This prospective observational study aims to evaluate renal perfusion in adult patients undergoing elective minimally invasive abdominal surgery. Renal perfusion will be assessed using two non-invasive monitoring techniques: Doppler ultrasonography-derived Renal Resistive Index (RRI) and Near-Infrared Spectroscopy (NIRS)-derived renal regional oxygen saturation (rSO₂).
Measurements will be obtained at predefined perioperative time points, including after induction of anesthesia, during pneumoperitoneum, before extubation, and during the early postoperative period. Perioperative changes in renal perfusion parameters will be analyzed and correlated with clinical variables such as intra-abdominal pressure, pneumoperitoneum duration, hemodynamic parameters, fluid administration, urine output, and postoperative renal function.
The study also aims to investigate the relationship between intraoperative renal perfusion changes and the development of postoperative acute kidney injury. The findings may contribute to improved perioperative monitoring and optimization of renal perfusion during minimally invasive abdominal surgery.
Eligibility
Sex
ALL
Min age
18 Years
Max age
80 Years
Healthy volunteers
No
Inclusion Criteria:
* Patients aged 18 to 80 years
* Patients with ASA physical status I, II, or III
* Patients undergoing elective minimally invasive abdominal surgery for any reason
* Patients whose expected surgical duration is longer than 1 hour
Exclusion Criteria:
* Body mass index greater than 35 kg/m²
* Severe respiratory system disease
* Severe heart failure, NYHA class III-IV
* Presence of a cardiac pacemaker or cardiac defibrillator implant
* Progressive neuromuscular disease
* High intra-abdominal pressure
* Sudden deterioration of general condition
* Incomplete clinical or laboratory data
* Refusal to participate in the study
* Conversion to open surgery
Primary outcome measure(s)
Change in Renal Regional Oxygen Saturation Measured by NIRS — after endotracheal intubation, immediately before extubation, and 1 hour after extubation Renal regional oxygen saturation (rSO₂) will be measured bilaterally using Near-Infrared Spectroscopy (NIRS). NIRS values will be recorded at predefined perioperative time points.
Change in Renal Resistive Index — after endotracheal intubation, immediately before extubation, and 1 hour after extubation Renal Resistive Index (RRI) measured by Doppler ultrasonography at predefined perioperative time points. RRI will be calculated from peak systolic velocity and end-diastolic velocity obtained from renal interlobar or arcuate arteries.
Trial sites (1)
Facility
City
Region
Status
Istanbul University Cerrahpaşa Faculty of Medicine
Istanbul
Turkey (Türkiye)
Recruiting
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This page summarises publicly available registry data for informational purposes — not medical advice. Eligibility is determined by each study team; patients should discuss participation with their clinician.
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