Ultrasound: a technique useful in determining the side of ovulation

It is often assumed that ovulation commonly occurs from alternating sides each month, but it is unknown whether it can occur repeatedly from the same side. In an effort to answer this question, we selected 39 women from our infertility clinic who had six consecutive courses of ultrasound (US) to monitor ovulation and in whom the side of ovulation was recorded. Nine patients (23.1%) ovulated from the same side for six consecutive cycles, whereas no patient alternated side of ovulation in the same period of time. Stimulation with clomiphene citrate and/or human menopausal gonadotropin that results in single ovulation did not affect this pattern. The data were analyzed statistically with the use of a Markov Chain Model and the chi-square goodness-of-fit; the occurrence of persistent same-side ovulation was significant to ≤0.001.

人们通常认为排卵通常每月在两侧交替进行，但尚不清楚是否会在同一侧反复排卵。为了回答这个问题，我们从我们的不孕不育诊所选取了39名女性，她们连续进行了6个疗程的超声检查以监测排卵，并记录了排卵的一侧。9名患者（23.1%）连续6个周期从同一侧排卵，而在同一时间段内没有患者出现排卵侧交替的情况。使用克罗米芬柠檬酸盐和/或人绝经促性腺激素刺激导致单次排卵并没有影响这种模式。使用马尔可夫链模型和卡方拟合优度对数据进行了统计分析；持续同一侧排卵的发生具有显著意义（P≤0.001）。