First trimester termination of pregnancy. 2020

Man-Wa Lui, and Pak-Chung Ho
Department of Obstetrics and Gynaecology, The University of Hong Kong, Queen Mary Hospital, 6/F, Professorial Block, 102 Pokfulam Road, Hong Kong. Electronic address: ellenlui@hku.hk.

First trimester termination of pregnancy (TOP) is a safe and effective procedure. The complete abortion rates of surgical and medical abortion are approximately 97% and 95%, respectively. Vacuum aspiration (VA) either by electrical suction or manual aspiration is the method of choice for surgical TOP. Risk of significant bleeding is ≤ 5% in VA, while major complications occur in <1%. The risk of infection after VA can be reduced significantly by using prophylactic antibiotics or by the screen-and-treat strategy. Pre-operative administration of misoprostol can also reduce the risk of complications. The combination of 200 mg mifepristone followed by 800 μg misoprostol 24-48 h later is recommended for first trimester medical TOP. If mifepristone is not available, misoprostol can also be used alone, but repeated doses may be required and the complete abortion rate may be lower. Due to the reduced efficacy in more advanced gestation, repeated doses of misoprostol may be required for medical TOP over 9 weeks of gestation. The complete abortion rate with this regimen is 95% or more. Gastrointestinal upsets can occur in up to 50% of women, but major complications are rare. There was no lower limit of gestational week for TOP, although extra precaution is required for the confirmation of completion of procedures and exclusion of ectopic pregnancy.

UI MeSH Term Description Entries
D011247 Pregnancy The status during which female mammals carry their developing young (EMBRYOS or FETUSES) in utero before birth, beginning from FERTILIZATION to BIRTH. Gestation,Pregnancies
D011261 Pregnancy Trimester, First The beginning third of a human PREGNANCY, from the first day of the last normal menstrual period (MENSTRUATION) through the completion of 14 weeks (98 days) of gestation. Early Placental Phase,Pregnancy, First Trimester,Trimester, First,Early Placental Phases,First Pregnancy Trimester,First Pregnancy Trimesters,First Trimester,First Trimester Pregnancies,First Trimester Pregnancy,First Trimesters,Phase, Early Placental,Phases, Early Placental,Placental Phase, Early,Placental Phases, Early,Pregnancies, First Trimester,Pregnancy Trimesters, First,Trimesters, First
D005260 Female Females
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000019 Abortifacient Agents Chemical substances that interrupt pregnancy after implantation. Abortifacient Effect,Abortifacient Effects,Abortifacients,Contraceptive Agents, Postconception,Agents, Abortifacient,Agents, Postconception Contraceptive,Effect, Abortifacient,Effects, Abortifacient,Postconception Contraceptive Agents
D000028 Abortion, Induced Intentional removal of a fetus from the uterus by any of a number of techniques. (POPLINE, 1978) Embryotomy,Abortion (Induced),Abortion Failure,Abortion History,Abortion Rate,Abortion Technics,Abortion Techniques,Abortion, Drug-Induced,Abortion, Rivanol,Abortion, Saline-Solution,Abortion, Soap-Solution,Anti-Abortion Groups,Fertility Control, Postconception,Induced Abortion,Previous Abortion,Abortion Failures,Abortion Histories,Abortion Rates,Abortion Technic,Abortion Technique,Abortion, Drug Induced,Abortion, Previous,Abortion, Saline Solution,Abortion, Soap Solution,Abortions (Induced),Abortions, Drug-Induced,Abortions, Induced,Abortions, Previous,Abortions, Rivanol,Abortions, Saline-Solution,Abortions, Soap-Solution,Anti Abortion Groups,Anti-Abortion Group,Drug-Induced Abortion,Drug-Induced Abortions,Embryotomies,Failure, Abortion,Failures, Abortion,Group, Anti-Abortion,Groups, Anti-Abortion,Histories, Abortion,History, Abortion,Induced Abortions,Postconception Fertility Control,Previous Abortions,Rate, Abortion,Rates, Abortion,Rivanol Abortion,Rivanol Abortions,Saline-Solution Abortion,Saline-Solution Abortions,Soap-Solution Abortion,Soap-Solution Abortions,Technic, Abortion,Technics, Abortion,Technique, Abortion,Techniques, Abortion
D014620 Vacuum Extraction, Obstetrical Removal of the fetus from the uterus or vagina at or near the end of pregnancy with a metal traction cup that is attached to the fetus' head. Negative pressure is applied and traction is made on a chain passed through the suction tube. (From Stedman, 26th ed & Dorland, 28th ed) Delivery, Vacuum Extraction,Vacuum Extraction, Obstetric,Deliveries, Vacuum Extraction,Extraction Deliveries, Vacuum,Extraction Delivery, Vacuum,Extraction, Obstetric Vacuum,Extraction, Obstetrical Vacuum,Extractions, Obstetric Vacuum,Extractions, Obstetrical Vacuum,Obstetric Vacuum Extraction,Obstetric Vacuum Extractions,Obstetrical Vacuum Extraction,Obstetrical Vacuum Extractions,Vacuum Extraction Deliveries,Vacuum Extraction Delivery,Vacuum Extractions, Obstetric,Vacuum Extractions, Obstetrical
D015735 Mifepristone A progestational and glucocorticoid hormone antagonist. Its inhibition of progesterone induces bleeding during the luteal phase and in early pregnancy by releasing endogenous prostaglandins from the endometrium or decidua. As a glucocorticoid receptor antagonist, the drug has been used to treat hypercortisolism in patients with nonpituitary CUSHING SYNDROME. Mifegyne,Mifeprex,Mifégyne,R-38486,R38486,RU-38486,RU-486,ZK-98296,ZK98296,R 38486,RU 38486,RU 486,RU38486,RU486,ZK 98296
D016595 Misoprostol A synthetic analog of natural prostaglandin E1. It produces a dose-related inhibition of gastric acid and pepsin secretion, and enhances mucosal resistance to injury. It is an effective anti-ulcer agent and also has oxytocic properties. Apo-Misoprostol,Cytotec,Glefos,Misoprostol, (11alpha,13E)-Isomer,Misoprostol, (11alpha,13E,16R)-Isomer,Misoprostol, (11alpha,13Z)-(+-)-Isomer,Misoprostol, (11alpha.13E,16S)-Isomer,Misoprostol, (11beta,13E)-(+-)-Isomer,Misoprostol, (11beta,13E,16R)-Isomer,Misoprostol, (11beta,13E,16S)-Isomer,Novo-Misoprostol,SC-29333,SC-30249,Apo Misoprostol,Novo Misoprostol,SC 29333,SC 30249,SC29333,SC30249
D059408 Pain Management A form of therapy that employs a coordinated and interdisciplinary approach for easing the suffering and improving the quality of life of those experiencing pain. Management, Pain,Managements, Pain,Pain Managements

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