Purpose is to show that HHHFNC method is as effective and safe as nCPAPand even more comfortable than it as non-invasive respiratory support for the prevention of extubation failure in preterm with gestational age of 26-32 weeks.
Patients requiring mechanical ventilation for at least 6 hours on the first 7 postnatal days will be included in the study.When patients were Fi O2 \< 0,40, Pa CO2 \< 65 mmHg, pH\> 7.20, MAP (mean airway pressure) \<7 cm H2O, they will be extubated if statistically stable.Oxygen-air mixture of 4-6 l / min flow rate will be set in HHHFNC group, and pressure will be set to 5-8 cm H2O in NCPAP group. When flow is 2 l / min, FiO2 is\<0.30 at 24 hours and above, free oxygen will be introduced. In NCPAP group, when pressure is 5 cm H2O and FiO2 \< 0.30 at 24 hours and above, free oxygen will be introduced.