Ultrasonographic measurement of antral area for estimating gastric fluid volume in pregnant women.
STUDY OBJECTIVE
To calculate the stomach volume according to the antral area in pregnant women.


DESIGN
Prospective observational study.


SETTING
One of the maternity units in our hospital.


PATIENTS
24 singleton pregnancy women, over 18-year-old, non-laboring, gestational age ≥ 36 weeks, ASA physical status I to II were involved in our study.


INTERVENTIONS AND MEASUREMENTS
An ultrasound assessment of the antrum was performed to the pregnant women after 8 hours fasting for the first time. Those lacking of visualization of any gastric contents in the antrum in both the supine and the right lateral decubitus positions were included in our study. Thereafter 50 ml of water was ingested, 4 times, 200 ml in total. The antrum area was examined 2mins after each 50 ml ingest of water.


MAIN RESULTS
A high correlation between CSA and volume of liquid ingested (r = 0.90,P < 0.01) was found. We can construct a formula for the prediction of volume values based on the measured CSA values and demographic variables. The equation is: Volumeml=270.76+13.68∗CSA-1.20∗gestationalage CONCLUSIONS: Bedside antrum area examination by ultrasonography can provide quantitative information for the assessment of the gastric content and volume in the pregnant women. We can calculate the actual stomach capacity according to the CSA of the gastric antrum.
['Chen|Xiubin|X|', 'Chen|Fenghua|F|', 'Zhao|Qingsong|Q|', 'Zhang|Lina|L|', 'Liu|Zhiqiang|Z|']
D000328:Adult D005240:Feasibility Studies D005260:Female D005766:Gastrointestinal Contents D006801:Humans D011247:Pregnancy D011446:Prospective Studies D011706:Pyloric Antrum D014463:Ultrasonography
Ultrasound Antrum area Gastric content and volume Pregnant woman