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プロラクチン産生下垂体腺腫(プロラクチノーマ)の術後のプロラクチン(PRL)分泌動態を分析し,プロラクチノーマに対する治療法の選択について検討した。経蝶形骨洞法により腺腫摘出を行った74例を対象とし,PRL基礎値,TRH負荷に対するPRL反応,妊娠時のPRL値など経過を追って検査した。そのうち61例では1年以上の長期follow-upを行った。術後PRL正常化例(20ng/ml以下)26例では,TRH負荷に対するPRL反応は手術直後より16例で改善し,反応不良例中5例でもfollow-upにより反応の回復をみた。再発は1年以上follow-upした正常化例19例中1例で認められ,TRHに対する反応不良例であった。術後PRL基礎値21〜50ng/mlの19例では,bromocriptineの追加投与を行ったが,そのうち7例では投与中止後も正常値を維持した。妊娠中のPRL値は,術後正常化例では比較的低値のままで,非正常化例ではbromocriptineの投与中止とともに妊娠初期から著明に上昇した。
術後正常化例では再発は少なく,TRH反応も正常化してくる。非正常化例でも比較的低値のものではbromocriptineの一時的な投与により持続的な正常化をみることがある。プロラクチノーマに対する根治的治療という点において,手術療法が最善かつ安全であると考える。
The author studied the dynamics of prolactin (PRL) secretion after adenomectomy, and considered the treatment for prolactinomas. The study group comprised a total of 74 patients with prolactinomas who underwent transsphenoidal surgery between 1979 and 1986, and 61 patients out of them were followed up more than one year. Post-operatively, hyperprolactinemia was cured (under 20 ng/ml) in 19 of 36 microadenomas (53%), and 7 of 38 macro-adenomas (18%). Pre-operatively, PRL response to TRH was blunt except 3 patients, but it reco-vered in 16 patients after surgery, and 5 more pa-tients during follow-up. Recurrence of hyperpro-lactinemia occured in only one of 19 patients who were followed up more than one year, and she was not a PRL responder to TRH. Bromocriptine was administrated to 46 patients after surgery, and hyperprolactinemia was restored to normal in 40 patients. And in 7 patients whose basal PRL le-vels were between 23 and 41 ng/ml after surgery, hyperprolactinemia was cured still after withdra-wal of bromocriptine. During pregnancy, PRL le-vels were relatively low in surgically cured pati-ents, but in most of others, they became over 200 ng/ml promptly after withdrawal of bromocriptine.
Recurrence of hyperprolactinemia was rare, and PRL response to TRH recovered in most of surgi-cally cured patients. Even if it is not cured sur-gically, lowered PRL levels have a good effect on the additional bromocriptine therapy. I prefer transsphenoidal surgery in respect of curative tre-atment for prolactinomas.
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