Biomedical subjects
Publications and source records attributed to A M Prebil.
Fifty consecutive clients achieved pregnancy using a standardization modification of the Billings ovulation method (the Creighton Model Natural Family Planning System). Of 50 clients followed, 38 (76%) achieved pregnancy in the first cycle of fertility-focused intercourse, 45 of 50 (90%) achieved pregnancy by the third cycle and 49 of 50 achieved pregnancy by the sixth cycle (98%).
Several periovulatory symptoms sometimes used in natural family planning are correlated with the estimated time of ovulation in 23 subjects and 64 hormonally normal menstrual cycles. The data suggest that intermenstrual pain may not be due to 1 specific cause but rather to several related factors. As a symptom of ovulation, intermenstrual pain was more specific than lower backache, abdominal bloating, and intermenstrual bleeding nonetheless, intermenstrual pain has a broad periovulatory association. The most reproducible and predictable sign of this series appeared to be the postovulatory occurrence of breast tenderness.
The estimated time of ovulation (ETO) was correlated with the day of defined postovulatory infertility in 66 hormonally normal menstrual cycles from 24 subjects for each of 15 different natural family planning methodologies. Inherent weaknesses were identified in methods based upon calendar calculations or basal body temperature only. These weaknesses could be removed for the basal body temperature-only methods if symptoms, especially the peak mucus symptom, were added to the temperature records. However, the peak mucus symptom alone had the greatest precision of all methods studied. No advantage could be identified in combining the basal body temperature with the peak symptom.
Now that principles of NFP have been established specific programs are necessary to disperse information and to teach techniques. The hospital-based NFP program offers the community a needed service and benefits the hospital.
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