Postoperative Pulmonary Atelectases
Conditions
Brief summary
Atelectases (collapsed lung areas) of 15-20% of total lung occur in up to 90% of patients who are anaesthetized and intubated. The goal of the present prospective study is to detect atelectatic areas in the perioperative period in the lungs of patients undergoing elective laparoscopic surgery non-invasively and without x-ray exposure. Results of lung ultrasound (LUS) as the experimental method will be compared to the results of Electrical Impedance Tomography (EIT) as the reference technique for the detection of atelectasis. A device for peripheral Oxygen saturation measurement (MASIMO Radical-8) will detect changes in ventilation. The investigators want to confirm or disprove former findings of the appearance of intraoperative atelectases and to prove that ultrasound is a valid tool for detection of atelectases.
Interventions
DEVICEUltrasound of the lungs
Ultrasound examination of the lungs
Electric impedance tomography (EIT) is a noninvasive tool based on the measurement of electrical impedance changes within the thorax and lung tissue during ventilation and depicts the regional changes in ventilation in real time. To use electric impedance tomography 16 electrodes are applied in a circular fashion around the patient's chest, typically at the level of the 7th intercostal space.
Sponsors
Medical University of Vienna
Study design
Observational model
CASE_ONLY
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
18 Years to 75 Years
Healthy volunteers
No
Inclusion criteria
* Male or female, * age 18 - 75 * BMI \< 30 * Laparoscopic operation
Exclusion criteria
* Pregnancy * Pulmonary infection * Chronic pulmonary diseases * Morbid Obesity
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Correlation between evidence of atelectasis in lung ultrasound and evidence of atelectasis in electric impedance tomography | on the day of laparoscopic surgery, expected average 2 hours in total | Measurements, requiring 5 minutes each, are performed before induction of anaesthesia, after intubation, immediately before extubation and immediately after extubation. Outcome measure: comparison of how often atelectases are detected by lung ultrasound (experimental method) versus by electric impedance tomography (standard method) |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| respiratory variability of oxygen saturation | on the day of laparoscopic surgery, expected average 2 hours in total | from induction of anaesthesia until extubation |
Countries
Austria
Outcome results
None listed