Effects of Laparoscopic Ovarian Drilling in Treating Infertile Anovulatory
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Effects of laparoscopic ovarian drilling in treating ORIGINAL ARTICLE infertile anovulatory polycystic ovarian syndrome patients with and without metabolic syndrome Grace WS Kong 江穎珊 Objective To compare the effects of laparoscopic ovarian drilling in LP Cheung 張麗冰 treating infertile polycystic ovarian syndrome in patients with 駱 紅 Ingrid H Lok and without metabolic syndrome. Design Retrospective review. Setting A university-affiliated hospital in Hong Kong. Patients A total of 89 infertile anovulatory polycystic ovarian syndrome patients, who underwent laparoscopic ovarian drilling with completed metabolic screening and seen over a 5-year period from 2002 to 2007. Main outcome measures The clinical, hormonal, and metabolic characteristics as well as spontaneous ovulation rates, reproductive outcomes, and diabetes risks during pregnancy observed after laparoscopic ovarian drilling. Results Approximately one fifth (21%) of polycystic ovarian syndrome patients had the metabolic syndrome. There were no differences in spontaneous ovulation rates (68% vs 61%, P=0.76), cumulative pregnancy rates (68% vs 61%, P=0.77), and diabetes risks during pregnancy (64% vs 42%, P=0.13) between patients with and without metabolic syndrome. Conclusion Laparoscopic ovarian drilling was equally effective in inducing ovulation in polycystic ovarian syndrome patients with metabolic syndrome. Thus, patients with metabolic syndrome should not be precluded from laparoscopic ovarian drilling, which has the additional advantage of enabling full tubo-peritoneal assessment at the same time. Introduction Polycystic ovarian syndrome (PCOS) is the most common reproductive endocrinopathy affecting 6 to 12% of women during their reproductive age.1,2 It is also the major cause of anovulatory infertility.3 The first-line treatment of anovulatory infertility in PCOS patients is clomiphene citrate.3-5 Laparoscopic ovarian drilling (LOD) has been shown to be an effective means of inducing ovulation in these patients when clomiphene citrate fails.5,6 Polycystic ovarian syndrome has diverse phenotypes whose aetiology remains unclear. Hyperandrogenism mediated through elevated luteinising hormone (LH) Key words Diabetes mellitus, type 2; [endocrine pathway] and/or insulin resistance (metabolic pathway), which are both Hyperandrogenism; Infertility, female; important pathophysiological features but the relative contribution of these pathways Metabolic syndrome X; Polycystic ovary to the disease mechanism varies in different subjects, which possibly accounts for syndrome; its clinical heterogeneity.7,8 Emerging evidence suggests that a significant proportion of 9 10,11 12,13 Hong Kong Med J 2011;17:5-10 PCOS patients have central obesity, glucose intolerance, atherogenic dyslipidaemia and hypertension,14 which contribute to the development of metabolic syndrome (MetS). According to our earlier study,15 patients with PCOS had a 5-fold increased risk of Department of Obstetrics and developing MetS. Gynaecology, The Chinese University of Hong Kong, Prince of Wales Hospital, While LOD seems to be more effective in inducing ovulation in LH-predominant Shatin, Hong Kong 6 16 GWS Kong, MRCOG patients, after the procedure, both LH and androgen levels decrease but there is no 17-19 LP Cheung, FRCOG impact on metabolic parameters (including plasma glucose, insulin, and lipid levels). IH Lok, MD In addition, LOD was noted to be less effective in inducing ovulation in obese PCOS 20 Correspondence to: Dr GWS Kong women. It was therefore unclear as to whether LOD would work effectively in PCOS Email: [email protected] patients with MetS. Hong Kong Med J Vol 17 No 1 # February 2011 # www.hkmj.org 5 # Kong et al # in the lower abdomen. A pair of grasping forceps was 腹腔鏡卵巢打孔術治療有或無新陳代謝症 used to hold the ovarian ligament for manipulation 候群的多囊卵巢綜合徵無排卵性不孕患者 of the ovary; a laparoscopic ovarian diathermy was introduced via the 5-mm port for drilling. A 的成效 laparoscopic ovarian diathermy needle with a distal 目的 比 較 有或無新陳代謝症候群的多囊卵巢綜合徵 operating needle measuring 8 mm in length and 2 mm (PCOS)不孕患者,其腹腔鏡卵巢打孔術的治療成 in diameter was used with a standardised monopolar 效。 coagulation current set at 30 watts. The output waveform of the current had a nominal frequency of 設計 回顧研究。 500 kHz and a maximum output of 99 watts at 300 Ω 安排 香港一所大學附屬醫院。 resistances. A total of 3 to 10 punctures 7 to 8 mm 患者 2002至2007年的5年期間,共89位PCOS無排卵性不 in depth were made in each ovary depending on its 孕患者接受腹腔鏡卵巢打孔術治療及代謝篩查。 size. Each penetration lasted 4 to 5 seconds.6,16 主要結果測量 臨床、激素和代謝特徵,以及接受治療後的自然排卵 率、妊娠情況和糖尿病風險。 Clinical, anthropometrical, and biochemical 結果 約有五分之一(21%)PCOS患者出現新陳代謝症 parameters 候群。