A NOVEL ULTRASOUND TECHNIQUE CAN PREDICT EFFICACY OF BOTOX INJECTION IN PATIENTS WITH ED

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madman

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Objectives

Erectile dysfunction (ED) is the inability to get or keep an erection for sexual activity, affecting 5–20% of men worldwide. Starting from 2016, botulinum neurotoxin was tested for treating ED after a human pilot trial. Shear wave elastosonography (SWE) is one of the ultrasound techniques that can be applied to assess corporal tissue stiffness. We aimed to evaluate the SWE predictability of the outcome of a penile Botox injection.


Methods

Twenty men aged 18–70 with erectile dysfunction and PDE5I non-responders participated in the outpatient clinic of the university hospital. Intracavernosal prostaglandin E1 (PGE1) injection. Three elastography measurements fo reach corpus cavernosum were taken before and after PGE1 injection, and then their average was calculated. 100 IU of OnabotulinumtoxinA diluted in 2 ml of normal saline was injected. The International Index of Erectile Function (IIEF-5), Sexual Encounter Profile questions 2 and 3 (SEP-2 and SEP3), and Erection Hardness Score (EHS) were measured before and 1 month after Botox injection.


Results

There was marked improvement in erectile function measured as the mean IIEF-5 changed from 8.55 to 14.1.61, p < 0.001, with a mean difference of 5.6. SEP-2 changed from 1.75 to 2.56, p= 0.012 with a mean difference of 0.77; SEP-3 changed from 1.60 to 2.39, p= 0.018 with a mean difference of 0.77; and EHS changed from 1.37 to 1.83, p= 0.008 with a mean difference of 0.52. SWE measurements taken after PGE1 injection showed a significant negative association with erectile state outcomes after Botox injection, as measured by IIEF-5 (r= -0.429, p= 0.03). In contrast, pre-injection peak systolic velocity measurements showed no significant correlation to outcomes.


Conclusions

Shear wave elastography may predict improvement after Botox injection.
 

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