasound-derived rectus abdominis muscle thickness and thickening fraction will be measured preoperatively, and postoperative opioid consumption and pain scores will be recorded within the first 24 hours.

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.

Study contacts

Contact information is provided by the study sponsor or research team.

İlke Dolgun

CONTACT

[email protected]

5555485632

Sponsors and collaborators

Lead sponsor

Istinye University

Other

Registry information

Official study title

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

Important dates

Study start: 2026
Primary completion: 2026
Study completion: 2026
First posted: Apr 22, 2026
Registry last updated: Apr 22, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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