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Effect of Cardiorespiratory Changes on Carotid Flow Time During Lung Resection Surgery

2026年9月1日 更新者:Manuel Vicente Granell Gil、University of Valencia

Noninvasive Perioperative Hemodynamic Monitoring In Thoracic Surgery: A Prospective Observational Study

Cardiorespiratory changes during lung resection surgery, even though generally well tolerated, may lead to hemodynamic compromise, reducing venous return to the heart and hence cardiac output.

Carotid corrected flow time is widely regarded as non-invasive index of preload status, yet its dynamic relationship with cardiac output, especially in surgical population is not well-studied. Understanding how cardiorespiratory changes affect carotid flow time in anesthesized patients remains limited. This study investigates corrected carotid flow time response to anesthesia, lateral position, one-lung ventilation, open chest, capnothorax, lung recruitment and volume expansion, hypothesizing that cFT declines in association with CO reduction during lung resection.

The secondary interest of the study is to test whether carotid flow time and its recruitment-induced change can adequately predict fluid response during one-lung ventilation. In addition, the baseline preoperative carotid flow time and its position-induced change are studied as potential predictors of hemodynamic tolerance to lung recruitment and fluid response, respectively.

Finally, the purpose of this study is to see if cardiorespiratory changes and volume expansion affect cerebral blood volume during lung resection surgery.

調査の概要

状態

募集

条件

詳細な説明

In this study investigators look at intraoperative trajectory of secondary variables (hemodynamic and ventilatory) during cardiorespiratory changes and volume expansion to provide clinical context for primary variable response. A comparative analysis of all variables is performed in patients with different sex, ventilation protocol, operative side, tolerance to recruitment and fluid responsiveness.

研究の種類

観察的

入学 (推定)

50

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:Manuel Granell Gil Prof.
  • 電話番号:+34 609232031
  • メール:margry@uv.es

研究場所

      • Valencia、スペイン
        • 募集
        • Hospital General Valencia
        • コンタクト:
          • Prof. Manuel Granell, Dr
          • 電話番号:+34 609232031
          • メール:margry@uv.es

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

  • 子
  • 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

確率サンプル

調査対象母集団

Surgical population

説明

Inclusion Criteria:

  • patients scheduled to undergo thoracosocpic lung resection surgery

Exclusion Criteria:

  • carotid stenosis or abnormal anatomy of carotid artery that prevents visualization, emphysema, arrythmia

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
Longitudinal study
Repeated measurements design

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
Change in corrected carotid artery flow (ccFT) in association with cardiorespiratory changes and volume expansion during lung resection surgery
時間枠:enrollment phase (up to 2 years)

Doppler ultrasonography measurements are performed repeatedly at following timepoints: awake (seated), awake (supine), after intubation, after lateral decubitus position, after transition to one-lung ventilation, after pleura opening, after carbon dioxide insufflation, before lung recruitment, after first highest PEEP, after second highest PEEP, after optimal PEEP, before and after volume expansion.

Statistical analysis: within-patient change (Friedman, Wilcoxon signed rank), correlation

enrollment phase (up to 2 years)

二次結果の測定

結果測定
メジャーの説明
時間枠
Diagnostic accuracy of corrected carotid flow time (ccFT) and recruitment - induced change in carotid corrected flow time (delta ccFTRM) in discriminating fluid responders during one-lung ventilation
時間枠:enrollment phase (up to 2 years)

Corrected carotid flow time (ccFT) is measured by Doppler ultrasonography immediately before volume expansion (VE) and 5 min after it.

Recruitment - induced change in carotid corrected flow time (delta cFTRM) is calculated from measurments obtained by Doppler utrasonography immediately before recruitment maneuver (RM) and at highest PEEP.

delta ccFTRM = (ccFT before RM - ccFTafter RM) / ccFT before RM

Fluid response is defined as > 15% increase in cardiac output (CO) following volume expansion (VE). Volume expansion is a 200-250 ml bolus of crystalloid solution performed after the recruitment maneuver (RM) at the discretion of attending anesthesiologist. Measurements are obtained by pulse contour analysis after immediately before volume expansion (VE) and 5 min after it.

Stat- ROC curve

Outcome measure - prognostic ability (AUC)of corrected carotid flow time (ccFT) and recruitment - induced change in carotid corrected flow time (delta ccFTRM) in predicting CO increase.

enrollment phase (up to 2 years)
Diagnostic accuracy of baseline preoperative carotid flow time (ccFT) in discriminating between poor and good tolerance to recruitment maneuver and preoperative position-induced change in ccFT in discriminating fluid responders and non-responders.
時間枠:enrollment phase (up to 2 years); statistical analysis (ROC); outcome measure - prognostic ability (AUC) of preoperative corrected carotid flow time (ccFT) and position - induced change in ccFT (delta ccFTRM) in predicting poor tolerance or CO increase

Baseline preoperative carotid corrected flow time (ccFT) is a preoperative carotid Doppler measurement in seated position.

