Transnasal Microstream EtCO2 Reduces Hypoxemia During Emergence in Aged Post-Abdomen Surgery
Effect of Transnasal Microstream Capnography on Incidence of Hypoxemia During Emergence From General Anesthesia in Elderly Patients After Abdominal Surgery: A Prospective Randomised Controlled Trial
調査の概要
状態
状態
条件
条件
介入・治療
介入・治療
詳細な説明
Study Title:
Effect of Transnasal Microstream End-Tidal Carbon Dioxide Monitoring on the Incidence of Postoperative Hypoxemia in Elderly Patients Undergoing Laparoscopic Surgery under General Anesthesia with Endotracheal Intubation: A Prospective, Randomized Controlled Study
Principal Investigator: Wu Jianbo Department: Anesthesiology and Perioperative Medicine
Background & Objective:
Postoperative hypoxemia is a common respiratory complication in the post-anesthesia care unit (PACU). Conventional pulse oximetry (SpO₂) has a delayed response to hypoventilation, especially during supplemental oxygen therapy. This study aims to investigate whether adding transnasal microstream end-tidal carbon dioxide (EtCO₂) monitoring in the PACU reduces the incidence of hypoxemia in elderly patients after laparoscopic surgery under general anesthesia.
Study Design:
Prospective, randomized, controlled, interventional study.
Participants:
324 elderly patients (age 65-80 years, ASA I-III, BMI 18-30 kg/m²) scheduled for elective laparoscopic surgery under general anesthesia with endotracheal intubation.
Interventions:
Control group (n=162): Routine monitoring with SpO₂ and clinical observation; oxygen delivery at 2 L/min via sampling line without EtCO₂ monitoring.
Experimental group (n=162): Same oxygen delivery plus continuous real-time transnasal microstream EtCO₂ monitoring.
Primary Outcome:
Incidence of postoperative hypoxemia (SpO₂ < 90% for >15 seconds) after extubation in the PACU.
Secondary Outcomes:
Incidence of severe hypoxemia (SpO₂ < 85% for >15 seconds) Lowest SpO₂ during PACU stay Vital signs at predefined time points
PACU length of stay (Steward Recovery Score ≥ 4)
Other adverse events (e.g., nausea, vomiting, agitation, shivering)
Safety Monitoring:
Device-related adverse events (nasal irritation, bleeding), respiratory events (bradypnea, apnea, airway obstruction), and serious adverse events (e.g., need for advanced airway, cardiovascular events) will be recorded and managed according to a stepwise intervention protocol.
Randomization and Blinding:
1:1 randomization using block randomization (SAS 9.4) with allocation concealment (sealed, opaque envelopes). Partial blinding: participants, outcome assessors, and statisticians blinded; anesthesiologists/operators unblinded.
Sample Size Calculation:
Based on pilot data (expected hypoxemia rate: 33% in control vs. 18% in experimental group), α=0.05, power=80%, plus 20% dropout → 162 patients per group (total N=324).
Statistical Analysis:
SPSS 22.0 will be used. Continuous variables (normal distribution) will be compared using t-test; non-normally distributed variables using Mann-Whitney U test. Categorical variables (e.g., hypoxemia incidence) will be compared using chi-square or Fisher's exact test.
Expected Significance:
This study will provide high-level evidence on whether transnasal microstream EtCO₂ monitoring in the PACU can enhance respiratory safety in elderly patients recovering from laparoscopic surgery, potentially reducing hypoxemia and related complications.
研究の種類
研究の種類
入学 (推定)
入学
段階
段階
- 適用できない
連絡先と場所
研究連絡先
研究連絡先
- 名前:Jianbo WU
- 電話番号:18560083793
- メール:jianbowu@sdu.edu.cn
参加基準
適格基準
適格基準
就学可能な年齢
- 高齢者
健康ボランティアの受け入れ
説明
Inclusion Criteria:
- Age 65-80 years;
- ASA physical status I-III;
- BMI 18-30 kg/m²;
- Participants scheduled for elective laparoscopic surgery under general anesthesia with endotracheal intubation;
- Willing to participate in the study and provide written informed consent
Exclusion Criteria:
- Patients with nasal bleeding, nasal mucosal injury, nasal cavity occupancy, or other conditions that preclude transnasal carbon dioxide monitoring;
- Patients undergoing emergency surgery;
- Participants requiring postoperative assisted ventilation via endotracheal intubation or tracheostomy;
- Presence of any disease or condition that may cause abnormal end-tidal carbon dioxide waveforms or abnormal baseline pulse oximetry (e.g., congenital heart disease or chronic lung disease);
- Severe cardiac insufficiency (≤4 Metabolic Equivalents [MetS]);
- Severe renal insufficiency (acute kidney injury [AKI] or chronic kidney disease [CKD] stage 4 or higher);
- Severe hepatic insufficiency (Child-Pugh class C or worse);
- Allergy to study medications;
- Daily alcohol intake ≥60 grams;
- History of psychiatric disorders such as depression, severe central nervous system depression, Parkinson's disease, basal ganglion lesions, schizophrenia, epilepsy, Alzheimer's disease;
- Participation in another related clinical study within the past 3 months.
