Gonadotrophin-releasing hormone antagonists in subfertile couples undergoing ovulation induction as part of an assisted conception program

Al-Inany HG, Youssef MAFM, Aboulghar M, Broekmans FJ, Sterrenburg MD., Smit JG, Abou-Setta AM

Published Online:

August 10, 2011

Gonadotrophin-releasing hormone (GnRH) analogues are used during stimulation of ovulation in order to prevent cycle cancellation secondary to a premature luteinizing hormone (LH) surge. The two main categories of analogues are agonists and antagonists. Both are frequently used in assisted reproduction programs. This updated review evaluated the efficacy and safety of GnRH antagonists compared to the more widely used protocol of GnRH agonists (long protocol). Forty-five randomised controlled studies were included and the pooled data showed that GnRH antagonist use leads to similar live-birth rates but a markedly lower incidence of severe ovarian hyperstimulation syndrome.

Abstract (click to read)

Background:

Gonadotrophin-releasing hormone (GnRH) antagonists can be used to prevent a luteinizing hormone (LH) surge during controlled ovarian hyperstimulation (COH) without the hypo-estrogenic side-effects, flare-up, or long down-regulation period associated with agonists. The antagonists directly and rapidly inhibit gonadotropin release within several hours through competitive binding to pituitary GnRH receptors. This property allows their use at any time during the follicular phase. Several different regimes have been described including multiple-dose fixed (0.25 mg daily from day six to seven of stimulation), multiple-dose flexible (0.25 mg daily when leading follicle is 14 to 15 mm), and single-dose (single administration of 3 mg on day 7 to 8 of stimulation) protocols, with or without the addition of an oral contraceptive pill. Further, women receiving antagonists have been shown to have a lower incidence of ovarian hyperstimulation syndrome (OHSS). Assuming comparable clinical outcomes for the antagonist and agonist protocols, these benefits would justify a change from the standard long agonist protocol to antagonist regimens. This is an update of a Cochrane review first published in 2001, and previously updated in 2006.

Objectives:

To evaluate the effectiveness and safety of gonadotrophin-releasing hormone (GnRH) antagonists compared with the standard long protocol of GnRH agonists for controlled ovarian hyperstimulation in assisted conception cycle

Search strategy:

We performed electronic searches of major databases, for example Cochrane Menstrual Disorders and Subfertility Group Specialised Register, CENTRAL, MEDLINE, EMBASE (from 1987 to April 2010); and handsearched bibliographies of relevant publications and reviews, and abstracts of major scientific meetings, for example the European Society of Human Reproduction and Embryology (ESHRE) and American Society for Reproductive Medicine (ASRM).

Selection criteria:

Two review authors independently screened the relevant citations for randomised controlled trials (RCTs) comparing different agonist versus antagonist protocols in women undergoing IVF or ICSI.

Data collection and analysis:

Two review authors independently assessed trial risk of bias and extracted data. If relevant data were missing or unclear, the authors were contacted for clarification.

Main results:

Forty-five RCTs (n = 7511) comparing the antagonist to the long agonist protocols fulfilled the inclusion criteria. There was no evidence of a statistically significant difference in rates of live-births (9 RCTs; odds ratio (OR) 0.86, 95% CI 0.69 to 1.08). There was a statistically significant lower incidence of OHSS in the GnRH antagonist group (29 RCTs; OR 0.43, 95% CI 0.33 to 0.57).

Authors' conclusions:

The use of antagonist compared with long GnRH agonist protocols was associated with a large reduction in OHSS and there was no evidence of a difference in live-birth rates.

This record should be cited as:

Al-Inany HG, Youssef MAFM, Aboulghar M, Broekmans FJ, Sterrenburg MD., Smit JG, Abou-Setta AM. Gonadotrophin-releasing hormone antagonists for assisted reproductive technology. Cochrane Database of Systematic Reviews 2011, Issue 5. Art. No.: CD001750. DOI: 10.1002/14651858.CD001750.pub3

Assessed as up to date:

March 1, 2010

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Primary Review Group:

Menstrual Disorders and Subfertility Group

Health topics:

Gynaecology > Subfertility > Female: assisted conception techniques

Cochrane Summaries^beta

Independent high-quality evidence for health care decision making

Gonadotrophin-releasing hormone antagonists in subfertile couples undergoing ovulation induction as part of an assisted conception program

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