The risk of pulmonary aspiration of gastric contents remains a significant risk during anesthesia, especially in pregnant women, as they may often require surgery without having observed appropriate fasting. A bedside ultrasound assessment of the status of the gastric content would be of great value for the clinician.

This prospective observational study aimed to (1) qualitatively and quantitatively describe the sonographic appearance of the gastric antrum in fasted high-risk pregnant women during the third trimester and (2) evaluate the relationship between demographic and clinical variables and the gastric antral cross-sectional area (CSA).

The aim of this prospective study is to provide a qualitative and quantitative description of the sonographic appearance of the gastric antrum in fasted high-risk pregnant women in the 3rd trimester.

The investigators expect that the information obtained from the systematic ultrasonographic qualitative/quantitative assessment of the gastric content may help anesthesiologist to better assess aspiration risk and guide anesthetic and airway management, particularly in pregnant women scheduled for elective Cesarean delivery after standard preoperative fasting guidelines.

Inclusion Criteria:

1. Non-labouring pregnant women at 3rd trimester (≥ 28 weeks)
2. 18 years or older.
3. ASA physical status I-III
4. Hospitilized in High Risk Pregnancy Department
5. Ability to understand the rationale of the study assessments and provide signed informed consent.
6. Written informed consent

Exclusion Criteria:

1. Patients with American Society of Anesthesiology (ASA) physical status class IV.
2. Patient age < 18 years
3. Pregnant patients with upper gastrointestinal (GI) disease and pathology.
4. History of upper GI tract surgical procedures.
5. History of medications that affect gastrointestinal motility.
6. Inability to understand the rationale of the study assessments and provide signed informed consent.

Fasted (6h solids, 2h fluids) high-risk pregnant women at 3rd trimester

We do not plan to share individual participant data due to a specific request from our institution, which prioritises maintaining the confidentiality and privacy of patient information. The hospital's data-sharing policies and regulatory constraints are designed to safeguard sensitive health data and prevent potential risks of participant re-identification, even after anonymisation.