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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
Studie Overzicht
Toestand
Interventie / Behandeling
Gedetailleerde beschrijving
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.
Studietype
Inschrijving (Geschat)
Contacten en locaties
Studiecontact
- Naam: qiancheng xu, PhD
- Telefoonnummer: +86-18297529106
- E-mail: qianchengxu@wnmc.edu.cn
Studie Locaties
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Wuhu, China
- Werving
- The First Affiliated Hospital of Wannan Medical College (Yijishan Hospital of Wannan Medical College)
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Contact:
- Shengsheng xu
- Telefoonnummer: 86-18315329399
- E-mail: taoshengsheng@yjsyy.com
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Deelname Criteria
Geschiktheidscriteria
Leeftijden die in aanmerking komen voor studie
- Volwassen
- Oudere volwassene
Accepteert gezonde vrijwilligers
Bemonsteringsmethode
Studie Bevolking
Beschrijving
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.
Studie plan
Hoe is de studie opgezet?
Ontwerpdetails
Cohorten en interventies
Groep / Cohort |
Interventie / Behandeling |
|---|---|
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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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Wat meet het onderzoek?
Primaire uitkomstmaten
Uitkomstmaat |
Maatregel Beschrijving |
Tijdsspanne |
|---|---|---|
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Change in Ventilation-Perfusion Matching Index
Tijdsspanne: 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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Secundaire uitkomstmaten
Uitkomstmaat |
Maatregel Beschrijving |
Tijdsspanne |
|---|---|---|
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Change in Peripheral Oxygen Saturation
Tijdsspanne: 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
Tijdsspanne: 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
Tijdsspanne: 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
Tijdsspanne: 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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Medewerkers en onderzoekers
Studie record data
Bestudeer belangrijke data
Studie start (Werkelijk)
Primaire voltooiing (Geschat)
Studie voltooiing (Geschat)
Studieregistratiedata
Eerst ingediend
Eerst ingediend dat voldeed aan de QC-criteria
Eerst geplaatst (Werkelijk)
Updates van studierecords
Laatste update geplaatst (Werkelijk)
Laatste update ingediend die voldeed aan QC-criteria
Laatst geverifieerd
Meer informatie
Termen gerelateerd aan deze studie
Trefwoorden
Andere studie-ID-nummers
- 2026-ICU04
Plan Individuele Deelnemersgegevens (IPD)
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