Programa del congreso

Uterine peristalsis in non-pregnant women is a pivotal factor in reproduction. However, its inherent short-term physiological variability could lead to inaccurate characterization depending on the duration of the recording. A total of 98 intracavitary electrohysterographic (IC-EHG) recordings of 30 minutes in different menstrual phases were analysed. The variability between single peristaltic cycles of three key parameters (frequency, amplitude, percentage of time in contraction) and the error caused by this variability for recording lengths of 3, 5, and 10 minutes were studied. The Mean Absolute Percentage Error (MAPE) with respect to the median value of the full recording was utilised for this assessment. The contraction frequency and amplitude exhibited the largest physiological variability yielding mean MAPEs of 15.34% and 17.03% for 3-minute windows, which were significantly reduced to 6.68% and 8.66% for 10-minute windows, reflecting the greater robustness of longer recordings against short-term physiologically driven fluctuations. The contraction time percentage exhibited lowest variability, possibly due to the intrinsic refractory properties of myocytes. Notably, the highest variability was observed during the late luteal phase, particularly in amplitude and contraction time percentage. The present findings underscore the significance of extended recording periods in comparison to those presently utilised by imaging techniques, such as transvaginal ultrasound and cine magnetic resonance imaging. This is critical for the reliable and accurate characterisation of uterine peristalsis throughout the menstrual cycle.