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Table 3 Ultrasound parameters between two groups. (Subendometrial resistance index, subendometrial pulsatility index, subendometrial / uterine artery resistance index ratio and subendometrial / uterine artery pulsatility index ratio) at baseline, at day 6, 8 and 10 after controlled ovarian stimulation, at trigger day and at embryo transfer day. Mean values with standard deviation (SD). SE/Ut – Subendometrial / Uterine Arteries ratio; rhCG – recombinant Human chorionic gonadotropin

From: Subendometrial resistence and pulsatility index assessment of endometrial receptivity in assisted reproductive technology cycles

  Non Implantation N = 123 (72.8%) Implantation N = 46 (27.2%) t Test p value
Basal
 Subendometrial Resistance Index 0.77 ± 0.17 0.71 ± 0.17 0.82
 Subendometrial Pulsatility Index 1.16 ± 0.25 1.01 ± 0.26 0.1
 SE/Ut RI ratio 0.80 ± 0.09 0.76 ± 0.12 0.6
 SE/Ut PI ratio 0.73 ± 0.12 0.77 ± 0.11 0.117
Day 6 after Controlled Ovarian Stimulation
 Subendometrial Resistance Index 0.84 ± 0.17 0.73 ± 0.14 0.001
 Subendometrial Pulsatility Index 1.14 ± 0.20 0.98 ± 0.22 0.001
 SE/Ut RI ratio 0.82 ± 0.10 0.77 ± 0.09 0.04
 SE/Ut PI ratio 0.72 ± 0.14 0.68 ± 0.12 0.132
Day 8 after Controlled Ovarian Stimulation
 Subendometrial Resistance Index 0.95 ± 0.16 0.79 ± 0.18 0.001
 Subendometrial Pulsatility Index 1.24 ± 0.20 1.03 ± 0.25 0.001
 SE/Ut RI ratio 0.87 ± 0.13 0.81 ± 0.12 0.04
 SE/Ut PI ratio 0.75 ± 0.15 0.73 ± 0.10 0.615
Day 10 after Controlled Ovarian Stimulation
 Subendometrial Resistance Index 1.04 ± 0.718 0.88 ± 0.19 0.001
 Subendometrial Pulsatility Index 1.32 ± 0.23 1.12 ± 0.31 0.001
 SE/Ut RI ratio 0.88 ± 0.11 0.82 ± 0.08 0.04
 SE/Ut PI ratio 0.72 ± 0.10 0.75 ± 0.11 0.251
Trigger Day with rhCG
 Subendometrial Resistance Index 0.78 ± 0.16 0.65 ± 0.12 0.001
 Subendometrial Pulsatility Index 0.95 ± 0.14 0.83 ± 0.14 0.001
 SE/Ut RI ratio 0.84 ± 0.14 0.73 ± 0.09 0.01
 SE/Ut PI ratio 0.72 ± 0.12 0.68 ± 0.11 0.01
Embryo Transfer Day
 Subendometrial Resistance Index 0.99 ± 0.15 0.87 ± 0.12 0.001
 Subendometrial Pulsatility Index 1.19 ± 0.17 1.07 ± 0.20 0.001
 SE/Ut RI ratio 0.84 ± 0.15 0.74 ± 0.10 0.001
 SE/Ut PI ratio 0.66 ± 0.12 0.70 ± 0.08 0.018