257 Identifying surgical factors predicting postoperative potency in robot-assisted radical prostatectomy Method Subject selection and Matching Patients who underwent a RARP in the Antoni van Leeuwenhoek Hospital in Amsterdam, the Netherlands, between June 2009 and February 2017 were eligible for this study. All of the selected patients were operated on by the same expert robotic surgeon (HvdP), who had performed over 200 RARPs using the daVinci Si surgical robot by Intuitive in June 2009 and over 1400 RARPs in February 2017. The groups were selected based on the patient’s preoperative and postoperative potency as measured using the Potency area of the International Index of Potency Questionnaire (IIEF-EF- score). The IIEF-EF is a patient-reported outcome measure (PROM) questionnaire that registers the patient’s erectile function over the last 4 weeks by asking six questions: (i) How often were you able to get an erection during sexual activity? (0–5 points) (ii) When you had erections with sexual stimulation, how often were your erections hard enough for penetration? (0–5 points) (iii) When you attempted intercourse, how often were you able to penetrate (enter) your partner? (0–5 points) (iv) During sexual intercourse, how often were you able to maintain your erection after you had penetrated (entered) your partner? (0–5 points) (v) During sexual intercourse, how difficult was it to maintain your erection to completion of intercourse? (0–5 points) (vi) How do you rate your confidence that you could get and keep an erection? (0–5 points) The cumulative score of the six questions (0–30 points) represents the patient’s experience of potency. In this study, an IIEF-EF score < 19 at 6 and 12 months after surgery was defined as impotent, whilst an IIEF-EF score of > 20 at 6 and 12 months after surgery was defined as potent. Exclusion criteria were suffering from potency complaints prior to surgery (IIEF-EF score > 20), and surgical procedures where no or incomplete video material was available. In 227 patients, a surgical video and complete PROM data were available at 6 or 12 months after surgery. Two groups (potent and impotent) were selected and matched (Fig. 1). The patients in the potent group were matched according to preoperative factors, which in the literature have been shown to influence the chances of the patient’s
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