Positioning and Ultrasound Examination of the Gastric Antrum

Study Overview
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Brief Summary
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The aim of this prospective study was to assess the effect of patient positioning on the ultrasound assessment of gastric contents.

Official Title
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Effect of Positioning on Ultrasound Examination of the Gastric Antrum

Conditions
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Gastric Ultrasound

Intervention / Treatment
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* Behavioral: 6 hours fasting and free oral intake of water


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: ASA 1 and 2 volunteers Exclusion Criteria: Diabetes mellitus previous gastrointestinal surgery Medication affecting gastric motility digestive diseases, gastroparesis Pregnancy

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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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Diagnostic
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Sham Comparator: Supine position<br>patient in supine position, lying on the back, turned in the right lateral decubitus and turned in the left lateral decubitus in a randomized way, after prolonged fasting and 10 min after free oral intake of water | Behavioral: 6 hours fasting and free oral intake of water<br>* Ultrasound examination of the gastric antrum are performed in volunteers after prolonged fasting and 10 min after oral intake of water. Volunteer should be lying on his/her back, right lateral decubitus position and left lateral decubitus position with randomization of the order.<br>|
| Sham Comparator: 30° semirecumbent position<br>patient in semirecumbent position (head of the bed elevated to 30°), lying on the back, turned in the right lateral decubitus and turned in the left lateral decubitus in a randomized way, after prolonged fasting and 10 min after free oral intake of water | Behavioral: 6 hours fasting and free oral intake of water<br>* Ultrasound examination of the gastric antrum are performed in volunteers after prolonged fasting and 10 min after oral intake of water. Volunteer should be lying on his/her back, right lateral decubitus position and left lateral decubitus position with randomization of the order.<br>|
| Sham Comparator: 45° semirecumbent position<br>patient in semirecumbent position (head of the bed elevated to 45°), lying on the back, turned in the right lateral decubitus and turned in the left lateral decubitus in a randomized way, after prolonged fasting and 10 min after free oral intake of water | Behavioral: 6 hours fasting and free oral intake of water<br>* Ultrasound examination of the gastric antrum are performed in volunteers after prolonged fasting and 10 min after oral intake of water. Volunteer should be lying on his/her back, right lateral decubitus position and left lateral decubitus position with randomization of the order.<br>|
| Sham Comparator: 90° semirecumbent position<br>patient in semirecumbent position (head of the bed elevated to 90°), lying on the back, after prolonged fasting and 10 min after free oral intake of water | Behavioral: 6 hours fasting and free oral intake of water<br>* Ultrasound examination of the gastric antrum are performed in volunteers after prolonged fasting and 10 min after oral intake of water. Volunteer should be lying on his/her back, right lateral decubitus position and left lateral decubitus position with randomization of the order.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in ultrasound measurement of the antral cross sectional area according to the position | Ultrasound measurement of antral cross-sectional area | through study completion, an average of 20 min | 
| Change in qualitative ultrasound assessment of gastric contents according to the position | qualitative ultrasound assessment of gastric contents | through study completion, an average of 20 min |