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難治性心室頻拍の治療のための定位アブレーション放射線療法 (SABRE-VT)

2026年9月18日 更新者:Barts & The London NHS Trust

Ventricular tachycardia (VT) is an abnormal rhythm arising from the bottom chambers (ventricles) of the heart. The hearts of most patients who develop VT have been previously damaged by a myocardial infarction (heart attack) or other heart muscle diseases (cardiomyopathies). The damage produces scar or fatty deposits that conduct electrical impulses slowly allowing VT to occur. Recurrent episodes of VT can compromise heart function and increase mortality.

VT is prevented by special drugs but these are not always effective and can have many side effects. Most patients with VT will also have a specialised device called an implantable defibrillator (ICD) implanted. The ICD treats VT by either stimulating the heart rapidly or delivering a shock to it. ICDs are very effective but the shocks are painful and have a big impact on quality of life. If VT occurs despite optimal drug treatment, patients undergo an invasive procedure called catheter ablation. Here, wires are passed into the heart from the blood vessels in the leg and the damaged heart muscle causing the VT is identified whilst the heart is in VT. An electrical current is passed down the wire making its tip heat up allowing discrete burns (ablation) to be placed inside the heart. The ablated heart muscle doesn't conduct electricity which stops the VT and prevents it recurring.

Some patients are so frail that ablation cannot be performed safely. A recent clinical trial has shown that VT can be treated in such patients using radiotherapy, which is usually used to treat tumours with high energy radiation. This approach is non-invasive, painless and requires no sedation or anaesthesia.

This study will test whether VT can be successfully treated using stereotactic ablative radiotherapy. This can deliver high dose radiotherapy very precisely, whilst minimising the risk of damage to healthy tissues.

調査の概要

状態

完了

条件

介入・治療

詳細な説明

Principal objectives:

1. To determine the safety and efficacy of stereotactic ablative radiotherapy (SABR) for the treatment of VT refractory to conventional therapies.

Background:

VT is an abnormal heart rhythm arising from either of the bottom chambers of the heart (ventricles). Most patients with VT have scarring or fatty deposits in the heart muscle caused by a previous heart attack or a heart muscle problem called a cardiomyopathy. The abnormal heart muscle conducts electricity slowly allowing VT to occur. Most patients with VT have a device called an implantable defibrillator (ICD) fitted to treat VT. The ICD has wires going into the heart from a small generator that is inserted under the skin below the left collar bone. ICDs stop VT by stimulating the heart rapidly or by shocking the heart which is very painful and can stun the heart temporarily, weakening its pumping function. Patients who experience a lot of VT can have more admissions to hospital, worsening heart failure and a poorer quality of life, as well as a higher risk of dying. Consequently, all patients are treated with drugs to prevent VT but these are not always effective. If VT keeps recurring, many patients undergo an invasive procedure called catheter ablation where wires are passed into the heart from the leg and the part of the ventricles causing the VT identified. A high frequency electrical current is then passed down one of the wires making its tip heat up allowing discrete burns (ablation) to be placed on the culprit area, which stops the VT and prevents it from recurring. Performing catheter ablation in such patients is a high risk procedure and the overall complication rate is between 5 - 15% in experienced centres. Some patients have recurrent VT despite catheter ablation or the VT cannot be ablated because the patient is too frail, or the VT causes a significant fall in the blood pressure resulting in cardiac arrest (heart stops beating).

In the last 6 years, several case reports and series have been published showing that radiotherapy using different types of linear accelerator machines (including the Cyberknife) can successfully and safely ablate VT. Most recently, a prospective, randomised trial (ENCORE-VT) has reported a dramatic reduction in VT following radioablation.

This study will therefore assess our ability to perform stereotactic radioablation for VT at St Bartholomew's Hospital. We will determine procedural success and safety. Patients will be assessed 3, 6 and 12 months after the treatment and their burden of VT determined by checking the ICD.

研究の種類

介入

入学 (実際)

4

段階

  • 適用できない

連絡先と場所

このセクションには、調査を実施する担当者の連絡先の詳細と、この調査が実施されている場所に関する情報が記載されています。

研究場所

      • London、イギリス、EC1A 7BE
        • St Bartholomew's Hospital

参加基準

研究者は、適格基準と呼ばれる特定の説明に適合する人を探します。これらの基準のいくつかの例は、人の一般的な健康状態または以前の治療です。

適格基準

就学可能な年齢

18年~85年 (大人、高齢者)

健康ボランティアの受け入れ

いいえ

受講資格のある性別

全て

説明

Inclusion Criteria:

  1. They are at least 18-85 years old.
  2. They have recurrent VT (at least three episodes in the preceding six months) requiring therapy from an ICD, that is refractory to conventional treatments - both maximally tolerated doses of anti- arrhythmic drugs and/or conventional catheter ablation.
  3. They are too frail or do not wish to undergo conventional catheter ablation.
  4. They have not had previous radiotherapy to the anticipated treatment field.

