Table 4

Acid exposure values among asthmatics and controls
Controls Asthmatics with (−) GERD symptom score Asthmatics with (+) GERD symptom score All asthmatics*
Proximal sensor (n = 16) (n = 10) (n = 20) (n = 30)
Total time pH < 4 (%) 0.07 (0–0.4) 2.0 (0.2-10.6) 2.3 (0.03-50.9) 2.1 (0.04-29.7)
Upright time pH < 4 (%) 0.02 (0–0.4) 1.3 (0–24.0) 3.3 (0–66.3) 1.3 (0–44.0)
Supine time pH < 4 (%) 0.12 (0–0.5) 3.2 (0–17.8) 0.2 (0–34.6) 0.4 (0–25.9)
Total no. of reflux episodes 6.0 (0–25.0) 52.0 (3.0-193.0) 55.5 (0.2-233.0) 52 (1.6-233.0)
No. of episodes ≥ 5 min 0 (0–1.0) 2 (0–128.3) 3.5 (0–122.5) 3 (0–128.3)
Longest episode (min) 0.9 (0–7.8) 10.0 (1.0-155.4) 37.8 (0.06-205.7) 25.8 (0.07-189.4)
DeMeester score 0.95 (0.2-4.8) 23.4 (4.4-64.0) 22.3 (0.2-152.7) 23.4 (0.4-106.0)
Distal sensor (n = 26)
Total time pH < 4 (%) 0.4 (0.08-1.5) 6.3 (1.0-14.7) 7.9 (0.3-35.7) 7.4 (0.5-19.8)
Upright time pH < 4 (%) 0.2 (0–3.0) 6.5 (0–28.8) 4.0 (0–53.9) 4.9 (0.08-30.2)
Supine time pH < 4 (%) 0.4 (0.07-2.8) 4.6 (0.4-13.4) 2.7 (0.01-25.5) 3.0 (0.4-15.6)
Total no. of reflux episodes 18.0 (2.7-94.2) 33.5 (9.0-162.0) 65.5 (10.0-180.0) 43.5 (10.3-162)
No. of episodes ≥ 5 min 0 (0–2) 2.0 (1.0-9.0) 6.5 (0–15.7) 3.5 (1–9.4)
Longest episode (min) 1.9 (0.5-20.6) 12.8 (7.8-104.5) 27.5 (0.5-126.0) 20.1 (1.4-104.5)
DeMeester score 3.35 (0.7-11.5) 17.9 (5.4-55.6) 33.7 (2.2-131.0) 23.1 (5.4-61.2)

Values are median (range as 5th and 95th centiles).

Amarasiri et al.

Amarasiri et al. BMC Gastroenterology 2012 12:140   doi:10.1186/1471-230X-12-140

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