Effects of Spontaneous Breathing Activity on Atelectasis Formation During General Anaesthesia (SBAFGA)
Atelectasis
About this trial
This is an interventional supportive care trial for Atelectasis focused on measuring Ventilation, General Anesthesia, electrical impedance tomography, pressure support, spontaneous breathing, laryngeal mask, Patients who are scheduled for elective knee or ankle surgery
Eligibility Criteria
Inclusion Criteria:
- Patients (age 18-65) scheduled for elective knee or ankle surgery under general anaesthesia with an LMA with an expected duration of at least 60 minutes.
Exclusion Criteria:
- Pregnancy,
- Pulmonary diseases (e.g. Asthma, COPD),
- Implanted pacemaker or AICD,
- Inability to communicate or understand the risks of the study,
- Contraindications for an LMA (e.g. obesity, reflux),
- Deformities of the thorax,
- Failure to place an LMA.
Sites / Locations
- University Hospital Carl-Gustav-Carus
Arms of the Study
Arm 1
Arm 2
Arm 3
Other
Other
Other
Spontaneous Breathing
Pressure controlled ventilation
Pressure Support Ventilation
Patients will be breathing spontaneously during anesthesia
Patients in the PPV group will be ventilated by pressure control (tidal volume 8-10 ml/kg, frequency 10-14, I:E 1:1, no PEEP, target CO2 4.5 kPa).
The patients in the PSV group will breathing spontaneously on the ventilator with assistance by inspiratory support pressure. The support pressure will be adjusted to achieve a tidal volume of 8-10 ml/kg.