This prospective and observational cohort studies the morphine consumption difference during the first 48 hours after a lung lobectomy between patients operated with a robot assisted or a video-assisted technique for a lung cancer lobectomy.

Second outcome was to search eventual cardiac output difference during the surgery in 100 patients (50 in each group) using a non invasive monitoring device of cardiac output

All patients operated between january 2016 and March 2017 for a lung cancer lobectomy were included.

Inclusion Criteria:

• Volunteers
• Mono lobectomy of lung for early stage cancer (T2Nx and earlier)
• Video or robot assisted procedure

Exclusion Criteria:

• Advanced stage of cancer (T3Nx and greater)
• Need of thoracotomy conversion during procedure
• Morphine intolerance or addiction.

All patients needing a lung lobectomy surgery for an early stage cancer in our center during the period of inclusion.