Intra-Uterine Pressure in Dysmenorrhea

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Abstract
Intrauterine pressure recordings in normal and dysmenorrheic women during the menstrual period were analyzed regarding amplitude, duration, frequency and peak area of contractions and resting pressure. The activity of the myometrium showed large between subject variability and no significant difference was found between the 2 groups in amplitude and duration of contractions or their frequency. However, there was a consistent difference in peak area at the onset of the menses (P < 0.01); there was also a significant decrease in peak area during the menses in the group with dysmenorrhea, with maximum uterine work being performed on the day when the pain was as its worst. The contribution of the pattern of contractility to the etiology of dysmenorrhoea is discussed. Abnormal uterine activity as a cause of primary dysmenorrhea was suggested in the 1930s and 1940s on the basis of intrauterine pressure recordings. Since then, intrauterine pressure was measured in a number of studies using a micro-balloon. With the introduction of the highly sensitive micro-transducer catheter it was possible to make accurate quantitative estimations but no detailed analysis and quantification of intrauterine pressure recordings in primary dysmenorrhea has been reported. This study reports daily recordings obtained from women suffering from primary dysmenorrhea compared with those from a group of women with very similar menstrual patterns but with minimal or no symptoms.

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