News (Page 30)

Normal Range of Methacholine Responsiveness in Relation to Prechallenge Pulmonary Function: Analysis

Methacholine inhalation challenge testing was performed as previously described. Solutions were aerosolized by a nebulizer (DeVilbiss 646) powered by an air compressor (DeVilbiss). All inhalations were 6-s vital capacity inhalations followed by 2 s of breathholding. Seconds were counted aloud from a digital stopwatch after careful instruction and practice. Inhalations were done seated and wearing […]

Normal Range of Methacholine Responsiveness in Relation to Prechallenge Pulmonary Function

Methacholine challenge testing is currently being used as a diagnostic test for a variety of clinical indications. In patients presenting with chronic cough of uncertain cause, challenge testing has been advocated as a means to determine whether the cough is associated with airway hyperresponsiveness (“cough variant asthma”) and likely to respond to bronchodilator therapy. Methacholine […]

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 […]