<prompt> A patient is on mechanical ventilation in Intensive Care unit ICU, ventilator show alarms for increase in both peak and plateau pressure during inspiration. This indicates:Obstruction of tracheal tubeDecrease in distensibility of lungs and chest wallAcute bronchospasmIncrease compliance of lungs  <response>: Ans. a Obstruction of Tracheal tubeRef : Handbook of Mechnical ventilation 2nd ed.Complications of IntubationPerioperative Esophageal intubation: This is a hazardous complication. If not detected in time, can cause severe hypoxia and even death. Ischemia, edema and necrosis at local site especially with red rubber tubes. Aspiration if cuff is not properly inflated. Bronchial intubation and collapse of other lung. Tracheal tube obstruction by secretions, kinking. Accidental extubation Trauma to gums, lip, epiglottis, pharynx, larynx and nasal cavity in nasal intubation. Reflex disturbances like laryngospasm, bronchospasm, breath holding. Cardiac arrhythmias, hypertension or even cardiac arrest. 