Clinical and Gastroesophageal Reflux Characteristics Compared Between Patients With Positive and Negative pH Monitoring
| Characteristics | pH+ (n = 15) | pH– (n = 31) | |
|---|---|---|---|
| Age (yr) | 52.4 ± 12.1 | 45.0 ± 12.1 | 0.910 |
| Body mass index (kg/m2) | 24.2 ± 3.3 | 23.7 ± 4.5 | 0.743 |
| Hiatal hernia | 4 (26.7) | 8 (25.8) | 0.952 |
| Mean resting LESP (mmHg) | 22.6 ± 14.2 | 25.0 ± 14.0 | 0.600 |
| Major esophageal motility disorders | 1 (6.7) | 4 (12.9) | 0.705 |
| Ineffective esophageal motility | 11 (73.3) | 12 (38.7) | 0.067 |
| Recording duration, hours | 22.0 ± 0.8 | 22.4 ± 1.0 | 0.161 |
| % time pH < 4 at the distal esophagus | 7.8 (5.4-9.2) | 0.8 (0.2-1.5) | < 0.05 |
| GER episodes (times/day) | 44.1 ± 19.7 | 26.7 ± 14.6 | < 0.05 |
| % acid reflux | 41.8 ± 24.4 | 25.8 ± 16.6 | < 0.05 |
| Proximal extension (cm) from LES | 15.0 (9.0-15.0) | 9.0 (9.0-15.0) | 0.136 |
| Bolus contact time (sec) | 14.4 (12.2-19.8) | 12.1 (9.5-15.3) | 0.083 |
pH+, patients with positive pH monitoring; pH–, patients with negative pH monitoring; LESP, lower esophageal sphincter pressure; GER, gastroesophageal reflux; LES, lower esophageal sphincter.
Data are expressed as mean ± SD, n (%), or median (interquartile range).