將有新陳代謝症候群與無新陳代謝症候群 A standard data sheet was used to record the 兩組的結果比較,發現無論在自然排卵率( 68% personal, medical and drug histories; regularity and 比 , . )、累積妊娠率( 比 , 61% P=0 76 68% 61% length of the menstrual cycle; symptoms of hirsutism ),以及妊娠期間的糖尿病風險( 比 , P=0.77 64% 42% and acne; duration and cause of infertility and )都沒有顯著分別。 P=0.13 previous ovulation induction method and response. 結論 以腹腔鏡卵巢打孔術治療有新陳代謝症候群的PCOS Sitting blood pressure was measured after 5-minute 患者,同樣能有效地刺激排卵。所以這些患者不應被 rest using a standard sphygmomanometer. Body 抹剎接受上述治療的機會;患者也可於治療期間同時 weight, body height, and waist circumferences were 作全面的腹膜管檢查。 measured. Waist circumference was taken as the narrowest measurement midway between the top of iliac crest and the lower rib margin. Serum hormone assays were performed for This retrospective study aimed to compare the LH, follicle stimulating hormone (FSH), and total clinical, hormonal, and metabolic characteristics, testosterone using blood samples taken in the early as well as the reproductive outcomes after LOD in follicular phase (defined as day 2 to 3 of the menstrual PCOS patients with and without MetS. The primary cycle) or after progestogen-induced menstruation. outcome measure was the spontaneous ovulation The concentrations were measured using validated rate after LOD, and secondary outcome measures assays on an Immulite 1000 semi-automated were pregnancy outcomes and the diabetes risk immunoassay analyser (Diagnostic Products during pregnancy. Corporation, Los Angeles [CA], US) in our laboratory at the Department of Clinical Chemistry, Prince Methods of Wales Hospital. We defined LH predominance as elevated LH-to-FSH ratio of ≥2.5 or increased Patient selection basal concentration of LH to ≥10 IU/L. Biochemical All infertile Chinese PCOS patients who underwent hyperandrogenaemia was defined as elevated total LOD at the Prince of Wales Hospital, a university- testosterone of ≥3 nmol/L, which was the 97.5th affiliated hospital in Hong Kong, over a 5-year period percentile of the values of total testosterone of from 2002 to 2007 were reviewed. In our unit, LOD healthy women. Overnight fasting blood samples was offered to patients with PCOS according to the were taken on the same day as the hormonal assay Rotterdam consensus,21 so they had to have evidence for measurement of total cholesterol, triglycerides of chronic anovulation and sonographic appearance (TG), high-density lipoprotein cholesterol (HDL-C), of polycystic ovaries when undergoing laparoscopic low-density lipoprotein cholesterol, fasting plasma assessment for infertility. glucose (FPG), and fasting insulin. A 2-hour plasma glucose concentration was also determined as part of a 75 g oral glucose tolerance test (OGTT). Laparoscopic ovarian drilling All operations were performed by a designated team, which comprised two surgeons. The procedure in Metabolic syndrome our centre involved a three-puncture laparoscopy: Metabolic syndrome was defined according to the a 10-mm laparoscope was inserted via the primary AHA/NHLBI (American Heart Association and the sub-umbilical port, with two additional 5-mm ports National Heart, Lung and Blood Institute)–modified 6 Hong Kong Med J Vol 17 No 1 # February 2011 # www.hkmj.org # Ovarian drilling and metabolic syndrome # Adult Treatment Panel III criteria in 2005 (ATPIII Statistical Package for the Social Sciences (Windows 2005).22 This entailed co-occurrence of three or more version 16; SPSS Inc, Chicago [IL], US). Continuous of the following risk factors: variables were presented as mean (standard deviation [SD]) or median (interquartile range [IQR]), (1) Impaired fasting glucose (FPG ≥5.6 mmol/L) or impaired glucose tolerance after 75 g OGTT and analysed using independent sample t test for normally distributed data or Mann-Whitney U test for (2-hour plasma glucose ≥7.8 and <11.1 mmol/L) non-parametric variables. Categorical variables were or type II diabetes (FPG ≥7 mmol/L or 2-hour expressed as proportions (percentages) and analysed plasma glucose ≥11.1 mmol/L).23 by Chi squared or Fisher’s exact tests as appropriate. (2) Elevated systolic and/or diastolic blood pressure of ≥130/85 mm Hg. (3) Reduced fasting HDL-C of <1.3 mmol/L. Results (4) Elevated fasting TG of ≥1.7 mmol/L. (5) Central obesity with waist circumference of A total of 109 consecutive anovulatory infertile PCOS ≥80 cm in Asian women.24 In cases where waist Chinese patients underwent LOD over the 5-year circumference was not measured, a body mass study period with a median follow-up duration of 16 index (BMI) of 25 kg/m2 was used as a surrogate, (range, 8-26) months were examined. Twenty women which corresponded to a waist circumference of who had incomplete metabolic screening were 80 cm (r=0.92, P<0.001) in data derived from our excluded. There were no differences in the clinical previous studies.15,25 and biochemical characteristics between those