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Hum. Reprod. Advance Access originally published online on July 8, 2005
Human Reproduction 2005 20(11):3167-3172; doi:10.1093/humrep/dei180
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© The Author 2005. Published by Oxford University Press on behalf of the European Society of Human Reproduction and Embryology. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org

Criteria of a successful coasting protocol for the prevention of severe ovarian hyperstimulation syndrome

Ragaa Mansour1, Mohamed Aboulghar, Gamal Serour, Yehia Amin and Ahmed M. Abou-Setta

The Egyptian IVF–ET Center, 3, Road 161 Hadayek El-Maadi, Cairo 11431, Egypt

1 To whom correspondence should be addressed. E-mail: ivf{at}link.net

BACKGROUND: The aim of this study is to report a large series of patients (n = 1223) at risk of developing ovarian hyperstimulation syndrome (OHSS) who underwent coasting. METHODS: Coasting started when the leading follicle reached 16 mm and continued until the estradiol (E2) level fell to 3000 pg/ml. RESULTS: The E2 level at the start of coasting was (mean ± SD) 6408 ± 446 and it fell to 2755 ± 650 on the day of HCG injection, after (mean ± SD) 2.89 ± 0.94 days. The results were analysed according to the duration of coasting (#3 days, group I: n = 983; >3 days, group II: n = 240). The number of oocytes retrieved was (mean SD) 16.45 ± 6.25 and 14.93 ± 6.01 in groups I and II respectively (P < 0.05). The fertilization rates were 63 and 65% in groups I and II respectively (P > 0.05). The implantation and clinical pregnancy rates were 26 and 52% in group I compared to 18 and 36% in group II respectively (P < 0.05). Severe OHSS occurred in 16 cases, which represented 0.13% of all stimulated cycles, and 1.3% of patients who were at risk of developing OHSS. CONCLUSIONS: Our protocol of coasting was an effective measure in the prevention of OHSS, without jeopardizing the ICSI outcome. Coasting for >3 days is associated with a moderate decrease in the pregnancy rate.

Key words: assisted reproductive technology/coasting ovarian hyperstimulation syndrome/ovulation induction/prevention


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