Table 6

Relationship between GRV with gastric meal retention and breath test

	ICU patients
	R² value	p Value
Scintigraphy
GRV and % retention at 60 min	0.5	<0.001
GRV and % retention at 120 min	0.66	<0.001
GRV and % retention at 180 min	0.73	<0.001
GRV and % retention at 240 min	0.77	<0.001
Breath test
GRV and BTt₅₀	0.72	<0.001
GRV and GEC	−0.46	0.003

BT, breath test; GE, gastric emptying; GEC, gastric emptying coefficient; GRV, gastric residual volume; t₅₀, half emptying time.