Respiratory Mechanics

Abstract

SIGLAS ABREVIATURAS C. vital Capacidad vital C.S. respiratorio Compliance del sistema respiratorio CaO2 Concentración arterial de oxígeno CcO2 Contenido capilar de oxígeno CO2 Dióxido de carbono COVID-19 Enfermedad causada por el coronavirus 2019 (por sus siglas en inglés) Cpulmón "Compliance" o distensibilidad del pulmón CRF Capacidad residual funcional CvO2 Contenido venoso de oxígeno Cw Caja torácica por sus silgas en inglés

Prediction of static compliance of the respiratory system based on anthropometric measurements in patients on mechanical ventilation: a cross-sectional study

“…The present study revealed median Crs values below the those reported as normal in other studies 2,4 and established a correlation with variables such as height and age, along with sex, to construct a predictive equation for Crs. However, the model exhibited a low R 2 value.…”

“…In this context, the prediction of lung mechanics is crucial for its rst estimation or during daily measurements. This value can aid in assessing the impact of diagnoses of acute conditions (atelectasis, Acute Respiratory Distress Syndrome [ARDS], Acute Obstructive Abdomen, pneumonia and pulmonary congestion) or chronic conditions (Chronic Obstructive Pulmonary Disease [COPD], pulmonary brosis, obesity and sequelae of major infections) 2,4,13 . Additionally, it can help in determining better PEEP levels to relationship between elastic pressure and lung expansibility (using decremental PEEP maneuver 14 ), thereby guiding the safe selection of ventilation parameters.…”

“…The evaluation of quasi-static respiratory mechanics has evolved signi cantly since the rst experiments by Von Neergaard and Wirtz in 1927 1 , followed by evaluations with pneumotachographs and direct assessment puncture of pleural pressure, sensitive and advanced software that calculates variations in pressures, volumes and ows at the bedside during the use of mechanical ventilation (MV) 2 . Currently, for easier implementation, respiratory mechanics evaluation calculations estimate the principle of onecompartment lung model, assuming that all aspects of the evaluated parenchyma follow something close to homogeneity.…”

“…In effort to personalize these values in initial patient assessments, a reference range for normal Crs was previously suggested to be between 50 and 70 ml/cmH 2 O. However, these values were not derived from descriptive population studies and may have overlooked signi cant variables such as Predicted Body Weight (PBW), which is calculated based on the patient's height and sex 2,4 . Thus, due to the absence of studies addressing the individuality of Crs through suitable reference values for height and/or PBW, the present study aimed to pragmatically describe Crs measurements in patients admitted to ICUs, determine the relationship between Crs/PBW, and propose a mathematical equation model to predict these values.…”

Assessment and determining factors of the awareness and knowledge of healthcare providers about Cardiogenic Oscillations and its effect on mechanically ventilated patients: A multivariate logistic modeling

“…COs are considered to be an intrinsic cause of automatic ventilator triggering; moreover, they may be visible on ventilator signal waveforms during apnea, and they are thought to be due to changes in the cardiac output and physical movement of the heart during each ventricular systole (Aarrestad, 2020;Mac-Intyre et al, 2021). The change in intrathoracic pressure caused by airflow and the displacement of adjacent lung tissue play a role in automatic ventilator triggering (Noujeim et al, 2013;Zhou et al, 2021). This phenomenon can occur both in a patient with brain death and in a patient without brain death.…”