尿管結石排石促進治療の成功率は？

最終更新日： 2026年5月18日

• フェイスブック
• インスタグラム
• ワードプレス
• テレグラム
• WhatsApp
• LinkedIn
• メール

It is very common for me to care for ureteric stone pain patients who have frequent questions about medical expulsive therapy (MET) for ureteric stones. Here are the answers in Q&A format.

• 泌尿器センター バンコク病院 タイ オンライン予約 02-310-3009 bhquro@bdms.co.th
• サミティジ・シラチャ病院 チョンブリ 088-022-1445

Q: Is it possible to avoid endoscopic stone surgery?

Yes, it is possible — but only if all of the following emergency conditions are absent:

• Pain is adequately controlled by pain medication
• No sign of kidney failure from stone obstruction
• No signs of life-threatening bloodstream infection (urosepsis)

Q: How likely is a ureteric stone to pass spontaneously without medication?

It depends on the size and location of the obstructing stone:

• By size: 68% for stones <5 mm; 47% for stones 5–10 mm
• By location: 48% for upper ureter; 60% for mid-ureter; 75% for lower ureter

Q: How much does medical expulsive therapy improve the stone passage rate?

According to US and European urological guidelines, medical expulsive therapy (typically alpha blockers such as Tamsulosin) increases the stone passage rate by approximately 29% compared to no medication.

Q: Are there any side effects of medical expulsive therapy?

There is a chance that ureteric pain may temporarily worsen as the medication facilitates stone movement. Approximately 4% of patients experience side effects including dizziness, headache, nausea, and vomiting.

Q: What parameters are used to assess stone passage success?

Several CT-based parameters are assessed: transverse stone diameter, longitudinal stone diameter, ureteral diameter at the stone level, and stone-to-bladder distance. These help the urologist select the right patients for medical expulsive therapy vs. early endoscopic intervention.

During the treatment period, I schedule regular follow-up visits with at least an ultrasound to check whether the stone is moving downward. Important: Do not take MET medications on your own without medical supervision, as serious complications can arise without proper monitoring.

私の公式ホームページにアクセスできます ここ.

Frequently Asked Questions About Ureteric Stone Medical Expulsive Therapy

What is medical expulsive therapy (MET) for ureteric stones?

Medical expulsive therapy (MET) is the use of oral medication — typically alpha blockers such as Tamsulosin — to relax the smooth muscle of the ureter, facilitating spontaneous passage of a ureteric stone without surgery. It is suitable for patients who are clinically stable (no sepsis, no kidney failure, adequate pain control) and who have stones likely to pass based on CT assessment of size and location.

What are the success rates for ureteric stones to pass with MET?

Without medication, the spontaneous passage rate is 68% for stones under 5 mm and 47% for stones 5–10 mm. Lower ureteric stones have a 75% spontaneous passage rate compared to 48% for upper ureteric stones. Adding medical expulsive therapy increases the overall passage rate by approximately 29% based on US and European guidelines, making it a meaningful adjunct to conservative management.

When is medical expulsive therapy not appropriate?

MET should not be used when there are emergency indications for immediate intervention: urosepsis (life-threatening urinary infection), acute kidney failure from bilateral obstruction or single kidney obstruction, or pain that cannot be controlled with medication. In these situations, urgent endoscopic intervention (ureteroscopy or ureteric stenting) takes priority over conservative management.

If you have ureteric stone pain and would like a specialist evaluation, Dr. Soarawee Weerasopone offers specialist consultations at Bangkok Hospital Headquarters. 診療をご予約.

**免責事項:** このコンテンツは、バンコク病院本部の認定泌尿器科医であるSoarawee Weerasopone博士によって作成およびレビューされました。教育目的のみのものであり、医学的アドバイスを構成するものではありません。いかなる医療処置を開始する前にも、必ず資格のある医療専門家にご相談ください。.