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

1 de setembro de 2026 atualizado por: 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.

Visão geral do estudo

Status

Recrutamento

Condições

Descrição detalhada

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.

Tipo de estudo

Observacional

Inscrição (Estimado)

50

Contactos e Locais

Esta seção fornece os detalhes de contato para aqueles que conduzem o estudo e informações sobre onde este estudo está sendo realizado.

Contato de estudo

  • Nome: Manuel Granell Gil Prof.
  • Número de telefone: +34 609232031
  • E-mail: margry@uv.es

Locais de estudo

      • Valencia, Espanha
        • Recrutamento
        • Hospital General Valencia
        • Contato:
          • Prof. Manuel Granell, Dr
          • Número de telefone: +34 609232031
          • E-mail: margry@uv.es

Critérios de participação

Os pesquisadores procuram pessoas que se encaixem em uma determinada descrição, chamada de critérios de elegibilidade. Alguns exemplos desses critérios são a condição geral de saúde de uma pessoa ou tratamentos anteriores.

Critérios de elegibilidade

Idades elegíveis para estudo

  • Filho
  • Adulto
  • Adulto mais velho

Aceita Voluntários Saudáveis

Não

Método de amostragem

Amostra de Probabilidade

População do estudo

Surgical population

Descrição

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

Plano de estudo

Esta seção fornece detalhes do plano de estudo, incluindo como o estudo é projetado e o que o estudo está medindo.

Como o estudo é projetado?

Detalhes do projeto

Coortes e Intervenções

Grupo / Coorte
Longitudinal study
Repeated measurements design

O que o estudo está medindo?

Medidas de resultados primários

Medida de resultado
Descrição da medida
Prazo
Change in corrected carotid artery flow (ccFT) in association with cardiorespiratory changes and volume expansion during lung resection surgery
Prazo: 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)

Medidas de resultados secundários

Medida de resultado
Descrição da medida
Prazo
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
Prazo: 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.
Prazo: 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
Prazo: 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
Prazo: 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.
Prazo: 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)

Colaboradores e Investigadores

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Patrocinador

Colaboradores

Datas de registro do estudo

Essas datas acompanham o progresso do registro do estudo e os envios de resumo dos resultados para ClinicalTrials.gov. Os registros do estudo e os resultados relatados são revisados ​​pela National Library of Medicine (NLM) para garantir que atendam aos padrões específicos de controle de qualidade antes de serem publicados no site público.

Datas Principais do Estudo

Início do estudo (Real)

27 de janeiro de 2025

Conclusão Primária (Estimado)

17 de dezembro de 2026

Conclusão do estudo (Estimado)

15 de março de 2027

Datas de inscrição no estudo

Enviado pela primeira vez

30 de junho de 2026

Enviado pela primeira vez que atendeu aos critérios de CQ

1 de setembro de 2026

Primeira postagem (Real)

9 de setembro de 2026

Atualizações de registro de estudo

Última Atualização Postada (Real)

9 de setembro de 2026

Última atualização enviada que atendeu aos critérios de controle de qualidade

1 de setembro de 2026

Última verificação

1 de setembro de 2026

Mais Informações

Termos relacionados a este estudo

Outros números de identificação do estudo

  • Registro:24/2023

Informações sobre medicamentos e dispositivos, documentos de estudo

Estuda um medicamento regulamentado pela FDA dos EUA

Não

Estuda um produto de dispositivo regulamentado pela FDA dos EUA

Não

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