Effectiveness of Detachment of the Breathing Circuit on the Rate of DLT Malposition After Postural Change

Exclusion Criteria

• •Mouth opening \<3cm;
• •History of previous difficult intubation;
• •Patients with diseases of the upper respiratory tract and main bronchi;
• •Cardiac insufficiency;
• •People with liver dysfunction;
• •Renal insufficiency;
• •Previous stroke;
• •Patients with severe obstructive ventilation dysfunction;
• •Bronchial asthma or airway hyperresponsiveness;
• •Patients who have participated in other clinical studies in the past 3 months.