Spatial variation in parameters of intragastric acidity
| Parameter | pH sensor | ||
|---|---|---|---|
| Gastric 1 (3 cm) | Gastric 2 (6 cm) | Gastric 3 (9 cm) | |
| Data presented as mean (SE). | |||
| *p < 0.05, **p < 0.005, ***p < 0.0005 compared with gastric 1. | |||
| †p < 0.05 compared with gastric 2. | |||
| Baseline pH (before feed) | 2.6 (0.4) | 1.8 (0.2) | 2.1 (0.3) |
| Maximum pH (after feed) | 7.3 (0.2) | 6.8 (0.1)* | 6.6 (0.3)* |
| Minimum pH (after feed) | 1.4 (0.2) | 1.1 (0.1) | 1.3 (0.1) |
| Time to reach maximum pH (min) | 35 (3) | 24 (2)** | 29 (3) |
| Time to reach minimum pH (min) | 197 (7) | 161 (10)** | 164 (12)* |
| Time to reach pH 4 (min) | 136 (7) | 91 (8)*** | 82 (9)** |
| Mean pH | |||
| 0–1 hours | 6.9 (0.2) | 6.0 (0.2) | 5.7 (0.4) |
| 1–2 hours | 6.0 (0.2) | 3.5 (0.4)*** | 3.7 (0.4)*** |
| 2–3 hours | 2.8 (0.3) | 2.0 (0.3)** | 2.7 (0.3)† |
| 3–4 hours | 1.9 (0.3) | 1.8 (0.3) | 3.1 (0.5)*† |