Intraoperative Ultrasound Assessment of Coronary Artery and Bypass Graft Blood Flow During CABG
Quantitative Assessment of Native Coronary Artery and Bypass Graft Blood Flow Using Intraoperative Ultrasound in Patients Undergoing Coronary Artery Bypass Grafting: A Single-Centre Prospective Feasibility and Safety Study
This single-centre, prospective observational feasibility and safety study will enrol 190 consecutive adults undergoing elective isolated coronary artery bypass grafting (CABG) at Nanjing Drum Tower Hospital. The study aims to evaluate the feasibility and safety of intraoperative ultrasound for the quantitative assessment of native coronary artery and bypass graft blood flow.
Transit-time flow measurement will be performed as part of routine intraoperative graft assessment. Additional ultrasound measurements will be obtained from major native coronary arteries before and after revascularisation and from bypass grafts after restoration of blood flow. The ultrasound findings will be collected for research purposes and will not influence graft revision or other intraoperative clinical decisions.
The co-primary outcomes are the participant-level technical success rate of the protocol-defined intraoperative ultrasound assessment and the incidence of adverse events related to the ultrasound device or measurement procedure. Secondary outcomes include agreement between ultrasound and transit-time flow measurements, changes in native coronary artery blood flow after revascularisation, measurement repeatability, and exploratory associations between intraoperative flow parameters and postoperative cardiac function and myocardial injury biomarkers. Participants will be followed for 30 ± 7 days after surgery.
調査の概要
詳細な説明
Intraoperative assessment of bypass graft function is important for ensuring adequate myocardial revascularisation during coronary artery bypass grafting. Transit-time flow measurement is widely used for graft assessment but primarily evaluates blood flow within bypass grafts and provides limited information on changes in native coronary artery blood flow before and after revascularisation.
This study will evaluate a portable ultrasound platform with access to programmable raw radiofrequency data. The study-specific procedure consists of additional intraoperative ultrasound measurements obtained from the exposed epicardial surface without additional incision, vascular puncture or tissue penetration. Major native coronary arteries will be assessed before and after revascularisation, and individual bypass grafts will be assessed after completion of the graft anastomoses and restoration of blood flow. Transit-time flow measurements will be recorded according to routine clinical practice for subsequent agreement analyses.
The research ultrasound findings will not be used to guide graft revision, repeat anastomosis or other intraoperative clinical decisions. The study is designed to evaluate technical feasibility, safety, agreement with transit-time flow measurement, measurement repeatability and changes in native coronary artery blood flow. Associations between intraoperative flow parameters and postoperative cardiac function and myocardial injury biomarkers will be exploratory.
研究の種類
入学 (推定)
連絡先と場所
研究連絡先
- 名前：Zhikang Lv, MD
- 電話番号：+8615258021027
- メール：lvzhikang1996@163.com
研究連絡先のバックアップ
- 名前：Qiang Wang, MD
- 電話番号：+8615850573193
- メール：njuwangqiang@163.com
研究場所
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Jiangsu
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Nanjing、Jiangsu、中国、210008
- Nanjing Drum Tower Hospital, Affiliated Hospital of Nanjing University Medical School
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コンタクト：
- Zhikang Lv, MD
- 電話番号：+8615258021027
- メール：lvzhikang1996@163.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:
- Aged 18 years or older.
- Confirmed coronary artery disease and scheduled to undergo elective isolated coronary artery bypass grafting at Nanjing Drum Tower Hospital.
- Able and willing to provide written informed consent before any study-specific procedures are performed.
Exclusion Criteria:
- Urgent, emergency, or salvage coronary artery bypass grafting.
- Prolonged preoperative fasting, as defined in the study protocol, or inability to maintain adequate oral intake without enteral or parenteral nutritional support.
- History of malignancy.
- Body weight below 50 kg.
- Preoperative hemodynamic instability requiring ongoing resuscitation or mechanical circulatory support, including intra-aortic balloon pump, extracorporeal membrane oxygenation, or left ventricular assist device support.
- Endotracheal intubation and invasive mechanical ventilation before surgery.
- Impaired consciousness, clinically significant central nervous system dysfunction, or evidence of cerebral malperfusion after hospital admission.
- End-stage renal disease requiring maintenance dialysis before hospital admission.
- Severe pulmonary disease considered to preclude tolerance of elective coronary artery bypass grafting or to confer an unacceptably high perioperative risk.
- Severe peripheral vascular disease or clinical evidence of limb malperfusion before surgery.
- History of gastrointestinal ulceration or chronic inflammatory gastrointestinal disease.
- Chronic inflammatory or autoimmune disease, or long-term treatment with systemic corticosteroids or non-steroidal anti-inflammatory drugs.
- Active infection or sepsis at screening.
- Severe uncontrolled arrhythmia requiring urgent treatment or expected to cause marked intraoperative hemodynamic instability.
- Previous cardiac surgery requiring repeat median sternotomy.
- Planned concomitant major cardiac or aortic surgery, including valve surgery, congenital heart defect repair, or aortic surgery.
- Inability to understand the study information or unwillingness or inability to provide written informed consent.
