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Shear Wave Elastography of Peripheral Nerves for Early Diagnosis of ICU-acquired Weakness

2026年6月13日 更新者:Qiancheng Xu、First Affiliated Hospital of Wannan Medical College

Clinical Value of Shear Wave Elastography of Peripheral Nerves for the Early Diagnosis of ICU-Acquired Weakness: A Prospective Observational Pilot Study

This study aims to determine whether shear wave elastography (SWE), a non-invasive ultrasound technique that measures nerve stiffness, can help detect ICU-acquired weakness (ICU-AW) early in critically ill patients. Adults receiving mechanical ventilation in the ICU will undergo ultrasound examinations of the median and tibial nerves on Days 1, 4, and 7. The study will evaluate whether early changes in nerve elasticity can predict ICU-AW, which is usually diagnosed later using a muscle strength score that requires patient cooperation.

調査の概要

状態

まだ募集していません

条件

介入・治療

詳細な説明

Intensive Care Unit-Acquired Weakness (ICU-AW) is a common and severe complication in critically ill patients, associated with poor long-term outcomes. The current gold standard for diagnosis, the Medical Research Council (MRC) score, requires patient cooperation and is often delayed.

Shear Wave Elastography (SWE) is an advanced ultrasound technique that quantitatively measures tissue stiffness. Pathophysiological changes in ICU-AW, such as axonal degeneration and edema in nerves, are expected to alter their biomechanical properties (elasticity). This study posits that these changes may be detectable early using SWE, preceding overt clinical weakness.

This study will prospectively enroll adult patients admitted to the ICU who are expected to require prolonged mechanical ventilation. Participants will undergo serial ultrasound examinations of the median and tibial nerves on days 1, 4, and 7 of their ICU stay. The examinations will include SWE to measure nerve elasticity (stiffness) and conventional B-mode ultrasound to measure nerve cross-sectional area (CSA).

On day 7, all consenting and cooperative patients will be assessed for ICU-AW using the MRC score. The primary objective is to determine the diagnostic accuracy of early nerve SWE measurements for predicting the diagnosis of ICU-AW on Day 7. Secondary objectives include describing the dynamic changes in nerve elasticity and size over the first week, and exploring the correlation between these ultrasound parameters and clinical severity scores and patient outcomes.

研究の種類

観察的

入学 (推定)

98

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。

研究連絡先

  • 名前:qiancheng xu, PhD
  • 電話番号:+86-18297529106
  • メール:xu19871011@163.com

研究場所

    • Anhui
      • Wuhu、Anhui、中国、241001
        • The First Affiliated Hospital of Wannan Medical College (Yijishan Hospital of Wannan Medical College)
        • コンタクト:

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

  • 大人
  • 高齢者

健康ボランティアの受け入れ

いいえ

サンプリング方法

非確率サンプル

調査対象母集団

Critically ill adults on mechanical ventilation with an anticipated ICU stay greater than 7 days.

説明

Inclusion Criteria:

  1. Age ≥ 18 years;
  2. Newly admitted to ICU with an expected ICU stay > 7 days;
  3. Initiated on mechanical ventilation within 24 hours of admission, with an expected ventilation duration > 48 hours;
  4. Patient or legally authorized representative provides written informed consent.

Exclusion Criteria:

  1. Known pre-existing neuromuscular diseases (e.g., myasthenia gravis, Guillain-Barré syndrome, amyotrophic lateral sclerosis);
  2. Pre-existing limb dysfunction that would interfere with muscle strength assessment (e.g., hemiplegia, paraplegia, severe arthritis);
  3. Presence of acute trauma, surgery, skin breakdown, infection, or severe edema at the measurement sites (wrist, elbow, ankle) that would interfere with ultrasound probe placement;
  4. Pregnant or lactating women;
  5. Any other condition that the investigator believes would make the patient unsuitable for the study.

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

コホートと介入

グループ/コホート
介入・治療
ICU Patients on Mechanical Ventilation
A cohort of adult patients newly admitted to the ICU who are receiving mechanical ventilation and are at risk for developing ICU-Acquired Weakness.
Patients will undergo non-invasive ultrasound examinations of the median nerve and tibial nerve at the bedside on days 1, 4, and 7. The examination includes Shear Wave Elastography (SWE) to quantify nerve stiffness (elasticity) and B-mode imaging to measure nerve cross-sectional area (CSA). This is a purely observational procedure and does not alter patient management.

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
Diagnostic Accuracy of Nerve SWE on Day 1 for Predicting ICU-AW on Day 7
時間枠:Day 1 and Day 7 after ICU admission

Area Under the Receiver Operating Characteristic Curve (AUC) for the mean elasticity value (measured in kilopascals, kPa) of the median and tibial nerves, assessed separately at three time points after ICU admission:

Day 1 - to predict ICU-AW diagnosed on Day 7

Day 7 - for concurrent diagnosis of ICU-AW (elastography and MRC assessed independently, blinded to each other)

ICU-Acquired Weakness (ICU-AW) is defined as a Medical Research Council (MRC) sum score of less than 48 points.

Day 1 and Day 7 after ICU admission
Diagnostic Accuracy of Nerve SWE on Day 4 for Predicting ICU-AW on Day 7
時間枠:Day 4 and Day 7 after ICU admission

Area Under the Receiver Operating Characteristic Curve (AUC) for the mean elasticity value (measured in kilopascals, kPa) of the median and tibial nerves, assessed separately at three time points after ICU admission:

Day 4 - to predict ICU-AW diagnosed on Day 7

Day 7 - for concurrent diagnosis of ICU-AW (elastography and MRC assessed independently, blinded to each other)

ICU-Acquired Weakness (ICU-AW) is defined as a Medical Research Council (MRC) sum score of less than 48 points.

Day 4 and Day 7 after ICU admission
Diagnostic Accuracy of Nerve SWE on Day 7 for Diagnosing ICU-AW on Day 7
時間枠:Day 7 after ICU admission

Area Under the Receiver Operating Characteristic Curve (AUC) for the mean elasticity value (measured in kilopascals, kPa) of the median and tibial nerves, assessed separately at three time points after ICU admission:

Day 7 - for concurrent diagnosis of ICU-AW (elastography and MRC assessed independently, blinded to each other)

ICU-Acquired Weakness (ICU-AW) is defined as a Medical Research Council (MRC) sum score of less than 48 points.

Day 7 after ICU admission

二次結果の測定

結果測定
メジャーの説明
時間枠
Change in Nerve Elasticity
時間枠:Day 1 to Day 7 after ICU admission
Absolute and relative change in the shear wave elastography (SWE) value (in kPa) of the median and tibial nerves from baseline (Day 1) to Day 7.
Day 1 to Day 7 after ICU admission
Correlation between Nerve Elasticity and Disease Severity
時間枠:Day 7
Spearman's correlation coefficient will be calculated to assess the relationship between the baseline (Day 7) nerve SWE values and the baseline Sequential Organ Failure Assessment (SOFA) score.
Day 7

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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 (推定)

2026年7月1日

一次修了 (推定)

2027年6月30日

研究の完了 (推定)

2027年6月30日

試験登録日

最初に提出

2026年5月11日

QC基準を満たした最初の提出物

2026年5月14日

最初の投稿 (実際)

2026年5月18日

学習記録の更新

投稿された最後の更新 (実際)

2026年6月16日

QC基準を満たした最後の更新が送信されました

2026年6月13日

最終確認日

2026年6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

  • 2026-ICU01

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