Comparison of NonInvasive Ventilation and Bag Valve Mask Preoxygenation on Oxygen Levels in Critically Ill Patients Undergoing Endotracheal Intubation

INTERVENTION: Intervention1: non invasive ventilation preoxygenation: eligible icu patients will receive preoxygenation using non‐invasive ventilation prior to endotracheal intubation niv will be administered according to the icu protocol using an appropriate interface and oxygen settings preoxygenation will be provided for the specified duration before induction and intubation, total 6 months of intervention Control Intervention1: BagValveMask Preoxygenation : Eligible ICU patients will receive preoxygenation using a bag valve mask device with supplemental oxygen prior to endotracheal intubation according to standard ICU practice Preoxygenation will be provided for the specified duration before induction and intubation,total 6 months of study CONDITION: Health Condition 1: J00‐J99‐ Diseases of the respiratory system PRIMARY OUTCOME: Saturation and capnographyTimepoint: Oxygen saturation measured by pulse oximetry. it will be assessed at baseline before preoxygenation, immediately after the preoxygenation period, during endotracheal intubation, and immediately after successful endotracheal intubation. SECONDARY OUTCOME: Heart rate, respiration rate, blood pressure, abg,Timepoint: Oxygen saturation measured by pulse oximetry it will be assessed at baseline before preoxygenation immediately after the preoxygenation period during endotracheal intubation & immediately after successful endotracheal intubation INCLUSION CRITERIA: Adult patients aged 20 years and above Patients requiring planned elective endotracheal intubation for airway management.