Assessment and intervention
The participants underwent a comprehensive assessment during the second phase of the menstrual cycle (day 15 to day 25). This involved collecting their medical history and performing transvaginal color Doppler ultrasound to evaluate the pulsatility and resistance indexes of the uterine artery, as well as the endometrial thickness. The first group received Nifedipine (10 mg) by oral route twice daily, and the second group received Sildenafil citrate (20 mg) orally every 8 hours from day 5 of the menstrual cycle until day 25. Reassessment of pulsatility and resistance indexes of uterine artery and endometrial thickness was done at the second phase of the next menstrual cycle (day 15 to day 25) using transvaginal color Doppler ultrasound to observe the effect of these pharmacological agents.