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

1. září 2026 aktualizováno: 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.

Přehled studie

Postavení

Nábor

Podmínky

Detailní popis

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.

Typ studie

Pozorovací

Zápis (Odhadovaný)

50

Kontakty a umístění

Tato část poskytuje kontaktní údaje pro ty, kteří studii provádějí, a informace o tom, kde se tato studie provádí.

Studijní kontakt

  • Jméno: Manuel Granell Gil Prof.
  • Telefonní číslo: +34 609232031
  • E-mail: margry@uv.es

Studijní místa

      • Valencia, Španělsko
        • Nábor
        • Hospital General Valencia
        • Kontakt:
          • Prof. Manuel Granell, Dr
          • Telefonní číslo: +34 609232031
          • E-mail: margry@uv.es

Kritéria účasti

Výzkumníci hledají lidi, kteří odpovídají určitému popisu, kterému se říká kritéria způsobilosti. Některé příklady těchto kritérií jsou celkový zdravotní stav osoby nebo předchozí léčba.

Kritéria způsobilosti

Věk způsobilý ke studiu

  • Dítě
  • Dospělý
  • Starší dospělý

Přijímá zdravé dobrovolníky

Ne

Metoda odběru vzorků

Ukázka pravděpodobnosti

Studijní populace

Surgical population

Popis

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

Studijní plán

Tato část poskytuje podrobnosti o studijním plánu, včetně toho, jak je studie navržena a co studie měří.

Jak je studie koncipována?

Detaily designu

Kohorty a intervence

Skupina / kohorta
Longitudinal study
Repeated measurements design

Co je měření studie?

Primární výstupní opatření

Měření výsledku
Popis opatření
Časové okno
Change in corrected carotid artery flow (ccFT) in association with cardiorespiratory changes and volume expansion during lung resection surgery
Časové okno: 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)

Sekundární výstupní opatření

Měření výsledku
Popis opatření
Časové okno
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
Časové okno: 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.
Časové okno: 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
Časové okno: 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
Časové okno: 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.
Časové okno: 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)

Spolupracovníci a vyšetřovatelé

Zde najdete lidi a organizace zapojené do této studie.

Sponzor

Spolupracovníci

Termíny studijních záznamů

Tato data sledují průběh záznamů studie a předkládání souhrnných výsledků na ClinicalTrials.gov. Záznamy ze studií a hlášené výsledky jsou před zveřejněním na veřejné webové stránce přezkoumány Národní lékařskou knihovnou (NLM), aby se ujistily, že splňují specifické standardy kontroly kvality.

Hlavní termíny studia

Začátek studia (Aktuální)

27. ledna 2025

Primární dokončení (Odhadovaný)

17. prosince 2026

Dokončení studie (Odhadovaný)

15. března 2027

Termíny zápisu do studia

První předloženo

30. června 2026

První předloženo, které splnilo kritéria kontroly kvality

1. září 2026

První zveřejněno (Aktuální)

9. září 2026

Aktualizace studijních záznamů

Poslední zveřejněná aktualizace (Aktuální)

9. září 2026

Odeslaná poslední aktualizace, která splnila kritéria kontroly kvality

1. září 2026

Naposledy ověřeno

1. září 2026

Více informací

Termíny související s touto studií

Další identifikační čísla studie

  • Registro:24/2023

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