Effects of Small-dose S-ketamine on Anesthesia-induced Atelectasis in Anesthetized Patients Accessed by Pulmonary Ultrasound

Early Phase 1UnknownNCT04745286

Beijing Tiantan Hospital100 enrolled

Overview

Background: Atelectasis occurs in the majority of patients with general anesthesia, which can lead to postoperative pulmonary complications (PPCs) and affect the postoperative outcome. However, there is still no exact method to prevent it though agents. S-ketamine may prevent atelectasis due to its airway smooth muscle relaxation and anti-inflammatory effects. Lung ultrasound is a portable and reliable bedside imaging technology for diagnosing anesthesia-induced atelectasis. Here, we intend to assess whether small-dose of S-ketamine can reduce the incidence of atelectasis after intubation under general anesthesia using lung ultrasound, in order to prevent the early formation of perioperative atelectasis and perioperative pulmonary complications. Methods: The trial is a single institution, prospective, randomized controlled, parallel grouping, double-blind study. From October 2021 to March 2022, 100 patients (18-60 years old) scheduled for elective surgery will be recruited from Beijing Tiantan Hospital, Capital Medical University, and randomly assigned to the S-ketamine group (Group S) and the normal saline group (Group N) at a ratio of 1:1. The label-masked agents will be given 5 minutes before induction and all patients will undergo a standardized general anesthesia protocol. Related data will be collected at three time point: after radial artery puncture (T1), 15 minutes after tracheal intubation (T2) and before extubation (T3). The primary outcome will be the total LUS scores at T2. Secondary outcomes include LUS scores in 6 chest regions at T2; total LUS scores at T3; arterial blood-gas analysis results (PaCO2, PaO2) and PaO2/FiO2 at T2 and T3, plateau pressure(Pplat) and dynamic lung compliance (Cdyn) at T2 and T3; the incidence of postoperative complications associated with S-ketamine and postoperative pulmonary complications (PPCs) 2 and 24 hours after surgery；. Discussion: This trial aims to explore whether a simple and feasible application of S-ketamine before the induction of general anesthesia can prevent atelectasis. The results of this study may provide new ideas and direct clinical evidence for the prevention and treatment of perioperative pulmonary complications during anesthesia. Key words: atelectasis, S-ketamine, ultrasound, RCT, protocol

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

Interventions

S-ketamineDRUG

Patients will receive the label-covered trial agent covered by the label after premedication 5 min before induction. Agent preparation method of S-ketamine group (Group S): Draw the dosage of S-ketamine 0.25mg ·kg -1 and dilute it with normal saline to 5ml in opaque 5-ml syringes.

normal saline groupDRUG

Patients will receive the label-covered trial agent covered by the label after premedication 5 min before induction. Normal saline group (Group N): 5ml of normal saline, labeled as "study agents".

Eligibility

Sex: ALLMin age: 18 YearsMax age: 60 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion Criteria: 1. Age of 18 - 60 years; 2. American Society of Anesthesiologists (ASA) physical status of I - II; 3. Patients scheduled for urinary, obstetrics and gynecology surgery in supine position or lithotomy position under general anesthesia, and the expected operation time is more than 1 hour; 4. Patients and their authorized surrogates have signed the informed consent form. Exclusion Criteria: 1. Patients who have difficulty in applying pulmonary ultrasound, such as chest fractures, surgical history, etc; 2. Patients who have a history of upper respiratory tract infection one month before surgery, or a history of smoking more than 6 packs/year; 3. Preoperative chest X-ray or CT abnormalities, including atelectasis, pneumothorax, pleural effusion or pneumonia; 4. BMI\>30kg/㎡; 5. Expected difficulty in intubation or mask ventilation; 6. Patients with significant increase in intraocular pressure and intracranial pressure before surgery; 7. Patients allergic to S-ketamine, propofol and opioids. 8. Patients with a positive history of psychiatric disorders.