Position-induced change (delta ccFT-P) is calculated from measurments obtained by Doppler utrasonography in awake seated position and within approxiamtely 10-15 minutes in awake supine position.

delta ccFTP = (ccFT awake seated - ccFTawake supine ) / ccFT awake seated

Poor tolerance to lung recruitment is defined as TWA-MAP of 20% decrease from baseline or absolute value < 65 mmHg measured during recruitment period or 10 min after. Measurements are obtained by pulse contour analysis from immediately before recruitment maneuver to 5 min after it.

Fluid response is defined as > 15% increase in cardiac output (CO) following volume expansion (VE). Volume expansion(VE) is a 200-250 ml bolus of crystalloid solution performed after the recruitment maneuver (RM) at discretion of attending anesthesiologist.

enrollment phase (up to 2 years); statistical analysis (ROC); outcome measure - prognostic ability (AUC) of preoperative corrected carotid flow time (ccFT) and position - induced change in ccFT (delta ccFTRM) in predicting poor tolerance or CO increase
Change in cerebral blood volume index (CBVIl, CBVIr) in association with cardiorespiratory changes and volume expansion during lung resection surgery
時間枠:enrollment phase (up to 2 years)

Doppler ultrasonography measurements are performed repeatedly at following timepoints: awake (seated), awake (supine), after intubation, after lateral decubitus position, after transition to one-lung ventilation, after pleura opening, after carbon dioxide insufflation, before lung recruitment, after first highest PEEP, after second highest PEEP, after optimal PEEP, before and after volume expansion.

Statistical analysis: within-patient change (Friedman, Wilcoxon signed rank), correlation (with cardiac output)

enrollment phase (up to 2 years)
Change in secondary hemodynamic and ventilatory variables in response to cardiorespiratory changes and volume expansion during lung resection surgery
時間枠:enrollment phase (up to 2 years)

Hemodynamic variables (CO, SV, MAP, HR, dP/dt, Eadyn, PI, BIS, carotid diameter, resistivity index) are obtained from pulse contour analysis/ Doppler and respiratory variables (EtCO2, Ppeak, PEEP, TV, SpO2, FiO2, RR) are obtained from mechanical ventilator continuously during the same timepoints as primary variable.

Outcome measure: all variables will be taken and reported at the following timepoints: awake (seated), awake (supine), after intubation, after lateral decubitus position, after transition to one-lung ventilation, after pleura opening, after carbon dioxide insufflation, before lung recruitment, after first highest PEEP, after second highest PEEP, after optimal PEEP, before and after volume expansion.

Statistical analysis: within-patient change (Friedman, Wilcoxon signed rank), correlation

enrollment phase (up to 2 years)
Comparative between-group analysis of primary and secondary variables in patients of different sex, ventilation protocol, operative side, recruitment tolerance and fluid response.
時間枠:enrollment phase (up to 2 years)
Hemodynamic (CO, SV, MAP, HR, dP/dt, Eadyn, PI, BIS, carotid diameter, resistivity index) are obtained from pulse contour analysis/ Doppler and respiratory variables (EtCO2, Ppeak, PEEP, TV, SpO2, FiO2, RR) will be collected at following timepoints: awake (seated), awake (supine), after intubation, after lateral decubitus position, after transition to one-lung ventilation, after pleura opening, after carbon dioxide insufflation, before lung recruitment, after first highest PEEP, after second highest PEEP, after optimal PEEP, before and after volume expansion. Comparative between-group analysis of variables response will be performed. Groups are stratified by sex, ventilation protocol, operative side, recruitment tolerance and fluid response. Statistical analysis: between-patient change (Mann-Whitney).
enrollment phase (up to 2 years)

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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 (実際)

2025年1月27日

一次修了 (推定)

2026年12月17日

研究の完了 (推定)

2027年3月15日

試験登録日

最初に提出

2026年6月30日

QC基準を満たした最初の提出物

2026年9月1日

最初の投稿 (実際)

2026年9月9日

学習記録の更新

投稿された最後の更新 (実際)

2026年9月9日

QC基準を満たした最後の更新が送信されました

2026年9月1日

最終確認日

2026年9月1日

詳しくは

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