Benign Prostatic Hyperplasia (BPH) Definition and Anatomy
📌 BPH is the non-cancerous growth of the prostate gland, common in men over 50, often considered a normal part of aging.
💧 The prostate gland, located under the bladder, surrounds the prostatic urethra (the tube urine passes through to the penis).
🔬 The prostate has distinct zones: the peripheral zone (70% glandular tissue), the central zone (25% tissue and ejaculatory ducts), and the transitional zone (5% tissue surrounding the prostatic urethra).

Pathophysiology of BPH
⬆️ BPH is caused by an increase in the enzyme 5$\alpha$-reductase activity with age, which converts testosterone into the more potent androgen, dihydrotestosterone (DHT).
🔗 DHT binds longer to androgen receptors, inhibiting apoptosis (cell death) and causing luminal and basal cells in the prostate to grow and multiply.
👴 This condition affects approximately 50% of men by age 60 and over 90% by age 85.

Clinical Presentation and Diagnosis
🚫 Enlarged prostatic nodules typically form in the periurethral zone, compressing the prostatic urethra and leading to urine outflow obstruction.
🚽 Common symptoms include dribbling, straining during urination, dysuria (painful urination), hesitancy, and nocturia (frequent nighttime urination) due to bladder dilation and irritation.
🖐️ Diagnosis involves a Digital Rectal Examination (DRE) to feel for enlargement and elevated levels of Prostate Specific Antigen (PSA), which increases due to a greater volume of prostate cells producing it.

Treatment Modalities for BPH
💊 Finasteride, a 5$\alpha$-reductase inhibitor, shrinks the prostate by blocking the conversion of testosterone to DHT.
😌 $\alpha$1-antagonists (like phenoxybenzamine) relax the smooth muscles in the bladder neck, prostate, and urethra to improve flow.
🔪 In severe cases, surgical intervention like Transurethral Resection of the Prostate (TURP) may be necessary to remove obstructing prostate tissue.

Key Points & Insights
➡️ BPH is an age-related, non-malignant condition driven by increased DHT stimulation of prostate cells, distinct from prostate cancer risk.
➡️ Obstruction of the prostatic urethra by enlarged tissue leads to secondary issues like bladder wall thickening (hypertrophy) and increased risk of UTIs due to urine stagnation.
➡️ Treatment strategies are tiered, moving from pharmacological inhibition (finasteride) or muscle relaxation ($\alpha$1-antagonists) to physical removal (TURP).

📸 Video summarized with SummaryTube.com on Nov 28, 2025, 02:35 UTC