"Nabasynth" was spelled in on-screen subtitles ("Closed Caption"). With House's pretend pronouncement of Ortoli Syndrome and Nabasyth, Chase's reactions were, respectively, "Are you sure?" and, "What?" This prompted a repeat (oral and sub-title) of "Nabasynth." Nabasyth is presumed to be a placebo 'drug.'
Ortoli Syndrome is the name of a fictional genetic disease that causes erratic activity of the adrenal glands, which can lead to abrupt heart attacks. There is no such disease in existence and House mentioned the disease solely to have a fake diagnosis in order to be able to send a patient home. He prescribed Nabasynth, another fictional creation by House to send the patient home.