This offers an escape route for gas and fluid that may
have accumulated within the stomach. NG
intubation is also important for administering laxatives or fluids.
Bowel secretes fluid into its lumen in response to distension, thus the
volume of accumulated fluid relieved from the stomach via stomach tube can be
helpful in locating a lesion. The
nearer the obstruction to the stomach, the faster the fluid will accumulate.
If it re-accumulates rapidly, the problem is nearer the pylorus than in
cases where re-accumulation doesn’t occur at all or occurs very slowly.
It is essential to create a siphon in order to be able
to remove fluid through the stomach tube. This
is done by filling the tube with water and aspirating gently with a stomach pump
or syringe. Repeated efforts to create a siphon and to move the tube in
and out are essential since feed material from the stomach may obstruct the end
of the tube. The volume and pH of
the gastric fluid should be noted. One
should be aware that while not a surgical condition, small intestinal enteritis
may produce large volumes of fluid.