Pulmonary function: change in forced expiratory volume in 1 s and change in forced ventilatory capacity 25 (trough, peak and average) and other measures of pulmonary function.
At the end of NIV, the forced ventilatory capacity (FVC) and the forced expiratory volume at the first second (FEV1)/FVC ratio were significantly increased compared with the basal value: FVC 47.9 ± 11.0% basal, 55.3 ± 15.6% after NIV, P = 0.02; FEV1/FVC 68.5 ± 17.1 basal, 59.3 ± 15.2 after NIV, P = 0.007.
Spinal arthrodesis was systematically performed from age 12. Respiratory care started when forced vital capacity (FVC) reached 1l or 30% of the theoretical value and included nocturnal monitoring of capillary PO2 and PCO2, intermittent positive pressure ventilatory (IPPV) daily support, and nasal non invasive nocturnal ventilatory (NINV) support in case of abnormal blood gas levels.
In addition, data regarding restrictive ventilatory defect (decreased forced vital capacity, or FVC) and diffusion impairment (decreased diffusion capacity for carbon monoxide, DLCO) and how the diagnosis of IPF/UIP (biopsy or CT scan) was made were obtained from chart abstraction on the patients with IPF/UIP.
As a result, these modes FOLLOW the lead of the patient but again "do NOT force" a ventilatory pattern.
Advances in our knowledge of the pathophysiology of respiratory failure have forced major revisions of our approach to ventilatory support.
If there is an improvement in oxygenation after a few days, then we are forced to consider reducing the intensity of ventilatory support.
Ventilatory function, which is commonly measured by forced expired volume in 1 sec (FEV1) and forced vital capacity (FVC), reflects lung structure, airway caliber, and lung size.
Obstructive ventilatory impairment is characterized by a low forced expiratory volume/s (FEV1) with relatively normal forced vital capacity (FVC), reduction of FEV1, FVC.
Especially in the presence of central obstructive ventilatory disorders such as COPD or asthma, forced expiratory flow parameters lack reproducibility and do not correlate well with other variables related to airway obstruction (as forced vital capacity, FVC and residual volume-total lung capacity index, (RV/TLC) [ 6, 7].
A pulmonary function test showed restrictive ventilatory impairment (vital capacity (VC) 2.16 L; %VC 60.7%; forced vital capacity (FVC) 2.33 L; forced expiratory volume in 1 s (FEV1) 2.25 L; FEV1/FVC 96.6%).
