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W W Beck

Publications and source records attributed to W W Beck.

12 recordsLinked to original sources
PubMed1989

Contraception.

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Age Factors↗
PubMed1980

Artificial insemination with husband's semen: prognostic factors.

This retrospective review of 38 couples has considered 148 cycles of artificial insemination with husband's semen (AIH) and 178 cycles of natural insemination with husband's semen (NIH). The indication for AIH in every case was that postcoital testing had revealed less than 15 motile sperm/high-power field of endocervical mucus. Conception through AIH occurred in 12 cases; 1 couple conceived by NIH. The rate of conception per cycle was significantly higher in the AIH cycles than in the NIH cycles (P < 0.005). No man with both low density (less than 25 million spermatozoa/ml) and low motility (less than 50%) on semen analysis produced a pregnancy through AIH. Couples demonstrating more than 15 motile sperm/high-power field (on examination of cervical mucus 2 hours after AIH) were more likely to conceive through AIH than couples demonstrating less than 15 motile sperm. The role of AIH is discussed.

Coitus↗
PubMed1975

Variable motility recovery of spermatozoa following freeze preservation.

Semen from a random group of potentially fertile men and a small number of donors who had established an artificial insemination pregnancy was mixed with a cryoprotective agent and frozen by two different methods. After 1 week under liquid nitrogen (-196 degrees C), all samples were thawed and their motilities determined. The post-thaw motilities were compared with the prefreeze motilities. The mean motility recovery rate in the group of semen samples with high counts was better than that in the group with counts in the low-normal range. The recovery rate with the slow-freeze method was slightly higher than that with the quick-freeze technique. However, the wide range of post-thaw motility among the random donors (0 to 60%) and the donors of proven fertility (15 to 45%) demonstrated that prefreeze motility and/or paternity history was no guarantee of good motility recovery following freezing. At a time when semen banking is being contemplated for "fertility insurance" prior to vasectomy, it is apparent that a trial freeze is necessary before recommending freeze-preservation of his semen to the man contemplating permanent surgical sterilization.

Female↗