Impact of bolus volume on small intestinal intra-luminal impedance in healthy subjects |
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Authors: | Nam Q Nguyen Laura K Bryant Carly M Burgstad Robert J Fraser Daniel Sifrim Richard H Holloway |
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Institution: | Nam Q Nguyen, Carly M Burgstad, Richard H Holloway, Department of Gastroenterology & Hepatology, Royal Adelaide Hospital, Adelaide 5000, AustraliaLaura K Bryant, Robert J Fraser, Investigation and Procedures Unit, Repatriation General Hospital, Daw Park 5041, AustraliaDaniel Sifrim, Department of Medicine, Centre for Gastroenterological Research, K.U. Leuven, Leuven 3000, Belgium |
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Abstract: | AIM: To assess the impact of bolus volume on the characteristics of small intestinal (SI) impedance signals. METHODS: Concurrent SI manometry-impedance measurements were performed on 12 healthy volunteers to assess the pattern of proximal jejunal fluid bolus movement over a 14 cm-segment. Each subject was given 34 boluses of normal saline (volume from 1 to 30 mL) via the feeding tube placed immediately above the proximal margin of the studied segment. A bolus-induced impedance event occurred if there was > 12% impedance drop from baseline, over ≥ 3 consecutive segments within 10 s of bolus injection. A minor or major imped-ance event was defined as a duration of impedance drop < 60 s or ≥ 60 s, respectively.RESULTS: The minimum volume required for a detectable SI impedance event was 2 mL. A direct linear relationship between the SI bolus volume and the occurrence of impedance events was noted until SI bolus volume reached 10 mL, a volume which always produced an impedance flow event. There was a moderate correlation between the bolus volume and the duration of impedance drop ( r = 0.63, P < 0.0001) and the number of propagated channels ( r = 0.50, P < 0.0001).High volume boluses were associated with more major impedance events (≥ 10 mL boluses = 63%, 3 mL boluses = 17%, and < 3 mL boluses = 0%, P = 0.02).CONCLUSION: Bolus volume had an impact on the type and length of propagation of SI impedance events and a threshold of 2 mL is required to produce an event. |
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Keywords: | Bolus volume Health Impedance Luminal flow Small intestine |
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