Tag: mechanical ventilation

Canadian Health&Care Mall: Inspiratory Muscle Unloading

Neurally adjusted ventilatory assist (NAVA) is a mode of mechanical ventilation in which positive pressure is applied to the airway opening in proportion to the electrical activation of the diaphragm (EAdi).1 With NAVA, ventilator support is initiated when the neural drive to the diaphragm begins to increase. As the EAdi progressively increases, the assist increases […]

Relationship Between Expired Capnogram and Respiratory System Resistance in Critically III Patients During Total Ventilatory Support – Conclusion

Respiratory system resistance, as it was measured in the present study, represented total airflow resistance of the respiratory system, also including the resistance of the endotracheal tube and ventilator equipment. At given values of lung and airways resistance, total Rrs may considerably vary breathing through different sized endotracheal tubes.- Moreover, Wright and coworkers have demonstrated […]

Relationship Between Expired Capnogram and Respiratory System Resistance in Critically III Patients During Total Ventilatory Support – Discussion

Precise knowledge of Rrs in patients receiving mechanical ventilation is needed for adequate clinical management. In intubated patients with normal lungs, the value of Rrs is usually less dian 4 cm H20/L/s, excluding the flow-resistive properties of the endotracheal tube and equipment. The contribution of these later components to the Rrs could be as high […]

Relationship Between Expired Capnogram and Respiratory System Resistance in Critically III Patients During Total Ventilatory Support – Data Analysis

Samples of blood were drawn in heparin-rinsed plastic syringes and were immediately analyzed for oxygen and carbon dioxide tensions (ABL 500, Radiometer Copenhagen, Copenhagen, Denmark). An on-line infrared C02 analyzer (HP78556A, Palo Alto, Calif) was used to continuously monitor C02 partial pressure changes and was placed between the distal port of the disposable humidifier and […]

Relationship Between Expired Capnogram and Respiratory System Resistance in Critically III Patients During Total Ventilatory Support – Methods

Modern ventilator monitoring includes the measurement of airway pressures and derived intermittent calculations such as respiratory system resistance (Rrs). Patients in the ICU receiving mechanical ventilation often exhibit high Rrs due to bronchospasm, structural airway abnormalities, low lung volume, and retained bronchial secretions both attached to the airways or to the wall of the endotracheal […]