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Introduction: Although the phosphodiesterase 5 inhibitors (PDE5i) are the first-line oral agents for erectile dysfunction (ED) treatment, there is growing number of PDE5i- non responder patients. Management of those patients is challenging and one of the new suggested regenerative therapies is the hyperbaric oxygen therapy (HBOT). HBOT is the application of oxygen under pressure to increase tissue oxygen levels. Few clinical reports were published about HBOT and ED. Objective: To evaluate the efficacy and safety of HBOT in sildenafil citrate non- responder organic ED patients. Methods: The current study included 30 sildenafil citrate non-responder ED patients. Patients were divided into two groups (randomly assigned and comparably cross-matched for age). Both patients and the investigators were blinded as regards the treatment until the end of the study. Group 1: Patients assigned to the HBOT group (20 patients) were treated with (30) sessions in 5 days/week (90 minutes of 100% oxygen at 2.2 ATA); Group 2: Patients assigned to the control group (10 patients) were exposed to (30) sessions of air oxygen tension at 1 ATA with room oxygen. Baseline laboratory investigations were done (random blood sugar, lipid profile, total & free testosterone). All patients were evaluated with the sexual health inventory for men (SHIM), erection hardness score (EHS), the sexual health encounter profile (SEP), and penile color Doppler initially, at 1 & 3 months after the end of treatment. Results: The age mean ± SD in the HBOT group was 56.35±7.43 years and in the control group was 61.7±7.14 years. The current study showed that sildenafil citrate non-responders ED patients with 30 sessions of HBOT in 5 days/week, demonstrated a significant improvement of the total SHIM score, EHS, and SEP after 1 month of stoppage of treatment as compared to the control group. Also, penile color Doppler evaluation showed a significant improvement of 10 &20 minutes peak systolic velocity (PSV) between patients receiving HBOT compared to the control after 1 month of stoppage of treatment. More interestingly, the improvement of the total SHIM score, EHS, and SEP continued after 3 months of stoppage of the HBOT treatment as compared to the baseline evaluation. In addition, 10 &20 minutes PSV with penile color Doppler evaluation demonstrated maintained improvement after 3 months of stoppage of the HBOT treatment as compared to the baseline evaluation. In addition, the linear regression analysis was done for factors affecting SHIM score improvement (1 month/baseline) in the HBOT treatment group, revealing that hypertension was an independent predictor for SHIM score improvement. Hypertensive patients showed 4.6 times more SHIM score improvement as compared to non-hypertensive patients. As regards HBOT safety, there was no significant difference in adverse effects between the HBOT treatment group and the control group. Conclusions: HBOT might be a potential therapeutic modality for sildenafil citrate non-responder ED patients especially in hypertensive patients with good safety profile. Further a multi-centric trial with a larger sample size and a longer follow-up period is recommended. Disclosure: No. [ABSTRACT FROM AUTHOR]

Isotretinoin (13-cis-retinoic acid), a derivative of vitamin A, is used in the treatment of severe acne resulting in sebum suppression induced by sebocyte apoptosis. Isotretinoin treatment is associated with several adverse effects including teratogenicity, hepatotoxicity, and dyslipidemia. Isotretinoin's effects on endocrine systems and its potential role as an endocrine disruptor are not yet adequately investigated. This review presents clinical, endocrine, and molecular evidence showing that isotretinoin treatment adversely affects the pituitary-ovarian axis and enhances the risk of granulosa cell apoptosis reducing follicular reserve. Isotretinoin is associated with pro-apoptotic signaling in sebaceous glands through upregulated expression of p53, forkhead box O transcription factors (FOXO1, FOXO3), and tumor necrosis factor-related apoptosis inducing ligand (TRAIL). Two literature searches including clinical and experimental studies respectively support the hypothesis that isotretinoin's toxicological mode of action on the pituitary-ovarian axis might be caused by over-expressed p53/FOXO1 signaling resulting in gonadotropin suppression and granulosa cell apoptosis. The reduction of follicular reserve by isotretinoin treatment should be especially considered when this drug will be administered for the treatment of acne in post-adolescent women, in whom fertility may be adversely affected. In contrast, isotretinoin treatment may exert beneficial effects in states of hyperandrogenism, especially in patients with polycystic ovary syndrome., (Copyright © 2021. Published by Elsevier Inc.)