After obtaining approval from the Institutional Ethics Committee, patients with a known diagnosis of CA oesophagus/ stomach who are posted for VATS esophagectomy at our institution will be recruited. A written informed consent from the patient will be obtained and demographic information about each patient including age, sex, weight, and height will be obtained from the charts. On the day of the surgery, the patient will be induced as per the choice of the concerned anaesthesiologist. The initial ventilation mode shall be kept as pressure controlled to achieve tidal volume of 5 ml/kg. Respiratory rate shall be titrated to maintain ETCo2 between 35 and 45. Post induction, information such as the duration of surgery, approach (Ivor Lewis/ McKewon) ventilatory parameters (tidal volumes, respiratory rate, peak pressures, PEEP, compliance, FiO2, oxygen saturation, end-tidal carbon dioxide), capnothorax parameters (insufflation pressure, flow rate), surgeons’ comfort about visibility of structures by using a 5 point Likert scale, and post-operative events (ICU stay, respiratory complications within one-week prolonged hospital stay) will also be noted.