Outcomes

Primary Outcomes

total lung sonography scores(LUS) scores at T2

Using SonoSite M-Turbo with a 5-12 MHz linear transducer,patients will be scanned and scored in the supine position following the lung ultrasound method described by Sun L and colleagues. Briefly, six regions will be scanned on in each hemithorax. Scans 1 and 2 will be performed at the midline of the clavicle, scans 3 and 4 will be performed in the axilla midline. The intercostal scans (Scans 5-6) will be performed in the fifth and sixth intercostal spaces of the posterior axillary line. Place a linear probe parallel to the ribs and scan the intercostal space of each region using a two-dimensional view sequentially from right to left, cranial to caudal, and anterior to posterior within 2 minutes.Each region will be categorised and assigned into four scores(0-3) based on B-lines.Add the scores in all twelve regions to get total lung sonography scores(LUS). Finally get a score between 0 (no atelectasis) and 36 (complete atelectasis).

Time frame: T2：at the time of tracheal intubation

Secondary Outcomes

LUS scores in 6 chest regions(scans 1-6) at T2

Using SonoSite M-Turbo with a 5-12 MHz linear transducer,patients will be scanned and scored in the supine position following the lung ultrasound method described by Sun L and colleagues. Briefly, six regions will be scanned on in each hemithorax. Scans 1 and 2 will be performed at the midline of the clavicle, scans 3 and 4 will be performed in the axilla midline. The intercostal scans (Scans 5-6) will be performed in the fifth and sixth intercostal spaces of the posterior axillary line. Place a linear probe parallel to the ribs and scan the intercostal space of each region using a two-dimensional view sequentially from right to left, cranial to caudal, and anterior to posterior within 2 minutes.Each region will be categorised and assigned into four scores(0-3) based on B-lines. Finally get six sets of data betweem 0(no atelectasis) and 6 (complete atelectasis).

Time frame: T2：at the time of tracheal intubation

total LUS scores at T3

Using SonoSite M-Turbo with a 5-12 MHz linear transducer,patients will be scanned and scored in the supine position following the lung ultrasound method described by Sun L and colleagues. Briefly, six regions will be scanned on in each hemithorax. Scans 1 and 2 will be performed at the midline of the clavicle, scans 3 and 4 will be performed in the axilla midline. The intercostal scans (Scans 5-6) will be performed in the fifth and sixth intercostal spaces of the posterior axillary line. Place a linear probe parallel to the ribs and scan the intercostal space of each region using a two-dimensional view sequentially from right to left, cranial to caudal, and anterior to posterior within 2 minutes.Each region will be categorised and assigned into four scores(0-3) based on B-lines. Finally get a score between 0 (no atelectasis) and 36 (complete atelectasis).

Time frame: T3：5min before extubation

arterial blood-gas analysis results (PaCO2, PaO2) and PaO2/FiO2 at T2 and T3

arterial blood samples will be obtained through radial artery puncture and blood-gas measurements will be performed immediately using a standard technique (ABL800) to get arterial blood-gas analysis results (PaCO2, PaO2) and PaO2/FiO2 at T2 and T3

Time frame: after tracheal intubation (T2) and 5min before extubation (T3)

plateau pressure and dynamic lung compliance (Cdyn) at T2 and T3

\[Cdyn = tidal volume/(PIP-PEEP)\]

Time frame: after tracheal intubation (T2) and 5min before extubation (T3)

the incidence of postoperative complications associated with S-ketamine 2 and 24 hours after surgery

visual impairment, dizziness, pathological irritability, nightmares and hallucinations

Time frame: 2 and 24 hours after surgery

the incidence of postoperative pulmonary complications (PPCs)

the clinical outcome defifinitions of PPCs will adopt European joint taskforce guidelines published in 2015 which include respiratory infection; respiratory failure; atelectasis; pleural effusion; pneumothorax; bronchospasm, aspiration pneumonia; pulmonary edema; ARDS; tracheobronchitis; pulmonary oedema; exacerbation of pre-existing lung disease; pulmonary embolism