Exclusion Criteria:

  1. They have polymorphic VT or ventricular fibrillation (VF).
  2. They have inotrope-dependent heart failure or a left ventricular assist device (LVAD) in situ.
  3. They are unlikely to live more than 12 months irrespective of the VT.
  4. There is a potentially reversible cause for the VT e.g. critical coronary artery disease or a metabolic problem such as an overactive thyroid gland.
  5. They are unable to provide informed consent.
  6. They have had previous radiotherapy to the anticipated treatment field.
  7. The patient weighs in excess of 170kg (maximum weight capacity of the tables in the imaging department).

研究計画

このセクションでは、研究がどのように設計され、研究が何を測定しているかなど、研究計画の詳細を提供します。

研究はどのように設計されていますか?

デザインの詳細

  • 主な目的:処理
  • 割り当て:なし
  • 介入モデル:単一グループの割り当て
  • マスキング:なし(オープンラベル)

武器と介入

参加者グループ / アーム
介入・治療
実験的:Treatment arm

Treatment with stereotactic ablative radiotherapy

Stereotactic ablative radiotherapy will be delivered to a volume of ventricular myocardium responsible for the clinical ventricular tachycardia.

この研究は何を測定していますか?

主要な結果の測定

結果測定
メジャーの説明
時間枠
Change in quality of life and cardiac complications as assessed by clinical history, SF-36 questionnaire, electrocardiogram and echocardiography.
時間枠:3 months

The number of serious adverse events at three months after treatment. This will be determined as follows:

  1. Clinical history from and examination of the patients assessing for new chest pains, breathlessness or coughing.
  2. SF-36 quality of life questionnaire.
  3. Echocardiography to assess for pericardial effusion that could indicate radiation-induced pericarditis.
  4. Electrocardiogram to assess for pericarditis or myocarditis caused by radiation.
3 months
Efficacy endpoint - Cumulative VT burden 6 months before and 6 months after radiotherapy.
時間枠:6 months

There will be a six week blanking period after radiotherapy to allow for ablation effect. The burden of VT will be assessed by interrogating the patient's ICD and assessing the number of episodes of non-sustained and sustained VT as well as the number of ICD therapies delivered.

6 months

二次結果の測定

結果測定
メジャーの説明
時間枠
VT burden
時間枠:6 months

Cumulative VT burden in the second 6 months following radiotherapy. This will be assessed by ICD interrogation as described above.

6 months
Survival
時間枠:12 months

Overall survival at 3, 6 and 12 months following radiotherapy.

12 months
Cardiac function changes from radiotherapy
時間枠:12 months

Absolute change in numerical left ventricular ejection fraction assessed with echocardiography, at 3, 6 and 12 months.

12 months
Radiotherapy impact on ICD function
時間枠:12 months

Deterioration in implantable cardioverter-defibrillator function attributable to radiotherapy at 3, 6 and 12 months. This will be determined by interrogating the ICD and measuring the change in ICD defibrillator lead impedance.

12 months
Quality of life assessment using SF-36 questionnaire
時間枠:12 months

The SF-36 questionnaire will be used at 3, 6 and 12 months to assess this.

12 months
Heart failure status using New York Heart Association (NYHA) breathlessness class.
時間枠:12 months

Patients will be assessed at 3, 6 and 12 months by taking a history for breathlessness, scaled I to IV according to their NYHA class.

12 months
Cardiac conduction system status measured by ECG QRS duration.
時間枠:12 months

An electrocardiogram will be performed at 3, 6 and 12 months to look for any changes in the QRS complex duration.

12 months

協力者と研究者

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研究記録日

これらの日付は、ClinicalTrials.gov への研究記録と要約結果の提出の進捗状況を追跡します。研究記録と報告された結果は、国立医学図書館 (NLM) によって審査され、公開 Web サイトに掲載される前に、特定の品質管理基準を満たしていることが確認されます。

主要日程の研究

研究開始 (実際)

2023年1月12日

一次修了 (実際)

2025年5月2日

研究の完了 (実際)

2026年5月2日

試験登録日

最初に提出

2022年2月21日

QC基準を満たした最初の提出物

2023年1月13日

最初の投稿 (実際)

2023年1月25日

学習記録の更新

投稿された最後の更新 (実際)

2026年9月22日

QC基準を満たした最後の更新が送信されました

2026年9月18日

最終確認日

2026年9月1日

詳しくは

本研究に関する用語

その他の研究ID番号

  • 262246

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