Role of Endometrial Scratch in UnExplained infertility (RESCUE); A Randomized Clinical Trial
Abstract Background Endometrial natural killer (NK) is thought to play a role in implantation and maintenance of a healthy pregnancy. However, their immunological role in unexplained infertility is yet unknown. The aim of the current study was to investigate the role of endometrial injury in treatment of unexplained infertility and to have more insight on the potential underlying mechanisms of its action methodology randomized controlled trial (RCT) done at Minia university hospital, diagnostic laparoscopy was done for both study and control group, study group had gentle scratch and specimens were sent for histopathological examination while control group had Laparoscopy only .Patients in both groups were followed up at the outpatient clinic for 3 months to assess if pregnancy achieved or not. Patients in the study group who had not achieved pregnancy had a repeated scratch using a pipelle sampler which was also sent for histopathology. Patients were counselled for intrauterine insemination (IUI) with ovulation induction while patient in control group had been counselled for IUI and ovulation induction only. Patients in both groups were followed up for further 3 months to assess patients who achieved pregnancy either naturally or after IUI . Results Baseline characteristics were comparable in both groups. Clinical pregnancy rate (CPR) was significantly higher in scratch group compared with the control group (22%; vs. 7.4%, P = 0.001) in the first three months of follow up. After second scratch and IUI cycles cumulative pregnancy rate was significantly higher in the scratch group compared with the control group (36.7% , vs. 16.2%,, P = 0.001). The mean time achieve pregnancy was found to be significantly shorter in the scratch group as compared to the control group (102 days vs.49.5 days, P = 0.01). Conclusion: Endometrial natural killer cells might play a crucial role in endometrial receptivity and therefore embryo implantation. Endometrial scratch could promote the recruitment of endometrial NK cells and give a more favourable results as regard clinical pregnancy in patients with unexplained infertility. Registration number PACTR201604001405465