Published online by Cambridge University Press: 08 February 2018
The study of thyroid function as the uptake of radioiodine (I131) is a well-established test. Since the half-life of the isotope is long (8 days) it is unreasonable to make frequent repeated tests in the same person because of the cumulative radiation risk and the complexity of interpretation when residual radioactive iodine is still present in the body. However, in psychiatry daily or twice daily measurements of thyroid function might be very useful in studying patients who show sudden or rapid mental changes (Sands, 1958), and a radioiodine isotope with a half-life of only 2·26 hours which has become more readily available (I132), deserves trial. The primary aim of the present work was to make daily measurements on one man through several short (6-day) cycles of behavioural change. He was predominantly manic-depressive in type and has already been described in detail (Crammer, 1959). To discover how variable the measurement could be, repeated observations were also made on a group of 20 chronic male patients living together and showing an unchanging clinical picture. Observations were repeated on them after three months of chlorpromazine treatment to see whether this would have altered the values obtained for thyroid uptake.
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