W N Lau

The University of Hong Kong, Hong Kong, Hong Kong

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Publications (5)11.03 Total impact

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    ABSTRACT: To compare the efficacy, side effects and acceptability of sublingual and vaginal misoprostol for second trimester medical abortion. Prospective randomised controlled trial. Tertiary referral unit and a teaching hospital. Two hundred and twenty-four women at 12 to 20 weeks of gestation. The women were randomised to receive either sublingual or vaginal misoprostol 400 microg every 3 hours for a maximum of five doses. The course of misoprostol was repeated if the woman did not abort within 24 hours. The success rate at 48 hours, induction-to-abortion interval and the side effects. There was no significant difference in the success rate at 48 hours (sublingual: 91%; vaginal: 95%). However, the success rate at 24 hours was significantly higher in the vaginal group (85%) compared with the sublingual group (64%). There was no difference in the median induction-to-abortion interval (sublingual: 13.8 hours; vaginal: 12.0 hours). Significantly more women in the sublingual group preferred the route to which they were assigned when compared with the vaginal group. The incidence of fever was also less in the sublingual group. The use of vaginal misoprostol for second trimester medical abortion resulted in a higher success rate than sublingual misoprostol at 24 hours but the abortion rate was similar at 48 hours. Vaginal misoprostol should be the regimen of choice but sublingual misoprostol is also an effective alternative.
    BJOG An International Journal of Obstetrics & Gynaecology 10/2004; 111(9):1001-5. · 3.76 Impact Factor
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    ABSTRACT: A randomized controlled trial comparing sublingual with vaginal administration of misoprostol for medical management of silent miscarriages. Eighty women who had silent miscarriages (<13 weeks) were randomized to receive 600 micro g of misoprostol every 3 h for a maximum of three doses either sublingually or vaginally. The success rates of medical management were the same in both groups (87.5%; 95% CI: 74-95%). There were no serious complications. The incidence of diarrhoea was higher in the sublingual (70%) than the vaginal route (27.5%) (P < 0.005). Other side effects were similar in each group, although fatigue was experienced by more women in the sublingual group than in the vaginal group (65 versus 40%: P = 0.043). The overall acceptability of medical management was good. Most women would choose the medical method if they were allowed to choose again and would recommend the method to others. The current regimen of misoprostol is useful for the management of silent miscarriage in terms of complete miscarriage rate and patient acceptability. Sublingual misoprostol may offer an alternative for women who do not like repeated vaginal administration of the drug.
    Human Reproduction 01/2003; 18(1):176-81. · 4.67 Impact Factor
  • W W To, W N Lau
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    ABSTRACT: The aim of the study was to identify risk factors associated with increased risks of post Caesarean febrile morbidity from a retrospective epidemiological analysis, and to prospectively evaluate a protocol of selective antibiotic prophylaxis based on these risk factors. Caesarean section births over a three-year period--during which no antibiotic prophylaxis protocol was practised--were reviewed. Risk factors for febrile morbidity were identified using both univariate and multivariate analysis. A protocol of selective antibiotic prophylaxis, incorporating the significant risk factors identified, was then evaluated prospectively over a nine-month period. The incidence of febrile morbidity from the retrospective study was 16.9%. A logistic regression model, with febrile morbidity as the dependent variable, identified only the duration of labour over 10 hours as a significant factor. A protocol of antibiotic prophylaxis using intravenous ampicillin was then practised in the presence of these two factors. Evaluation of this protocol after nine months showed that the incidence of febrile morbidity was reduced significantly from 20% in those not given antibiotics to around 9.6% in those eligible for and given antibiotics. However, the overall incidence of febrile morbidity remained at around 16-18%.
    Australian and New Zealand Journal of Obstetrics and Gynaecology 12/2001; 41(4):402-6. · 1.30 Impact Factor
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    W N Lau, W W So, W S Yeung, P C Ho
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    ABSTRACT: To analyse the effect of ageing on female fertility in an in vitro fertilisation programme in Hong Kong. Retrospective study. University teaching hospital, Hong Kong. Seven hundred and seventy-one women in whom 1336 cycles of in vitro fertilisation were initiated between 1 January 1986 and 31 December 1995. Patient age and indications for treatment; hormonal response; and the number of cancelled cycles, oocytes retrieved, oocytes fertilised, cleaving embryos, embryos transferred, and clinical pregnancies. Compared with women aged <or =30 years (n=193), women aged > or =36 years (n=398) had a significantly higher cycle cancellation rate (19.3% versus 10.4%), fewer oocytes retrieved per retrieval cycle (6.6 versus 9.0), fewer oocytes fertilised per retrieval cycle (5.0 versus 7.0), fewer cleaving embryos per retrieval cycle (4.8 versus 6.8), and lower serum oestradiol level (9735 [standard deviation, 5681] pmol/L versus 10 708 [5916] pmol/L) despite a larger amount of human menopausal gonadotrophin having been used (all variables, P<0.01; Chi squared test). The clinical pregnancy rate per initiated cycle (range, 7.5%-13.0%) decreased with advancing age (P<0.01; Chi squared test). Ageing has a significant deleterious effect on women's reproductive capability. Women should be encouraged to seek early medical advice and treatment for subfertility.
    Hong Kong medical journal = Xianggang yi xue za zhi / Hong Kong Academy of Medicine 06/2000; 6(2):147-52.
  • W W To, W N Lau
    Australian and New Zealand Journal of Obstetrics and Gynaecology 12/1995; 35(4):363-5. · 1.30 Impact Factor