An observational study in Atelectasis, Postoperative, Cholecystitis; Gallstone and Pulmonary Atelectasis, sponsored by Ankara Ataturk Sanatorium Training and Research Hospital. Recruiting at 1 site in Turkey (Türkiye). Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-06-05.
Sponsored by Ankara Ataturk Sanatorium Training and Research Hospital · Observational
Detecting possible atelectasis and other respiratory problems that may develop immediately after extubation via lung ultrasonography can reduce pulmonary complications by performing necessary interventions such as oxygen support, respiratory exercises, mobilization, and non-invasive mechanical ventilation applications at an early stage. In addition, although low-flow anesthesia is frequently used in daily anesthesia practice, publications showing the effects of its use in laparoscopic cholecystectomy operations on pulmonary complications are limited. On this occasion, this study can be presented as a contribution to the literature.
Postoperative atelectasis is a common complication that can develop in all patients receiving general anesthesia. The frequency of atelectasis increases due to increased intraabdominal pressure, especially in laparoscopic surgeries performed with pneumoperitoneum. For this reason, in order to prevent postoperative complications related to the lungs, it is extremely important to recognize atelectasis at an early stage, as well as to recognize the mechanisms that will cause atelectasis and avoid them.
Lung ultrasonography (Lung USG) draws attention for the rapid, cheap, safe and reliable detection of postoperative atelectasis. The fact that it can be applied at the bedside and can be easily repeated makes this method valuable. In the literature and in daily practice, it is seen that anesthesiologists commonly apply inhalation anesthesia with different fresh gas flow (FGF) rates during general anesthesia.
As defined by Baker and Simionescu, in low-flow anesthesia, FGF varies between 0.5 and 1 liter per minute. It has been shown that all types of flow are safe with modern anesthesia machines.
This study aims to demonstrate the effect of low-flow anesthesia (LFA) on pulmonary complications and, in particular, atelectasis that may develop after laparoscopic cholecystectomy operations, using a non-invasive, rapidly applicable, and proven method such as Lung USG.
377 studies on the registry are indexed under Pulmonary Atelectasis; 93 are open to participants now.
This study's planned enrollment of 110 is above the median of 76 across 100 observational studies indexed under Pulmonary Atelectasis.
Browse Pulmonary Atelectasis studies →Ankara Ataturk Sanatorium Training and Research Hospital is the lead sponsor of 38 studies on the registry; 15 are open to participants now.
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All cases that meet the inclusion and exclusion criteria will be included in the study. Patients will be taken to the operating room after being preoperatively evaluated in the observation room. The patient's anesthetic management will be provided by another anesthesiologist who is not participating in the study and is responsible for the patient. Intraoperative data will be obtained from the patient's anesthesia follow-up form and the records of the anesthesia machine. When the patients arrive in the recovery room, postoperative ultrasonographic measurements and other evaluations will be performed and noted. This group will include patients who received general anesthesia using low-flow techniques during the intraoperative period.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
The anaesthetists’ scale of health before surgery: I is healthy, II has a mild illness that is under control, III a severe one, IV a severe illness that is a constant threat to life. V and VI are used for the critically ill and for organ donors.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
BMI (body mass index)
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ASA physical status
The anaesthetists’ scale of health before surgery: I is healthy, II has a mild illness that is under control, III a severe one, IV a severe illness that is a constant threat to life. V and VI are used for the critically ill and for organ donors.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
As this study is observational in nature, no interventions will be performed by the research team. The study will involve a single group, within which the incidence and prevalence of the outcomes will be assessed.
Other: No-intervention
No interventions will be performed by the research team.
incidence of postoperative atelectasis
Incidence of postoperative atelectasis determined by lung ultrasonography in patients undergoing laparoscopic cholecystectomy with low-flow anesthesia
Time frame: 1 hour peroperatively
incidence of other postoperative pulmonary complications
Other postoperative pulmonary complications that may develop and be detected by ultrasonography such as pneumothorax, pleural effusion, pulmonary edema
Time frame: 1 hour peroperatively
Plan to share: No
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Ankara Ataturk Sanatorium Training and Research Hospital