61.   Periodically these patients usually undergo procedures known as cystoscopies in which a tube is inserted through the urethra to examine the bladder.

62.   Researchers say there is new evidence that sickle cell patients undergo changes in the blood vessels in their brains early in life that may presage stroke or other complications.

63.   Some patients have undergone the balloon treatment as many as five times, said Willerson.

64.   Some demand that the patient have undergone only certain treatments prior to receiving the experimental drug.

65.   Some older patients receive bone-marrow transplants in which their own stem cells are removed and then returned after the patient has undergone intensive chemotherapy and radiation.

66.   Some patients undergo leg amputations due to diabetes-related nerve damage.

67.   That would allow patients to undergo stronger chemotherapy without destroying their immune systems or requiring bone marrow transplants.

68.   The cells are banked before the patient undergoes chemotherapy and radiation, then reintroduced to the body and allowed to regenerate a fresh immune system.

69.   The drastic chemical changes the patient undergoes can also cause heart and respiratory problems, addiction specialists say.

70.   The device is expected to be safer than conventional models, because the electrical wires in regular pacemakers heat up when a patient undergoes an magnetic resonance imaging scan.