Using
a fixed Dynamic viscosity for Air, Water and Barium Sulphate,
only 3 measurements are done in calculation of Flow Index in
constipated patients:
1.
Mean Intrarectal pressure during defecation as measured using
computerized anorectal manometry.
2.
A.C. Length .
3.
A.C. Diameter.
Both
2 and 3 are measured in cm. from the lateral defecographic views
on a standard abdominal film.
A
flow index of 1cc/s. was taken as well as a cut off point between
obstructed defecation (flow < 1cc/s.) and unobstructed flow
in the absence of anatomical obstruction or excessively hard
stools during defecation.
