Intracavernosal Injection of Botulinum Toxin Type A in the Treatment of Vascular Erectile Dysfunction

Cairo University (CU)

Status and phase: Completed; Phase 1

Conditions: Vasculogenic Erectile Dysfunction

Treatments: Drug: Normal Saline; Drug: Botulinum Toxin Type A

Study type: Interventional

Funder types: Other

Identifiers

NCT02584686

1121015

Details and patient eligibility

About

Evidence has been arising that Botulinum toxin injections can relax smooth muscles fibers in the treatment of obesity and hyperactive bladder. Would a similar effect on cavernosal smooth muscles help in the treatment of resistant erectile dysfunction not responding to medical and injection therapy, thus avoiding surgical treatment options.

The treatment group will be injected intracavernously with 50 units of BTX-A. The control group, 12 patients, will be injected with a normal saline injection.

Full description

24 males with will be included in the study. All will be subjected for full history taking, general and genital examination. Penile duplex will be performed to assess a vascular etiology before the treatment and 2 weeks later. The patients will be randomized into a treatment group (12 patients) and a control group (12 patients).

All patients will sign an informed consent. The treatment group will be injected IC with a trimix solution (20 ug alprostadil + 1 mg phentolamine + 30 mg papaverine) for color Doppler assessment, followed, next day by 50 units of BTX-A. The control group, 12 patients, will be injected with the trimix solution during penile color Doppler assessment followed next day with a normal saline injection. The erection hardness score (EHS) will be assessed during the Doppler exam.

Procedure: At least 1 day after the penile color Doppler test, the patient is placed in the supine position flaccid and stretched penile length and girth would be measured from tip of the penis to the pubic bone will be done. A rubber band will be applied to the base of the penis. The skin will be prepped with alcohol swabs followed by the IC injection of 50 units of BTX-A. Direct pressure will be applied for 2 minutes. The rubber band will be removed after 15 minutes.

Patients and controls will fill the Sexual Health Inventory for men (SHIM) questionnaire and answer the the Sexual Encounter Profile questions 1 and 2 (SEP 2 & SEP 3), and the global assessment question (GAQ) before and 4 weeks after treatment.

The rational for selecting the minimum 2-weeks waiting period is to give a chance for the BTX-A to reach its maximum effect. Possible Risks include pain and prolonged erections.

Enrollment: 24 patients

Sex: Male

Ages: 40 to 70 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• 24 males will be included in the study recruited from Andrology, Sexology & STD's outpatient clinic, Kasr El Aini Hospitals, Cairo University, complaining of Vascular ED proved by penile duplex.
• Unable to develop erections sufficient for intercourse.
• Failing to respond to first line and second line treatments for Erectile Dysfunction with surgery as the only remaining treatment option.
• Age between 40 to 70 years.

Exclusion criteria

• Significant cardiovascular disease interfering with sexual activity

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Double Blind

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24 participants in 2 patient groups, including a placebo group

(BTX) A Group

Experimental group

Description:

The treatment group will be injected intracavernously with a trimix solution for colour Doppler assessment, followed, on a separate day by 50 units of Botulinum toxin (BTX) A.

Treatment:

Drug: Botulinum Toxin Type A

Saline Group

Placebo Comparator group

Description:

The control group, 12 patients, will be injected with a trimix solution (20 ug alprostadil + 1 mg phentolamine + 30 mg papaverine) during penile colour Doppler assessment followed on a separate day with a normal saline injection.

Treatment:

Drug: Normal Saline