Perceived versus measured functional vaginal capacity in cancer patients with sexual function concerns.
170 Background: Actual and perceived loss of vaginal capacity can be a source of distress among female cancer survivors. The objective of this study was to assess perceived (PC) versus measured (MC) functional vaginal capacity in patients presenting with sexual function concerns. Methods: This was a cross-sectional registry-based study of women seen at the Program in Integrative Sexual Medicine for Women and Girls with Cancer (PRISM) Clinic. During the visit, patients were presented with graduated vaginal dilators and asked to select the largest dilator they perceived could be inserted without pain (PC) and the dilator representing their desired functional capacity (DC) (for patients with a male partner, this was the size closest to the partner’s erect penis). Two models of dilators were offered. Dilators were numbered 1-24 in order of increasing volume. If the patient could accommodate the dilator chosen as PC without pain, she was examined with dilators of gradually increasing size until the patient reported discomfort. The largest dilator tolerated without pain was MC. Differences between PC and MC, and between DC and MC were calculated. The association between penetrative sexual activity in the prior 4 weeks and accuracy of PC was assessed using the Mann-Whitney U test. Results: Mean patient age was 46 years (range 21-80, N=69). Most patients had breast (43%) or a gynecologic cancer (16%); 29% had benign disease. Nearly half reported two or more sexual concerns; painful intercourse (81%), vaginal complaints (21%), and loss of libido (19%) were most common. Median PC was 50cm3 (IQR 35-65cm3), median MC was 81cm3 (IQR 60-90cm3), and median DC was 90cm3 (IQR 81-132cm3). PC equaled MC in 22%. PC was less than MC in 75% and less than DC in 81% of patients. Of patients with PC less than DC, 41% had MC equal to or larger than DC. PC was closer to MC in patients reporting penetrative sexual activity in the prior 4 weeks (p=0.02). Conclusions: In this single-site study, many cancer survivors seeking care for sexual concerns underestimate their functional vaginal capacity. Further study is needed to determine whether correcting patient perception of capacity lessens distress and improves function.