1. Intestinal gas dynamics and tolerance in humans
Jordi Serra, Fernando Azpiroz, Juan–R. Malagelada 
Gastroenterology 
Volume 115, Issue 3, Pages (September 1998)
DOI: /S (98)
Copyright © 1998 American Gastroenterological Association Terms and Conditions

2. Fig. 1
Method. Gas was infused in the jejunum and collected via a cannula fitted in between the buttocks and connected to a barostat. Secretion drainage and gastric venting were controlled by separate channels.
Gastroenterology  , DOI: ( /S (98) )
Copyright © 1998 American Gastroenterological Association Terms and Conditions

3. Fig. 2
Gas evacuation during continuous intestinal infusion of gas; dose-response study in different groups of subjects (n = 6–12). ♢, 1 mL/min; ▵, 4 mL/min; ○, 12 mL/min; □, 30 mL/min. Dotted lines indicate infusion rates. Note that gas evacuation paralleled the infusion rates. Sham infusion group (0 mL/min) has been omitted for clarity. Values are means ± SE.
Gastroenterology  , DOI: ( /S (98) )
Copyright © 1998 American Gastroenterological Association Terms and Conditions

4. Fig. 3
Individual gas retention after 3-hour intestinal gas infusion. Retained gas is (Volume Infused) − (Volume Evacuated). Note that in all subjects except the 6 represented by solid symbols, total gas retention was within the ±400-mL range; 5 subjects (triangles) did not tolerate completion of the study.
Gastroenterology  , DOI: ( /S (98) )
Copyright © 1998 American Gastroenterological Association Terms and Conditions

5. Fig. 4
Gas retainers. Individual data from 6 subjects with >400 mL of gas retention. ▴, 4 mL/min (n = 2); ●, 12 mL/min (n = 1); ■, 30 mL/min (n = 3). Note progressive gas retention, perception, and abdominal distention during intestinal gas infusion.
Gastroenterology  , DOI: ( /S (98) )
Copyright © 1998 American Gastroenterological Association Terms and Conditions

6. Fig. 5
Individual perception scores after 3-hour intestinal gas infusion. Five subjects (triangles) did not tolerate completion of the study; the 6 subjects with >400 mL of gas retention are represented by solid symbols.
Gastroenterology  , DOI: ( /S (98) )
Copyright © 1998 American Gastroenterological Association Terms and Conditions

7. Fig. 6
Individual abdominal distention after 3-hour intestinal gas infusion. Five subjects (triangles) did not tolerate completion of the study; the 6 subjects with >400 mL of gas retention are represented by solid symbols.
Gastroenterology  , DOI: ( /S (98) )
Copyright © 1998 American Gastroenterological Association Terms and Conditions

8. Fig. 7
Intestinal gas clearance. SF6 clearance related to gas evacuation at the different determinations during the studies. ▵, 4 mL/min (n = 3); ○, 12 mL/min (n =3); □, 30 mL/min (n = 4); determinations at the end of each study are represented by solid symbols. Data from 4 subjects who retained gas are not represented.
Gastroenterology  , DOI: ( /S (98) )
Copyright © 1998 American Gastroenterological Association Terms and Conditions