Patients were excluded from the study when they had (a) other causes of acute hypercapnic respiratory failure; patients on sedatives; known cases of COPD; history of significant exposure to smoking (>20 pack years) or biomass fuel (>2 years); Brainstem abnormalities, neuromuscular disorders, chest wall deformities,(b) unable to apply BiPAP
due to facial deformity, burns, upper airway surgery in last six months, uncontrolled gastro intestinal haemorrhage (c) presented with cardiogenic or septic shock and systolic blood pressure less than 90 despite of vasopressor support.
Endotracheal tube was passed to all patients and was connected to NIPPV (BiPAP
ST, ResMed) via connector tube.
We presented two illustrative cases of postextubation stridor in which usual treatment failed but responded to heliox combined with BiPAP
The case was atypical because the parturient maintained good haemodynamic stability, continued to trigger the BiPAP
machine and displayed reassuring cardiotocographic features throughout, thus allowing the use of non-invasive ventilation without the need to progress to emergency caesarean section.
CPAP seems more effective than BiPAP
in ameliorating lung function.
Results of Pressure Support * Increase tidal volume * Increase minute ventilation * Decreases accesory muscle use * Decreases work of breathing BiPAP
works by combining the benefits of PSV and CPAP, and keeps the lungs open during the entire respiratory cycle (Joris et al., 1997).
Recent studies have investigated the effect of BiPAP
on heart failure.