| 释义 |
‖ placenta prævia Med.|pləˈsɛntə ˈpriːvɪə|
Also placenta previa.
[mod.L., f. placenta + L. prævia, fem. of prævius going before.]
A placenta which partially or wholly blocks the neck of the uterus, thereby interfering with normal delivery of the baby; the condition of a placenta so positioned.
1820S. Merriman Synopsis Various Kinds of Difficult Parturition (ed. 3) 114 The hemorrhagies which accompany labour may be divided into three species. a. Accidental hemorrhage. Rigby... b. Unavoidable hemorrhage. Rigby. [Also known as] Hæmorrhagia placentâ præviâ. Boer. Menorrhagia à placentâ præviâ. Plenck. c. Atonic hemorrhage... The second from the unavoidable separation of the placenta, when that is unnaturally situated over the os uteri. 1858R. Barnes Physiol. & Treatm. Placenta Prævia i. 30 Dr. Legroux says, that placenta prævia mostly occurs in pluriparæ. 1917‘H. H. Richardson’ Fortunes R. Mahony ii. viii. 165 He re-lived those days when a skilfully handled case of placenta previa, or a successful delivery in the fourth position, had meant more to him than the Charge of the Light Brigade. 1943W. Shaw Textbk. Midwifery xvii. 315 The diagnosis of placenta prævia depends upon the palpation of the placenta within fingers' reach of the internal os. 1974Greenhill & Friedman Biol. Princ. & Mod. Pract. Obstetr. xxxvii. 418/1 In total placenta previa the bleeding usually occurs earlier than in partial placenta previa and is more profuse. |