Search results for "Respiratory cycle"
showing 3 items of 3 documents
Exercise respiratory cycle time components in patients with emphysema
2012
Background: We have recently demonstrated that in patients with COPD the severity of emphysema (E) measured by high resolution computed tomography (HRCT) correlated with: ratio VTpeak/FEV1; VE/VCO2 slope and PETCO2 values at peak exercise. The aim of this study was to further investigate if exercise respiratory cycle time components correlated with % of E measured by HRCT. Method: Twelve patients (age = 65±8 yrs; FEV1 = 55±17%pred) with moderate to severe E (quantified by lung HRCT as % voxels 50% and <50%), we observed that patients with higher % of E had longer TeM (TeM: 1,72±0,26sec vs 1,34±0,27sec, p = 0,005) and TeM-end. A good linear correlation has been observed also between TeM and …
Patient-Ventilator Asynchronies: Clinical Implications and Practical Solutions
2020
Mechanical ventilation is a supportive treatment commonly applied in critically ill patients. Whenever the patient is spontaneously breathing, the pressure applied to the respiratory system depends on the sum of the pressure generated by the respiratory muscles and the pressure generated by the ventilator. Patient-ventilator interaction is of utmost importance in spontaneously breathing patients, and thus the ventilator should be able to adapt to patient's changes in ventilatory demand and respiratory mechanics. Nevertheless, a lack of coordination between patient and ventilator due to a mismatch between neural and ventilator timing throughout the respiratory cycle may make weaning difficul…
Respiratory Mechanics and Gas Exchange in Thoracic Surgery: Changes in Classical Knowledge in Respiratory Physiology
2020
Respiratory mechanics describe the lung function through pressure and flow and the interplay between the two during the respiratory cycle. Derived indices are volume, compliance and resistance (Hess, Respir Care 59(11):1773–1794, 2014). Thoracic surgery in most cases requires the separation of the lungs in order to allow surgery of or near one lung and ventilation of the other lung, while the perfusion to the non-ventilated lung is continued. This has profound implications for the gas exchange and respiratory mechanics.