Changes in Regional Ventilation-Perfusion Match Following Percutaneous Transluminal Angioplasty for Arteriovenous Graft Thrombosis
Changes in Regional Ventilation-Perfusion Match Following Percutaneous Transluminal Angioplasty for Arteriovenous Graft Thrombosis: A Prospective Observation Pilot Study
調査の概要
詳細な説明
Arteriovenous graft (AVG) thrombosis is a major source of vascular access failure in ESRD. PTA restores patency through balloon dilation and mechanical thrombus compression. Minor embolic debris can reach the pulmonary bed, transiently disturbing perfusion distribution and V/Q matching. Because the pulmonary circulation is sensitive to sudden peripheral hemodynamic shifts, the PTA period provides a unique opportunity to observe lung perfusion response dynamically.
This single-center, prospective, observational pilot study will continuously record regional ventilation and perfusion by EIT at six time points: 10 min before PTA, at recanalization, and 10, 20, 30 min after, and at procedure completion. Measured variables include: V/Q matching index (primary), physiological dead space fraction (Vd/Vt), intrapulmonary shunt fraction, SPO₂/FiO₂ ratio, and hemodynamic data (balloon pressure, recanalization time, blood flow recovery). Results will be analyzed using repeated-measures ANOVA or mixed-effects modeling.
研究の種類
入学 (推定)
連絡先と場所
研究連絡先
- 名前:qiancheng xu, PhD
- 電話番号:+86-18297529106
- メール:qianchengxu@wnmc.edu.cn
研究場所
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Wuhu、中国
- 募集
- The First Affiliated Hospital of Wannan Medical College (Yijishan Hospital of Wannan Medical College)
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コンタクト:
- Shengsheng xu
- 電話番号:86-18315329399
- メール:taoshengsheng@yjsyy.com
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参加基準
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
サンプリング方法
調査対象母集団
説明
Inclusion Criteria
- Age ≥ 18 years.
- Diagnosis of end-stage renal disease receiving maintenance hemodialysis.
- Documented AVG thrombosis requiring PTA.
- Able to cooperate and tolerate EIT monitoring.
- Provided written informed consent.
Exclusion Criteria
- Severe respiratory failure incompatible with supine position.
- Thoracic skin condition or deformity preventing EIT electrode placement.
- Acute pulmonary embolism or acute pulmonary edema before procedure.
- NYHA Class IV heart failure or hemodynamic instability.
- Pregnancy or breastfeeding.
- Any other circumstance judged unsuitable by investigator.
研究計画
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 |
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Observation Cohort
All enrolled patients will undergo clinically indicated PTA under standard care.
EIT monitoring will be performed continuously before, during, and after recanalization to record regional ventilation and perfusion data.
No experimental drug or device will be administered beyond routine care.
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Non-invasive 16-electrode EIT belt applied at the 4th intercostal level.
Continuous data acquisition begins 10 min pre-PTA, continues throughout balloon angioplasty, and up to 30 min post-recanalization.
No alteration to standard clinical care.
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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 |
|---|---|---|
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Change in Ventilation-Perfusion Matching Index
時間枠:Baseline (10 min before PTA), immediate post-recanalization, 10, 20, 30 minutes, and procedure end.
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Quantitative index derived from EIT ventilation and perfusion maps, indicating spatial regional correlation of air and blood flow distribution.
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Baseline (10 min before PTA), immediate post-recanalization, 10, 20, 30 minutes, and procedure end.
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二次結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
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Change in Peripheral Oxygen Saturation
時間枠:Baseline (10 min before PTA), immediate post-recanalization, 10, 20, 30 minutes, and procedure end.
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Baseline (10 min before PTA), immediate post-recanalization, 10, 20, 30 minutes, and procedure end.
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Change in Physiological Dead Space Fraction
時間枠:Baseline (10 min before PTA), immediate post-recanalization, 10, 20, 30 minutes, and procedure end.
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Ratio of physiologic dead space to tidal volume, calculated by EIT validated algorithm, reflecting inefficiency of ventilation.
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Baseline (10 min before PTA), immediate post-recanalization, 10, 20, 30 minutes, and procedure end.
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Change in Intrapulmonary Shunt Fraction
時間枠:Baseline (10 min before PTA), immediate post-recanalization, 10, 20, 30 minutes, and procedure end.
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Percentage of the lung region showing perfusion without ventilation, estimated from EIT perfusion signals.
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Baseline (10 min before PTA), immediate post-recanalization, 10, 20, 30 minutes, and procedure end.
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Change in Regional Ventilation and Perfusion Distribution
時間枠:Baseline (10 min before PTA), immediate post-recanalization, 10, 20, 30 minutes, and procedure end.
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Variation in spatial patterns of pulmonary ventilation and perfusion derived from pixel-based EIT data.
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Baseline (10 min before PTA), immediate post-recanalization, 10, 20, 30 minutes, and procedure end.
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協力者と研究者
研究記録日
主要日程の研究
研究開始 (実際)
一次修了 (推定)
研究の完了 (推定)
試験登録日
最初に提出
QC基準を満たした最初の提出物
最初の投稿 (実際)
学習記録の更新
投稿された最後の更新 (実際)
QC基準を満たした最後の更新が送信されました
最終確認日
詳しくは
本研究に関する用語
その他の研究ID番号
- 2026-ICU04
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