None
Conditions
Interventions
S Group:During mask ventilation, the patient is placed in the conventional supine position with the head tilted backward (head extension) to align the mouth, pharynx, and larynx as close to a straight
L Group:During mask ventilation, the patient is positioned in the lateral decubitus position (left or right) according to surgical requirements. Based on the patient’s body build and height, the posit
Sponsors
General Hospital of Ningxia Medical University
Eligibility
Sex/Gender
All
Age
18 Years to 65 Years
Inclusion criteria
Inclusion criteria: 1. Age 18–65 years; 2. Both sexes; 3. Body mass index (BMI) 18.5–30 kg/m²; 4. ASA physical status classification I–III; 5. Patients scheduled for shoulder arthroscopy. 6. Ability to understand the study protocol and provide written informed consent.
Exclusion criteria
Exclusion criteria: 1. Patients with difficult airway; 2. Patients with congenital or acquired upper airway abnormalities; 3. Patients with obstructive sleep apnea; 4. Patients with cervical spine disease; 5. Patients with severe cardiopulmonary disease; 6. Patients who have undergone previous nasopharyngeal surgery.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| The degree of difficulty in mask ventilation; | — |
Secondary
| Measure | Time frame |
|---|---|
| Tidal volume (mL) at the first successful ventilation (appearance of PETCO2 waveform).;Peak inspiratory pressure (cm H2O) at the first successful ventilation (appearance of PETCO2 waveform).;Score for PETCO2 waveform quality.;Incidence of hypoxemia during mask ventilation (SpO2 10 seconds).;HR, MAP, and SpO2;Satisfaction score of the anesthesiologist with mask ventilation;Satisfaction scores of the surgeon and circulating nurse regarding the patient’s position before anesthesia induction.;Record the occurrence of adverse events, including: abdominal distension, severe hypoxemia (SpO2 < 85%), and the need for escalated airway intervention (emergency insertion of laryngeal mask airway or tracheal intubation under laryngoscopy).; | — |
Countries
China
Contacts
Public ContactWei Xiaoyong
General Hospital of Ningxia Medical University
Outcome results
None listed