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Correlation between corrected carotid flow time and left ventricular outflow tract velocity-time integral using a novel technique.
Cheong, Issac; Merlo, Pablo Martín; Tamagnone, Francisco Marcelo.
Afiliación
  • Cheong I; Department of critical care medicine, Sanatorio De los Arcos, Buenos Aires, Argentina.
  • Merlo PM; Argentinian Critical Care Ultrasonography Association (ASARUC), Buenos Aires, Argentina.
  • Tamagnone FM; Argentinian Critical Care Ultrasonography Association (ASARUC), Buenos Aires, Argentina.
J Clin Ultrasound ; 2024 Sep 18.
Article en En | MEDLINE | ID: mdl-39291774
ABSTRACT

BACKGROUND:

Transthoracic echocardiography (TTE) is widely used for assessing patients in the intensive care unit, with cardiac output measurement being crucial for hemodynamic monitoring. This is achieved by measuring the velocity-time integral (VTI) of the left ventricular outflow tract (LVOT), which serves as a surrogate of stroke volume. However, conducting TTE in the critical care setting presents several challenges. Our primary objective was to investigate the relationship between carotid corrected flow time (cCFT) and LVOT VTI. Additionally, we aimed to determine the threshold cCFT value that reliably predicts a normal LVOT VTI. MATERIALS AND

METHODS:

This proof-of-concept study involves a post-hoc analysis from a diagnostic accuracy investigation conducted in a medical-surgical intensive care unit. We included patients admitted to the ICU from December 2021 to January 2022. We used a phased array transducer to measure the cCFT at the left supraclavicular fossa and the LVOT VTI in an apical 5-chamber view.

RESULTS:

We included 22 patients. The Spearman coefficient between LVOT VTI and cCFT was 0.82 (p < 0.0001). The area under the ROC curve for cCFT to predict LVOT VTI equal to or greater than 17 cm was 0.871 (95% CI 0.660-0.974). A cCFT exceeding 283 ms predicted LVOT VTI equal to or greater than 17 cm with a sensitivity of 93.3% (95% CI 68.1% to 99.8%) and specificity of 85.7% (95% CI 42.1% to 99.6%).

CONCLUSION:

The cCFT, measured using a novel technique with a phased array transducer, shows a strong correlation with LVOT VTI. Additionally, cCFT predicts a normal LVOT VTI with good sensitivity and specificity in critically ill patients. Larger studies are warranted to validate these findings.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Clin Ultrasound Año: 2024 Tipo del documento: Article País de afiliación: Argentina Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Clin Ultrasound Año: 2024 Tipo del documento: Article País de afiliación: Argentina Pais de publicación: Estados Unidos