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Assessment of Renal Perfusion Using Ultrasound and Near-Infrared Spectroscopy in Patients Undergoing Minimally Invasive Abdominal Surgery (RRI-NIRS)

3. juni 2026 opdateret af: Lyudmila Martynenko Aydogdu, Istanbul University - Cerrahpasa

Prospective Observational Evaluation of Renal Perfusion Using Doppler Ultrasonography and Near-Infrared Spectroscopy in Patients Undergoing Elective Minimally Invasive Abdominal Surgery

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.

Studieoversigt

Status

Rekruttering

Betingelser

Detaljeret beskrivelse

Minimally invasive abdominal surgery has become increasingly common because of reduced surgical trauma, faster recovery, and lower postoperative morbidity compared with conventional open surgery. However, laparoscopic procedures require the creation of pneumoperitoneum, which may increase intra-abdominal pressure and adversely affect renal blood flow, renal oxygen delivery, and kidney function.

Renal hypoperfusion during surgery may contribute to postoperative renal dysfunction and acute kidney injury (AKI). Traditional indicators of renal injury, such as serum creatinine and urine output, often fail to detect early changes in renal perfusion. Therefore, reliable non-invasive methods for real-time assessment of renal perfusion are needed.

Doppler ultrasonography-derived Renal Resistive Index (RRI) and Near-Infrared Spectroscopy (NIRS)-derived regional renal oxygen saturation (rSO₂) are promising techniques for evaluating renal perfusion and oxygenation. Both methods provide non-invasive, bedside assessment and may allow early detection of perfusion abnormalities before conventional markers become abnormal.

This prospective single-center observational study will evaluate perioperative renal perfusion in adult patients undergoing elective minimally invasive abdominal surgery. Renal perfusion measurements will be obtained using Doppler ultrasonography and NIRS at predefined perioperative time points, including after induction of anesthesia, during pneumoperitoneum, before extubation, and during the early postoperative period.

Demographic characteristics, comorbidities, baseline renal function, intraoperative hemodynamic variables, pneumoperitoneum duration and pressure, fluid administration, urine output, blood loss, ventilatory parameters, and postoperative renal function will be recorded. Associations between perioperative renal perfusion parameters and postoperative renal outcomes, including acute kidney injury, will be investigated.

The findings of this study may improve understanding of perioperative renal perfusion changes during minimally invasive abdominal surgery and contribute to the development of strategies for optimizing renal protection and perioperative patient management

Undersøgelsestype

Observationel

Tilmelding (Anslået)

51

Kontakter og lokationer

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Studiekontakt

Studiesteder

  • Tyrkiet (Türkiye)
      • Istanbul, Tyrkiet (Türkiye), 34320
        • Rekruttering
        • Istanbul University Cerrahpasa Faculty of Medicine
        • Kontakt:

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

  • Voksen
  • Ældre voksen

Tager imod sunde frivillige

Ingen

Prøveudtagningsmetode

Ikke-sandsynlighedsprøve

Studiebefolkning

Adult patients aged 18-80 years with ASA physical status I-III undergoing elective minimally invasive abdominal surgery at Istanbul University-Cerrahpaşa Faculty of Medicine. Patients will be prospectively evaluated for perioperative renal perfusion using Doppler ultrasonography and Near-Infrared Spectroscopy (NIRS).

Beskrivelse

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

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

Kohorter og interventioner

Gruppe / kohorte
Elective Minimally Invasive Abdominal Surgery Patients
Adult patients aged 18 to 80 years undergoing elective minimally invasive abdominal surgery under general anesthesia. Renal perfusion will be assessed perioperatively and postoperatively(postoperative 1. hour) using Doppler ultrasonography-derived Renal Resistive Index (RRI) and Near-Infrared Spectroscopy (NIRS)-derived regional renal oxygen saturation (rSO₂). Measurements will be performed at predefined perioperative time points and correlated with intraoperative variables, postoperative renal function, and the occurrence of acute kidney injury.

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Change in Renal Regional Oxygen Saturation Measured by NIRS
Tidsramme: 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.
after endotracheal intubation, immediately before extubation, and 1 hour after extubation
Change in Renal Resistive Index
Tidsramme: 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.
after endotracheal intubation, immediately before extubation, and 1 hour after extubation

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Relationship Between Renal Resistive Index and Renal Regional Oxygen Saturation
Tidsramme: after endotracheal intubation, immediately before extubation, and 1 hour after extubation
The relationship between renal Doppler ultrasonography-derived Renal Resistive Index (RRI) and NIRS-derived renal regional oxygen saturation (rSO₂) will be evaluated for the right and left kidneys at predefined perioperative measurement time points.
after endotracheal intubation, immediately before extubation, and 1 hour after extubation

Samarbejdspartnere og efterforskere

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Sponsor

Istanbul University - Cerrahpasa

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart (Faktiske)

7. januar 2026

Primær færdiggørelse (Anslået)

7. januar 2027

Studieafslutning (Anslået)

7. januar 2027

Datoer for studieregistrering

Først indsendt

3. juni 2026

Først indsendt, der opfyldte QC-kriterier

3. juni 2026

Først opslået (Faktiske)

9. juni 2026

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

9. juni 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

3. juni 2026

Sidst verificeret

1. juni 2026

Mere information

Begreber relateret til denne undersøgelse

Nøgleord

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • CUC-RenalPerfusion-2026

Plan for individuelle deltagerdata (IPD)

Planlægger du at dele individuelle deltagerdata (IPD)?

INGEN

IPD-planbeskrivelse

Individual participant data (IPD) will not be shared because the study was not designed with a data-sharing plan and participant confidentiality will be protected in accordance with institutional and ethical requirements.

Lægemiddel- og udstyrsoplysninger, undersøgelsesdokumenter

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