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Plasma cyclic AMP (PcAMP) concentration and the excretion of cyclic AMP/dl GF were estimated in 11 thyrotoxic patients before and after medical treatment. PcAMP concentrations were significantly higher during hyperthyroidism (2.30 +/- 0.69 vs 1.88 +/- 0.71 nmol/dl; P less than 0.05), and total urinary cyclic AMP (TcAMP) excretion showed no significant changes (3.24 +/- 0.64 vs 3.44 +/- 1.77 nmol/dl GF). Nephrogenous (NcAMP) excretion rose significantly (1.00 +/- 0.82 vs 1.68 +/- 1.31 mmol/dl GF; P less than 0.025). The increase in NcAMP excretion correlated significantly with the decrease in serum T3 levels (r = -0.46; P less than 0.05). Serum iPTH levels showed no significant change. Both the serum Ca, corrected for serum total protein and TmPO4/GFR declined after treatment (respectively 2.44 +/- 0.13 vs 2.33 +/- 0.08 mmol/l; P less than 0.05 and 1.18 +/- 0.29 vs 1.05 +/- 0.22 mmol/l; P less than 0.05). It is concluded that the rise in NcAMP excretion corroborates the concept of increasing parathyroid activity following the treatment of hyperthyroidism.
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