My sister is diagnosed wid abdominal tubetculosis 2 months back.since then she's on r-cinex,ethambutol,levoflox,pyridoxine.25 days back she started having vomiting after meals and acute abdominal pain.a ryle's tube had been put for her for two days to remove the gases trapped in intestines.since 3-4 days she again started to have this problem.doctor has adviced for a barium enema.my query is this test appropriate.what could be the causes for this repeated problem and what is management for the various possible findings that this test could give??