Assessment of Renal Perfusion Using Ultrasound and Near-Infrared Spectroscopy in Patients Undergoing Minimally Invasive Abdominal Surgery (RRI-NIRS)
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.
調査の概要
詳細な説明
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
研究の種類
入学 (推定)
連絡先と場所
研究連絡先
- 名前：Lyudmila MARTYNENKO AYDOGDU, M.D.
- 電話番号：+90 5300613611
- メール：lyudmila.lylyly1@gmail.com
研究場所
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Istanbul、トルコ（Türkiye）、34320
- 募集
- Istanbul University Cerrahpasa Faculty of Medicine
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コンタクト：
- Lyudmila MARTYNENKO AYDOGDU, M.D.
- 電話番号：+90 5300613611
- メール：lyudmila.lylyly1@gmail.com
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参加基準
適格基準
就学可能な年齢
- 大人
- 高齢者
健康ボランティアの受け入れ
サンプリング方法
調査対象母集団
説明
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
研究計画
研究はどのように設計されていますか？
デザインの詳細
コホートと介入
グループ/コホート |
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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.
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この研究は何を測定していますか？
主要な結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
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Change in Renal Regional Oxygen Saturation Measured by NIRS
時間枠：after endotracheal intubation, immediately before extubation, and 1 hour after extubation
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Renal regional oxygen saturation (rSO₂) will be measured bilaterally using Near-Infrared Spectroscopy (NIRS).
NIRS values will be recorded at predefined perioperative time points.
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after endotracheal intubation, immediately before extubation, and 1 hour after extubation
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Change in Renal Resistive Index
時間枠：after endotracheal intubation, immediately before extubation, and 1 hour after extubation
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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.
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after endotracheal intubation, immediately before extubation, and 1 hour after extubation
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二次結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
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Relationship Between Renal Resistive Index and Renal Regional Oxygen Saturation
時間枠：after endotracheal intubation, immediately before extubation, and 1 hour after extubation
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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.
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after endotracheal intubation, immediately before extubation, and 1 hour after extubation
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協力者と研究者
研究記録日
主要日程の研究
研究開始 (実際)
一次修了 (推定)
研究の完了 (推定)
試験登録日
最初に提出
QC基準を満たした最初の提出物
最初の投稿 (実際)
学習記録の更新
投稿された最後の更新 (実際)
QC基準を満たした最後の更新が送信されました
最終確認日
詳しくは
本研究に関する用語
追加の関連 MeSH 用語
その他の研究ID番号
- CUC-RenalPerfusion-2026
個々の参加者データ (IPD) の計画
個々の参加者データ (IPD) を共有する予定はありますか?
IPD プランの説明
医薬品およびデバイス情報、研究文書
米国FDA規制医薬品の研究
米国FDA規制機器製品の研究
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