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
- 主な目的:防止
- 割り当て:ランダム化
- 介入モデル:並列代入
- マスキング:トリプル
アーム数
武器と介入
参加者グループ / アーム参加者グループ / アーム |
介入・治療介入・治療 |
|---|---|
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アクティブコンパレータ:Control Group (Routine Monitoring Group)
After endotracheal extubation, the sampling end of the sampling line is placed between the patient's mouth and nose, and oxygen is delivered at 2 L/min via the sampling line.
The patient receives only routine monitoring (including continuous pulse oximetry and clinical observation) and is not connected to the end-tidal carbon dioxide (EtCO₂) monitoring device.
|
After extubation, the sampling line is placed between the patient's mouth and nose to deliver oxygen at 2 L/min.
The patient receives routine monitoring including continuous pulse oximetry (SpO₂) and clinical observation, but is not connected to the EtCO₂ monitoring device.
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実験的:Experimental Group (EtCO₂ Monitoring Group)
After endotracheal extubation, the sampling end of the sampling line is placed between the patient's mouth and nose, and oxygen is delivered at 2 L/min via the sampling line.
At the same time, the sampling line is connected to the monitor to initiate continuous real-time transnasal microstream end-tidal carbon dioxide monitoring.
|
After extubation, the sampling line is placed between the patient's mouth and nose to deliver oxygen at 2 L/min.
The sampling line is connected to a patient monitor (RespArrayTM) to initiate continuous real-time transnasal microstream end-tidal carbon dioxide (EtCO₂) monitoring throughout the post-anesthesia care unit (PACU) stay.
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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
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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Incidence of post-extubation hypoxemia (SpO₂ < 90% for >15 seconds)
時間枠:During the period in the post-anesthesia care unit (PACU) (up to 1 days)
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Closely monitor vital signs, and record the number of episodes of hypoxemia (defined as SpO₂ < 90% lasting for >15 seconds) following tracheal extubation after the patient is transferred from the operating room to the PACU.more
than 15 seconds
|
During the period in the post-anesthesia care unit (PACU) (up to 1 days)
|
二次結果の測定
二次結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
|
Incidence of severe hypoxemia: proportion of patients with SpO₂ < 85% lasting > 15 seconds
時間枠:During the period in the post-anesthesia care unit (PACU) (up to 1 days)
|
Closely monitor the patient's vital signs, and record the proportion of patients with severe hypoxemia (SpO₂ < 85% lasting >15 seconds) following tracheal extubation after transfer from the operating room to the PACU
|
During the period in the post-anesthesia care unit (PACU) (up to 1 days)
|
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Lowest SpO₂ value during PACU stay Lowest SpO₂ value during PACU stay Lowest SpO₂ value during PACU stay
時間枠:During the period in the post-anesthesia care unit (PACU) (up to 1 days)
|
Observe and record the lowest SpO₂ value during the patient's stay in the PACU
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During the period in the post-anesthesia care unit (PACU) (up to 1 days)
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PACU length of stay
時間枠:During the period in the post-anesthesia care unit (PACU) (up to 1 days)
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time from entering the PACU until achieving a Steward recovery score >4, meeting the criteria for discharge
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During the period in the post-anesthesia care unit (PACU) (up to 1 days)
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Other adverse events
時間枠:During the period in the post-anesthesia care unit (PACU) (up to 1 days)
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Record adverse events occurring during the entire PACU stay
|
During the period in the post-anesthesia care unit (PACU) (up to 1 days)
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Record the changes in heart rate following the patient's admission to the PACU
時間枠:During the period in the post-anesthesia care unit (PACU) (up to 1 days)
|
Record the patient's heart rate at T0 (on PACU admission), T1 (1 min post-extubation), T2 (5 min post-extubation), T3 (10 min post-extubation), T4 (15 min post-extubation), T5 (20 min post-extubation), and T6 (on PACU discharge)
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During the period in the post-anesthesia care unit (PACU) (up to 1 days)
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Record the patient's blood pressure after admission to the PACU
時間枠:During the period in the post-anesthesia care unit (PACU) (up to 1 days)
|
Record the patient's blood pressure values at T0 (on PACU admission), T1 (1 min post-extubation), T2 (5 min post-extubation), T3 (10 min post-extubation), T4 (15 min post-extubation), T5 (20 min post-extubation), and T6 (on PACU discharge)
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During the period in the post-anesthesia care unit (PACU) (up to 1 days)
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Record the changes in the patient's SpO₂ values after admission to the PACU
時間枠:During the period in the post-anesthesia care unit (PACU) (up to 1 days)
|
Record the patient's SpO₂ values at T0 (on PACU admission), T1 (1 min post-extubation), T2 (5 min post-extubation), T3 (10 min post-extubation), T4 (15 min post-extubation), T5 (20 min post-extubation), and T6 (on PACU discharge)
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During the period in the post-anesthesia care unit (PACU) (up to 1 days)
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協力者と研究者
捜査官
捜査官
- 主任研究者:Jianbo WU, Doctoral、Shandong First medical university
研究記録日
主要日程の研究
研究開始 (推定)
研究開始
一次修了 (推定)
一次修了
研究の完了 (推定)
研究の完了
試験登録日
最初に提出
最初に提出
QC基準を満たした最初の提出物
QC基準を満たした最初の提出物
最初の投稿 (実際)
最初の投稿
学習記録の更新
投稿された最後の更新 (実際)
投稿された最後の更新
QC基準を満たした最後の更新が送信されました
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
最終確認日
詳しくは
本研究に関する用語
その他の研究ID番号
その他の研究ID番号
- YXLL-KY-2026(147)
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