- Inability or unwillingness to complete follow-up at 30 ± 7 days after surgery.
- Pregnancy or breastfeeding.
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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Intraoperative Ultrasound CABG Cohort
This cohort will prospectively include adults undergoing elective isolated coronary artery bypass grafting.
Ultrasound-derived blood flow parameters of native coronary arteries and bypass grafts will be collected at prespecified intraoperative time points.
Transit-time flow measurements, perioperative data, postoperative cardiac function and myocardial injury biomarkers will also be collected.
No parallel control cohort will be established, and the research ultrasound findings will not influence intraoperative clinical decision-making.
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Intraoperative ultrasound measurements of major native coronary arteries will be obtained before and after revascularisation, followed by measurements of individual bypass grafts after restoration of blood flow.
Recorded variables will include blood flow velocity, volumetric blood flow and other protocol-defined quantitative parameters.
The findings will be collected for research purposes and will not guide graft revision or other intraoperative clinical decisions.
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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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Participant-Level Technical Success Rate of the Protocol-Defined Intraoperative Ultrasound Assessment
時間枠：During the coronary artery bypass grafting procedure
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The proportion of enrolled participants with analysable quantitative flow parameters obtained from ultrasound measurements of at least two major native coronary arteries both before and after revascularisation and from all protocol-specified independent bypass grafts.
Failure to initiate or complete a protocol-defined measurement, visualise a required target vessel, obtain a stable flow signal, or generate analysable data will be classified as technical failure and retained in the denominator.
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During the coronary artery bypass grafting procedure
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Incidence of Adverse Events Related to the Intraoperative Ultrasound Device or Measurement Procedure
時間枠：From the first intraoperative ultrasound measurement to 30 ± 7 days after surgery
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The proportion of participants with any adverse event judged by the investigator as possibly, probably, or definitely related to the intraoperative ultrasound device or measurement procedure.
Prespecified events of special interest include a new or worsened sustained arrhythmia requiring treatment; clinically significant haemodynamic instability; bleeding or tissue injury attributable to probe contact or manipulation; native coronary artery, graft, or anastomotic injury; interruption or clinically meaningful prolongation of surgery attributable to ultrasound measurement; device malfunction posing a patient safety risk; and other related events as judged by the investigator.
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From the first intraoperative ultrasound measurement to 30 ± 7 days after surgery
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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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Agreement Between Intraoperative Ultrasound and Transit-Time Flow Measurements
時間枠：During CABG, after completion of graft anastomoses and restoration of blood flow
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Agreement between comparable bypass graft blood flow parameters obtained using intraoperative ultrasound and transit-time flow measurement will be evaluated in grafts with analysable paired measurements using intraclass correlation coefficients and Bland-Altman analysis.
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During CABG, after completion of graft anastomoses and restoration of blood flow
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Mean Within-Vessel Change in Ultrasound-Derived Volumetric Blood Flow of Native Coronary Arteries Before and After Revascularisation
時間枠：During CABG: immediately before revascularisation and after completion of graft anastomoses following haemodynamic stabilisation
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Volumetric blood flow will be measured in the same analysable segments of the left anterior descending, left circumflex, and right coronary arteries immediately before revascularisation and after completion of graft anastomoses following haemodynamic stabilisation.
For each analysable native coronary artery, the within-vessel change will be calculated as post-revascularisation volumetric blood flow minus pre-revascularisation volumetric blood flow.
The native coronary artery will be the unit of analysis, and the mean of all analysable vessel-level change values will be reported in mL/min.
Positive values indicate increased blood flow after revascularisation.
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During CABG: immediately before revascularisation and after completion of graft anastomoses following haemodynamic stabilisation
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Repeatability of Intraoperative Ultrasound Blood Flow Measurements
時間枠：During the coronary artery bypass grafting procedure
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Repeatability of intraoperative ultrasound-derived quantitative blood flow parameters will be evaluated using repeated measurements obtained at the same vascular measurement site.
Intraclass correlation coefficients, coefficients of variation, repeatability coefficients, and Bland-Altman limits of agreement will be calculated.
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During the coronary artery bypass grafting procedure
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Association of Intraoperative Blood Flow Parameters With Postoperative Cardiac Function and Myocardial Injury Biomarkers
時間枠：From the preoperative baseline assessment to 30 ± 7 days after surgery
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Associations between intraoperative ultrasound-derived native coronary artery and bypass graft blood flow parameters and postoperative measures of cardiac function, cardiac structure, and myocardial injury will be explored.
Planned measures include left ventricular ejection fraction, left ventricular end-diastolic diameter, B-type natriuretic peptide or N-terminal pro-B-type natriuretic peptide, cardiac troponin T or cardiac troponin I, and other protocol-defined measures.
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From the preoperative baseline assessment to 30 ± 7 days after surgery
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協力者と研究者
捜査官
- 主任研究者：Qiang Wang, MD、Nanjing Drum Tower Hospital, Affiliated Hospital of Nanjing University Medical School
研究記録日
主要日程の研究
研究開始 (推定)
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
キーワード
その他の研究ID番号
- NJGH-CABG-US2026
- 12274220 (その他の助成金/資金番号：National Natural Science Foundation of China)
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