THALLOUS CHLORIDE TL-201 MAY BE USEFUL IN MYOCARDIAL PERFUSION IMAGING FOR THE DIAGNOSIS AND LOCALIZATION OF MYOCARDIAL INFARCTION. IT MAY ALSO HAVE PROGNOSTIC VALUE REGARDING SURVIVAL.
IS INDICATED ALSO FOR THE LOCALIZATION OF SITES OF PARATHYROID HYPERACTIVITY IN PATIENTS WITH ELEVATED SERUM CALCIUM AND PARATHYROID HORMONE LEVELS. IT MAY ALSO BE USEFUL IN PREOPERATIVE SCREENING TO LOCALIZE EXTRATHYROIDAL AND MEDIASTINAL SITES OF PARATHYROID HYPERACTIVITY AND FOR POSTSURGICAL REEXAMINATION.
THE RECOMMENDED ADULT DOSE OF INTRAVENOUS THALLOUS CHLORIDE TL-201 FOR PLANAR MYOCARDIAL IMAGING IS 37 TO 74 MBQ (1 TO 2 MCI). THE RECOMMENDED INTRAVENOUS DOSES FOR SPECT MYOCARDIAL IMAGING ARE 74 TO 111 MBQ (2 TO 3 MCI).
FOR THE LOCALIZATION OF PARATHYROID HYPERACTIVITY, THALLOUS CHLORIDE TL-201 MAY BE ADMINISTERED BEFORE, WITH OR AFTER A MINIMAL DOSE OF A THYROID IMAGING AGENT SUCH AS SODIUM PERTECHNETATE TC 99M OR SODIUM IODIDE I-123 TO ENABLE THYROID SUBTRACTION IMAGING.
AFTER INTRAVENOUS ADMINISTRATION, THALLOUS CHLORIDE TL-201 CLEARS RAPIDLY FROM THE BLOOD WITH MAXIMAL CONCENTRATION BY NORMAL MYOCARDIUM OCCURRING AT ABOUT 10 MINUTES.