A cohort study on safety for oocyte retrieval in IVF using the same 20G needle for local analgesia and retrieval. Vaginal cleaning did not add to the safety of the procedure

Aim of study: What is the effectiveness and safety of using a 20G single lumen needle (SLN) for both applying local analgesia (LA) in the vaginal vault and ovarian capsule and oocyte retrieval (OR) using a simple syringe? And will thoroughly cleaning (TC) of the vagina before reducing the risk of the puncture procedure? Using a thin SLN has been postulated to jeopardize cumulus oocyte complexes (COC). Further applying LA in the same needle without retracting the needle before OR has been claimed to harm oocyte development. Also, many clinics extensively clean the vagina before OR. Methods: We performed a retrospective cohort study including 4983 women. 877 underwent no cleaning (nonTC) of the vagina and 4106 underwent TC using NaCl. All had OR with a 20G SLN attached to a syringe for local anaesthesia and egg collection. The treatments were done in one centre during the period from January 2016 to June 2019. We studied women undergoing IVF treatment aged 18–45 years. Women had either thoroughly vaginal cleaning before OR or no cleaning depending on the physicians preferences. All women had LA using Citanest Dental Octapressin 2ml. placed in the vaginal vault in the direction of the intended puncture including in the ovarian capsule. Therefore, only one puncture was needed in both sides, left and right. All punctures were hereafter followed by OR using the same 20G SLN. Aspiration was done by a 20ml syringe handled manually by the physician. All women underwent a conventional antagonist protocol with FSH stimulation and Ovitrelle 250IU for induction or Mild Stimulation using Tamoxifen, FSH and Ovitrelle. Outcome measurement were bleeding measured by the necessity of applying compression after the puncture or infection observed up to 1 month. Results: Baseline characteristics including age, BMI and type of stimulation were comparable between the groups. In the nonTC group no infections, bleedings or abscesses were found. In the TC group there were 1 abscess observed. Intact COC was similar in the two groups as well as pregnancy rates. Conclusion: During OR in ART the use of a 20G SLN using the same needle for LA and hereafter, without changing needle in the puncture channel, continue with the egg collection (EC) is simple and safe. In this situation TC is not necessary before puncture, making the procedure more patients friendly. In women undergoing oocyte retrieval for IVF, we found the use of a 20G SLN for both applying LA and retrieving COC safe, effective and simple. Additional TC of the vagina before puncture did not add more to the safety of the procedure.