Gastric emptying evaluation by ultrasound prior colonoscopy: An easy tool following bowel preparation

Figure 1 Protocol schedule the day of the colonoscopy. NaP: Sodium phosphate bowel preparation.

Figure 2 Measurement of the surface antral by ultrasonography in a patient in right lateral position at baseline. A: Measurement after 12 h of gastric rest; B: Measurement after the ingestion of 750 mL water plus 12 tablets of NaP in 45 min showing a distortion of the antrum. NaP: Sodium phosphate bowel preparation.

Figure 3 Ultrasound method of assessing gastric emptying time based on measurements of gastric antrum. CSA: Cross sectional area.

Figure 4 Evaluation of gastric volume and residual volume using ultrasonography. A: Percent of patients with a residual antral volume above 20 mL at each time. Results are expressed in percent of the overall population (n = 27); B: Modification of the gastric volume. Results are expressed in mean ± SD of the overall population (n = 27).

Figure 5 Evolution of gastric volume. A: Evolution of gastric volume according to gender; B: Evolution of gastric volume according to body mass index; C: Evolution of gastric volume according to or smoking habits; D: Gastric emptying evolution considering the time when gastric volume returns to baseline (after 12 h fasting).