11.   The amplitude was measured from the midrespiratory basal pressure level to the peak of the pressure wave.

12.   The onset of the pressure wave was the point where the tangent of the sudden upstroke of the wave crossed the basal pressure.

13.   These repetitive simultaneous pressure waves usually occurred together with the lower oesophageal sphincter component of the migrating motor complex.

14.   According to our data, non-deglutitive repetitive simultaneous pressure waves may occur as a normal oesophageal motor pattern.

15.   Morphology of individual colonic pressure waves has eluded reliable classification.

16.   This has the advantage of being expressed as a number and is thus amenable to statistical analysis, but it does not recognise different types of colonic pressure waves.

17.   The frequency of the pressure waves remained unchanged.

18.   Gastro-oesophageal reflux of gas resulted in a peculiar manometric pattern consisting of repetitive peristaltic pressure waves that were not related to swallowing.

19.   We call this the breathing pressure wave.

20.   In the Great Lakes, a weak low pressure wave will promote clouds and showers.