RAQUEL SIQUEIRA NOBREGA
Projetos de Pesquisa
Unidades Organizacionais
SVFOFITO-62, Hospital Universitário
5 resultados
Resultados de Busca
Agora exibindo 1 - 5 de 5
- Nonlinear Flow Sensor Calibration with an Accurate Syringe(2018) BISELLI, Paolo Jose Cesare; NOBREGA, Raquel Siqueira; SORIANO, Francisco GarciaFlow sensors are required for monitoring patients on mechanical ventilation and in respiratory research. Proper calibration is important for ensuring accuracy and can be done with a precision syringe. This procedure, however, becomes complex for nonlinear flow sensors, which are commonly used. The objective of the present work was to develop an algorithm to allow the calibration of nonlinear flow sensors using an accurate syringe. We first noticed that a power law equation could properly fit the pressure-flow relationship of nonlinear flow sensors. We then developed a software code to estimate the parameters for this equation using a 3 L syringe (calibration syringe). Finally, we tested the performance of a calibrated flow sensor using a different 3 L syringe (testing syringe) and a commercially available spirometer. After calibration, the sensor had a bias ranging from -1.7% to 3.0% and precision from 0.012 L to 0.039 L for volumes measured with the 3 L testing syringe. Calibrated sensor performance was at least as good as the commercial sensor. This calibration procedure can be done at the bedside for both clinical and research purposes, therefore improving the accuracy of nonlinear flow sensors.
conferenceObject Intrinsic Positive End Expiratory Pressure (peepi) Measurement In Spontaneously Breathing Patients Using Conditioned Central Venous Pressure (cvp) Signal(2016) BISELLI, P. J. C.; NOBREGA, R. S.conferenceObject A New Method For Measuring Oxygen Consumption (vo2): Avoiding The Need For Flow And Oxygen Signals Synchronization(2016) NOBREGA, R. S.; BISELLI, P. J. C.conferenceObject conferenceObject Measuring Changes in Respiratory Effort Using Central Venous Pressure in Patients on Non-invasive Ventilation After Extubation(2023) BISELLI, P. J.; NOBREGA, R. S.