Ultrasound Detection of Position of Diaphragm During Laparoscopic Surgery

Study Overview
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Brief Summary
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Position of diaphragm in the region of electrical impedance tomography measurement is to be determined by ultrasound in approx. 20 patients undergoing laparoscopic surgery. Data are to be obtained at three phases at supine horizontal position (during spontaneous breathing, at mechanically ventilated patient under general anesthesia with muscle relaxation and at mechanically ventilated patient under general anesthesia with muscle relaxation during insufflation of carbon dioxide into the peritoneal cavity to achieve exposure during laparoscopic surgery).

Detailed Description
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During laparoscopic surgery, insufflation of carbon dioxide into the peritoneal cavity is conducted in order to optimize working space for surgeons. As a side effect, the abdominal pressure alters physiological thoraco-abdominal configuration and pushes the diaphragm and lungs cranially. Since lung image acquired by electrical impedance tomography (EIT) depends on the conditions within the thorax and abdomen, it is crucial to know the diaphragm position to analyze the effect of cranial shift of diaphragm on EIT images of the thorax. Presence of diaphragm in the region of EIT measurement is to be determined by ultrasound in approx. 20 patients undergoing laparoscopic surgery. Data are to be obtained at three phases at supine horizontal position (during spontaneous breathing, at mechanically ventilated patient under general anesthesia with muscle relaxation and at mechanically ventilated patient under general anesthesia with muscle relaxation during insufflation of carbon dioxide into the peritoneal cavity to achieve exposure during laparoscopic surgery). The results of this study will serve during design of a subsequent study dealing with optimization of EIT electrode belt position during laparoscopic surgery.

Official Title
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Ultrasound Detection of Presence of Diaphragm in the Region of Lung Monitoring Using Electrical Impedance Tomography During Laparoscopic Surgery

Conditions
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Laparoscopy

Intervention / Treatment
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* Other: Patients undergoing Laparoscopic Surgery


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: - patients undergoing abdominal laparoscopic surgery Exclusion Criteria: morbid obesity standard exclusion criteria for electrical impedance tomography according to the manufacturer

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Supportive Care
Intervention Model: Single Group Assignment
Interventional Model Description: Single group assignment. Approx. 20 patients during laparoscopic surgery with capnoperitoneum.
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Experimental group<br>Patients undergoing Laparoscopic Surgery | Other: Patients undergoing Laparoscopic Surgery<br>* Data are to be obtained at three phases at supine horizontal position (during spontaneous breathing, at mechanically ventilated patient under general anesthesia with muscle relaxation and at mechanically ventilated patient under general anesthesia with muscle relaxation during insufflation of carbon dioxide into the peritoneal cavity to achieve exposure during laparoscopic surgery).<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Position of Diaphragm Detected by Ultrasound | Measurement in midclavicular line | Within one laparoscopic surgery (1-3 hours) | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Diaphragm, EIT, Laparoscopy