Abstract:

Objective

To study the changes of the images of electrical impedance scanning of the breast (EIS) before and after menstrual period in premenopausal women.

Methods

Sixty healthy, non-pregnancy, non-lactation, and premenopausal volunteers,aged 25 to 45 years,received EIS examinations once a week and within a few days before and after menstruation for 14 months.The EIS images before and after menstruation of the subjects were observed, and whether the abnormal EIS images were related with the age of the subjects was analyzed.Paired chi-square test and chi-square test were used for statistical analysis.

Results

The observation found that abnormal EIS spots (false-positive spots )appeared on the images before menstruation(3-5 days before menstruation).Usually the false-positive spots lasted only one week and disappeared after menstruation (3-7days after menstruation), and the abnormal EIS images became normal, showing an evenly gray pictures.In this group the results of the breast EIS images were influenced in 81.7%(49/60)subjects before and after menstruation, but 18.3% (11/60) subjects were not influenced before and after menstruation.There was a significant difference in the EIS images between before(3-5 days) and after(4-7 days)menstruation in the 60 subjects (P=0.000).The changes of the EIS images before and after menstruation were not correlated with the age (P＞0.050).

Conclusion

False-positive EIS images of the breast can occur before menstruation in women.In order to get accucate EIS results and avoid false positive results.it is suggested that EIS examination of the breast should keep away from the time of 3-5 days before menstruation for women.

Key words: electrical impedance scanning, breast, pre-and post-menstruation