The Effect of the Levonorgestrel-Releasing Intrauterine System on Myometrial Blood Flow in Patients With Heavy Menstrual Bleeding

Background Abnormal uterine bleeding constitutes a vexing issue among female patients, substantially impacting their quality of life. Surgical interventions, particularly hysterectomy, contribute to the psychological, physical, and financial burden on families and, by extension, the healthcare system. Levonorgestrel-releasing intrauterine system (LNG-IUS) represents a conservative management approach and emerges as a beneficial option for affected patients. The present study aims to elucidate color Doppler changes in the uterine artery pre- and post-LNG-IUS insertion. Objective The primary objectives encompass an investigation into the variations in Doppler indices (resistance index (RI) and pulsatility index (PI)) within the arcuate and radial branches of the uterine artery, as well as the assessment of endometrial thickness before LNG-IUD insertion, at three months, and six months post- insertion. Secondary outcomes include evaluating changes in pictorial blood assessment chart (PBAC) scores before insertion, at three months, and at six months after LNG-IUS insertion. Methods A cross-sectional study was conducted at the Department of Obstetrics and Gynecology at All India Institute Of Medical Sciences (AIIMS), Nagpur. A cohort of 25 women underwent LNG-IUS insertion. The endometrial cavity, RI, and PI of both arcuate and radial arteries were assessed before LNG-IUS insertion and at three and six months after insertion. Results The PI of the arcuate artery exhibited minimal alteration over the six-month duration, with a p-value of 0.43. Conversely, the RI demonstrated a statistically significant increase over the same period (p = 0.03). Conversely, the radial artery exhibited no statistically significant changes in either PI or RI (p = 0.39 or 0.13, respectively). Conclusion Following six months of LNG-IUS utilization, a substantial reduction in endometrial thickness and menstrual flow was observed, concomitant with an improvement in hemoglobin levels. Notably, the PI of both the arcuate and radial arteries demonstrated no significant change. Although the RI of the arcuate artery increased, its clinical relevance may be limited. Consequently, the observed reduction in menstrual bleeding cannot conclusively be ascribed to diminished blood flow in uterine arteries.