To compare the anesthetic efficacy of the inhalation versus intravenous technique for maintenance of sedation in patients undergoing endoscopy.

A longitudinal, randomized clinical study of 32 patients of both sexes ASA I-III, aged 18-80 years undergoing diagnostic colonoscopy, which was randomly divided into 2 groups. In both, intravenous induction with propofol (2-2.5 mg / kg) was performed, Group A remained sedated with propofol infusion (1-2 mg / kg / min); Group B by inhalation with sevoflurane at a concentration of 2 vol% through a nasal cannula with an oxygen flow.

Inclusion Criteria:

• Age between 18 and 80 years
• physical status I, II and III according to the criteria of the American Society of Anesthesiology (ASA)
• patients who are going to undergo diagnostic colonoscopies
• patients who signed the informed consent

Exclusion Criteria:

• Allergy or hypersensitivity to some of the reference drugs in the study
• patients with proven liver disease
• suspicion or confirmation of pregnancy
• antecedent or risk of malignant hyperthermia
• fasting less than 8 hours
• patients with psychic disorders or mental incapacity that make it difficult to understand their participation in the study
• patients who have acute illnesses that compromise their health for which the study cannot be performed