• C Farquhar, P Vandekerckhove, M Arnot, and R Lilford.
• Department of Obstetrics and Gynaecology, National Women's Hospital, Claude Road, Epsom, Auckland, New Zealand, 1003. c.farquhar@auckland.ac.nz
• Cochrane Db Syst Rev. 2000 Jan 1 (2): CD001122.

BackgroundProblems in inducing ovulation in women with polycystic ovary syndrome (PCOS) and anovulation (failure to ovulate) are well recognised. Surgical ovarian wedge resection was the first established treatment for anovulatory PCOS patients but was largely abandoned of the risk of post-surgical adhesion formation. It was replaced by medical ovulation induction with clomiphene and gonadotrophins. However patients with PCOS treated with gonadotrophins often have a polyfollicular response and are exposed to the risks of ovarian hyperstimulation syndrome (OHSS) and multiple pregnancy. Although effective, it is an expensive, stressful and time consuming form of treatment requiring intensive monitoring. A new surgical therapy, laparoscopic ovarian "drilling", may avoid or reduce the need, or facilitate the use, of gonadotrophins for inducing ovulation. The procedure can be done on an outpatient basis with less trauma and fewer postoperative adhesions. It has been claimed in many uncontrolled observational studies that it is followed, at least temporarily, by a high rate of spontaneous postoperative ovulation and conception, or that subsequent medical ovulation induction becomes easier.ObjectivesTo determine the effectiveness of laparoscopic ovarian drilling for ovulation induction in subfertile women with anovulation (failure to ovulate) and polycystic ovarian syndrome (PCOS).Search StrategyThe search strategy of the Menstrual Disorders and Subfertility Group was used for the identification of randomised controlled trials (RCTS). A computerised MEDLINE search was used to identify non randomised controlled trials.Selection CriteriaTrials were eligible for inclusion if treatment consisted of laparoscopic ovarian drilling in order to induce ovulation in subfertile women with PCOS and compared with a concurrent control group.Data Collection And AnalysisFourteen trials were identified; eight were included in the review of which seven were randomised. All trials were assessed for quality criteria. The main studied outcomes were ovulation and pregnancy rates. Miscarriage rate, multiple pregnancy rate, and incidence of overstimulation and ovarian hyperstimulation syndrome rate were secondary outcomes.Main ResultsWith the exception of multiple pregnancy rates no differences were demonstrated for any of the interventions studied but the numbers of patients who have been randomised to controlled studies at this time is insufficient to conclude that laparoscopic ovarian drilling is more effective than gonadotrophin therapy for other outcomes.Reviewer's ConclusionsThe value of laparoscopic ovarian drilling as a primary treatment for subfertile patients with anovulation (failure to ovulate) and polycystic ovarian syndrome (PCOS) is undetermined. There is insufficient evidence to determine a difference in ovulation or pregnancy rates when compared to gonadotrophin therapy as a secondary treatment for clomiphene resistant women. Multiple pregnancy rates are reduced in those women who conceive following laparoscopic drilling. None of the studied modalities of drilling technique had any obvious advantages.

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