41.   Before receiving t-PA, patients must undergo brain scans to rule out hemorrhagic strokes.

42.   Biopsies will be taken and patients will undergo various scans to look for evidence that the treatment is working.

43.   Bladder cancer patients undergo a procedure known as a cystoscopy to detect recurrence of disease.

44.   A month later the patients underwent biopsies and chest X-rays to determine whether the treatment had worked.

45.   Burn patients must still undergo several operations to cut away scar tissue that contorts their mouths or keeps their eyes permanently open or closed.

46.   But the patients with dementia underwent as many painful and invasive procedures as the other patients.

47.   Cancer patients undergo chemotherapy or radiation treatment that kills the white blood cells in the marrow, destroying the immune system.

48.   Drug bills are a major cost factor at a hospital such as M.D. Anderson, where patients undergo costly, complicated treatments.

49.   He persuades the patient to undergo more tests and to start taking high doses of medication.

50.   He suggested that the hospital might add this practice to a list of notices of procedures that patients might undergo.