Recent clinical data reveals that modified water vapor therapy provides a safe and effective option for men with large-volume benign prostatic hyperplasia (BPH). Traditionally, minimally invasive options remained limited for patients with prostate volumes exceeding 80 mL. However, this prospective study demonstrates that modified techniques using the Rezum system can significantly alleviate symptoms and reduce gland size even in larger prostates.

Clinicians enrolled 196 consecutive patients with a median prostate volume of 96 mL. All participants underwent the modified thermal therapy with successful outcomes. Consequently, researchers observed a dramatic decrease in the International Prostate Symptom Score (IPSS) from 21.2 at baseline to 10.8 at one year. Additionally, the median prostate volume shrank from 96 mL to 60 mL, representing a 37.5% reduction. These findings highlight the procedure's ability to handle substantial enlargement without compromising patient safety.

Efficacy of modified water vapor therapy in Large Prostates

Furthermore, the maximum urinary flow rate (Qmax) improved significantly from 8.3 mL/s to 15.7 mL/s. Importantly, quality of life (QoL) scores also mirrored this positive trend, improving from 4.3 to 1.7. Because these results remained stable for twelve months, the study suggests that modified protocols can effectively bridge the gap between medication and more invasive surgeries. Specifically, this approach offers a faster recovery while preserving sexual function, which remains a primary concern for many patients. Therefore, urologists may find this technique particularly useful for aging populations seeking less invasive interventions for significant glandular enlargement.

Frequently Asked Questions

Is water vapor therapy safe for prostates larger than 80 mL?

Yes, recent studies show that modified water vapor therapy is safe and effective for prostates over 80 mL, with significant reductions in volume and no major complications reported in large cohorts.

What symptom improvements can patients expect after one year?

Patients typically experience a significant drop in IPSS scores. In this study, scores improved from 21.2 to 10.8, along with a nearly 100% increase in the maximum urinary flow rate (Qmax).

Disclaimer: This content is for informational and educational purposes only. It is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Refer to the latest local and national guidelines for clinical practice.

References

Lu Q et al. Modified water vapor thermal therapy for large-volume benign prostatic hyperplasia. BMC Urol. 2026 Feb 07. doi: 10.1186/s12894-026-02050-3. PMID: 41652420.

Siqueira MHB et al. Rezūm water vapor thermal therapy for large-volume (≥80 mL), symptomatic, benign prostatic enlargement: Large, multicenter, real-world cohort with two-year followup. Can Urol Assoc J. 2025. doi: 10.5489/cuaj.9336.

Bole R et al. Rezūm therapy for ≥80-mL benign prostatic enlargement: a large, multicentre cohort study. BJU Int. 2022. doi: 10.1111/bju.15753.