Evaluation of the Effect of Surgical Positions Under General Anesthesia on Postoperative Atelectasis Using Lung Ultrasonography
试验速览
- 阶段
- 不适用
- 状态
- 尚未招募
- 入组人数
- 100
- 试验地点
- 1
- 主要终点
- Modified Lung Ultrasound Score
研究概览
简要总结
The aim of this study is to prospectively evaluate the effect of surgical position on the development of postoperative atelectasis in patients undergoing surgery in supine, prone, lateral decubitus, and lithotomy positions using lung ultrasonography (LUS), and to investigate whether there is a difference between these positions.
详细描述
Study Groups: Patients will be divided into 4 groups according to the surgical position to be given during the operation:
- Group 1 (Supine, n=25)
- Group 2 (Prone, n=25)
- Group 3 (Lateral Decubitus, n=25)
- Group 4 (Lithotomy, n=25) All patients will receive standard anesthesia induction and maintenance with 1 mcg/kg fentanyl citrate, 2 mg/kg propofol, 0.6 mg/kg rocuronium intravenously, followed by maintenance with desfluran at a MAC of 0.8-1.2 (if necessary). Patient demographic data (age, gender, height, weight, BMI, ASA score, comorbidities) and intraoperative data (heart rate, SpO2, mean arterial pressure, duration of surgery, surgical position, applied PEEP level) will be recorded.
Lung Ultrasonography (LUS) Protocol: LUS evaluation, Dr. The ultrasound will be performed by Burak Ağar using a Mindray ultrasound device [Device brand/model and probe type, e.g., 3.5-5 MHz convex or 7-12 MHz linear probe]. LUS will be performed using a 12-zone protocol consisting of 6 standard zones (upper and lower quadrants of the anterior, lateral, and posterior regions) for both hemithoraxes. The evaluation will be performed at 3 different time points:
- Preoperative (T0): Immediately before anesthesia induction, in the supine position (Baseline).
- Postoperative (T1): Immediately before the patient is awakened, in the supine position.
- Postoperative (T2): 20 minutes after the patient is transferred to the PACU. MLUS Scoring: Each region will be scored between 0-3 according to lung ventilation (MLUS Score):
- 0 Points: Normal ventilation (presence of A-line, fewer than 3 B-lines)
- 1 Point: Minor ventilation loss (≥ 3 B-lines or subpleural consolidations ≤ 1 cm in diameter separated by a normal pleural line)
- 2 Points: Moderate ventilation loss (Multiple small subpleural consolidations ≤ 1 cm in diameter separated by multiple and converging B-lines or a thickened/irregular pleural line)
- 3 Points: Severe ventilation loss (At least one consolidation > 1 cm in diameter or subpleural consolidations > 1x2 cm in diameter) The total MLUS score will be obtained by summing the scores of the 12 regions (Minimum 0, Maximum 36). Atelectasis will be defined as "predisposition to atelectasis when each quadrant score is 2 or 3".
研究设计
- 研究类型
- Observational
- 观察模型
- Case Only
- 时间视角
- Prospective
入排标准
- 年龄范围
- 18 Years 至 80 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Being between 18-80 years of age
- •Having ASA I-III status
- •Planning elective surgery under general anesthesia
- •Agreeing to participate in the study and signing the consent form
排除标准
- •Patients requiring emergency surgery
- •Patients with ASA IV or higher
- •Presence of a known serious preoperative lung disease (COPD, Asthma, Pneumonia, Pleural effusion, Pneumothorax, Interstitial lung disease, Bronchiectasis, etc.)
- •History of neuromuscular disease
- •Body Mass Index (BMI) > 35 kg/m² (Morbid obesity)
- •Presence of chest wall deformity or skin lesions that would obstruct LUS imaging
- •Cases with an operative duration of less than 60 minutes or more than 300 minutes
- •Patients with a history of thoracotomy, sternotomy, or prior open thoracic surgery
- •Patients with alcohol or drug dependence
- •Patients with significant anemia
- •Patients who are pregnant or lactating
- •Patients who develop laryngospasm following extubation
- •Refusal to provide consent or inability to cooperate
研究组 & 干预措施
Group 1
Supine position
干预措施: lung ultrasound (Procedure)
group 2
prone position
干预措施: lung ultrasound (Procedure)
group 3
lateral decubitus
干预措施: lung ultrasound (Procedure)
Group 4
lithotomy
干预措施: lung ultrasound (Procedure)
结局指标
主要结局
Modified Lung Ultrasound Score
时间窗: 1. (T0):Immediately before anesthesia induction, in the supine position 2.(T1): Immediately before the patient is awakened, in the supine posit 3.(T2):Twenty minutes after the patient was admitted to the PACU (Post-Anesthesia Care Unit)
MLUS Scoring: Each region will be scored between 0-3 according to lung ventilation (MLUS Score): * 0 Points: Normal ventilation (presence of A-line, fewer than 3 B-lines) * 1 Point: Minor ventilation loss (≥ 3 B-lines or subpleural consolidations ≤ 1 cm in diameter separated by a normal pleural line) * 2 Points: Moderate ventilation loss (Multiple small subpleural consolidations ≤ 1 cm in diameter separated by multiple and converging B-lines or a thickened/irregular pleural line) * 3 Points: Severe ventilation loss (At least one consolidation \> 1 cm in diameter or subpleural consolidations \> 1x2 cm in diameter) The total MLUS score will be obtained by summing the scores of the 12 regions (Minimum 0, Maximum 36). Atelectasis will be defined as "predisposition to atelectasis when each quadrant score is 2 or 3"
次要结局
未报告次要终点
研究者
Oguz Gundogdu
Associate Professor
Cumhuriyet University