自發性排卵反應隔一天即應施行人工受孕

自發性排卵反應隔一天即應施行人工受孕

隔2天施行人工受孕懷孕率會下降

Hum Reprod. 2014 Apr;29(4):697-703. doi: 10.1093/humrep/deu022. Epub 2014 Feb 18.

Should an intrauterine insemination with donor semen be performed 1 or 2 days after the spontaneous LH rise? A prospective RCT.

Blockeel C1, Knez J, Polyzos NP, De Vos M, Camus M, Tournaye H.

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Abstract

STUDY QUESTION:

What is the impact on pregnancy rates when intrauterine insemination (IUI) is performed 1 or 2 days after the spontaneous LH rise?

SUMMARY ANSWER:

IUI 1 day after the spontaneous LH rise results in significantly higher clinical pregnancy rates compared with IUI performed 2 days after the LH rise.

WHAT IS KNOWN ALREADY:

IUI is scheduled within a limited time interval during which successful conception can be expected. Data about the optimal timing of IUI are based on inseminations following ovarian stimulation. There is no available evidence regarding the correct timing of IUI in a natural menstrual cycle following the occurrence of a spontaneous LH rise.

STUDY DESIGN, SIZE, DURATION:

A prospective RCT, including patients undergoing IUI with donor sperm in a natural menstrual cycle. IUI cycles (n = 435) were randomized between October 2010 and April 2013, of which 23 were excluded owing to protocol deviation and 412 received the allocated intervention.

PARTICIPANTS/MATERIALS, SETTING, METHODS:

Serial serum LH concentrations were analysed in samples taken between 07:00 and 09:00 h to detect an LH rise from Day 11 of the cycle onwards. The subjects were randomized to receive insemination either 1 or 2 days after the observed LH rise. In the final analysis, there were 213 cycles in the group receiving IUI 1 day after the LH rise and 199 cycles in the group receiving IUI 2 days after the LH rise.

MAIN RESULTS AND THE ROLE OF CHANCE:

Significantly higher clinical pregnancy rates per IUI cycle were observed in patients undergoing IUI 1 day after the LH rise when compared with patients undergoing IUI 2 days after the LH rise [19.7 (42/213) versus 11.1% (22/199), P = 0.02]. In view of the timing of sampling for LH, the inseminations were performed at 27 h (±2 h) and 51 h (±2 h) after detection of the LH rise. The risk ratio of achieving a clinical pregnancy if IUI was scheduled 1 day after the LH rise compared with 2 days was 1.78 [95% confidence interval (CI), 1.11-2.88]. This points towards a gain of one additional clinical pregnancy for every 12 cycles performed 1 day instead of 2 days after the LH rise. When analysing the results per patient, including only women who underwent their first treatment cycle of insemination, the outcome was in line with the per cycle analysis, demonstrating an 8% difference in pregnancy rate in favour of the early group (20.5 versus 12.2%), however, this difference was not significant.