Spirometry is a lung function test, whose main objective is to evaluate lung mechanics. It is a test that is currently easily accessible, but little used by anesthesiologists. One cause may be that they are not familiar with the analysis and understanding of said test or the lack of a pulmonary physiology laboratory in their hospitals. The proper analysis and understanding of this test by the general and thoracic anesthetist offers a range of possibilities both for the perioperative evaluation of the patient with pulmonary pathology or the one who will undergo thoracic surgery. Having a great impact by influencing the prognosis and management of these patients.

Orthotopic liver transplantation is one of the greatest challenges faced by the anesthesiologist, therefore, the importance of a correct pre-anesthetic assessment, in order to bring the patient to the most optimal level possible, based on the clinical characteristics that This can present as a result of the different pathophysiological changes that liver disease entails in multiple systems: neurological, pulmonary, cardiac, renal, coagulation status, fragility, and nutritional status. In addition, it will allow a correct staging of both the disease and the risks related to the surgical act, in order to be able to designate the best strategy adapted to the particular needs of each patient.