Shear Wave Elastography of Peripheral Nerves for Early Diagnosis of ICU-acquired Weakness
Clinical Value of Shear Wave Elastography of Peripheral Nerves for the Early Diagnosis of ICU-Acquired Weakness: A Prospective Observational Pilot Study
연구 개요
상태
상세 설명
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.
연구 유형
등록 (추정된)
연락처 및 위치
연구 연락처
- 이름: qiancheng xu, PhD
- 전화번호: +86-18297529106
- 이메일: xu19871011@163.com
연구 장소
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Anhui
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Wuhu, Anhui, 중국, 241001
- The First Affiliated Hospital of Wannan Medical College (Yijishan Hospital of Wannan Medical College)
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연락하다:
- Shengsheng Tao
- 전화번호: 86-18315329399
- 이메일: taoshengsheng@yjsyy.com
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참여기준
자격 기준
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- 고령자
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샘플링 방법
연구 인구
설명
Inclusion Criteria:
- Age ≥ 18 years;
- Newly admitted to ICU with an expected ICU stay > 7 days;
- Initiated on mechanical ventilation within 24 hours of admission, with an expected ventilation duration > 48 hours;
- Patient or legally authorized representative provides written informed consent.
Exclusion Criteria:
- Known pre-existing neuromuscular diseases (e.g., myasthenia gravis, Guillain-Barré syndrome, amyotrophic lateral sclerosis);
- Pre-existing limb dysfunction that would interfere with muscle strength assessment (e.g., hemiplegia, paraplegia, severe arthritis);
- 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;
- Pregnant or lactating women;
- Any other condition that the investigator believes would make the patient unsuitable for the study.
공부 계획
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디자인 세부사항
코호트 및 개입
그룹/코호트 |
개입 / 치료 |
|---|---|
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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.
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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.
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연구는 무엇을 측정합니까?
주요 결과 측정
결과 측정 |
측정값 설명 |
기간 |
|---|---|---|
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Diagnostic Accuracy of Nerve SWE on Day 1 for Predicting ICU-AW on Day 7
기간: Day 1 and Day 7 after ICU admission
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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
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Diagnostic Accuracy of Nerve SWE on Day 4 for Predicting ICU-AW on Day 7
기간: Day 4 and Day 7 after ICU admission
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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
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Diagnostic Accuracy of Nerve SWE on Day 7 for Diagnosing ICU-AW on Day 7
기간: Day 7 after ICU admission
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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
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2차 결과 측정
결과 측정 |
측정값 설명 |
기간 |
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Change in Nerve Elasticity
기간: Day 1 to Day 7 after ICU admission
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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.
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Day 1 to Day 7 after ICU admission
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Correlation between Nerve Elasticity and Disease Severity
기간: Day 7
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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.
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Day 7
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공동 작업자 및 조사자
연구 기록 날짜
연구 주요 날짜
연구 시작 (추정된)
기본 완료 (추정된)
연구 완료 (추정된)
연구 등록 날짜
최초 제출
QC 기준을 충족하는 최초 제출
처음 게시됨 (실제)
연구 기록 업데이트
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QC 기준을 충족하는 마지막 업데이트 제출
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추가 정보
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