This study evaluated the practice before and after the introduction of a particular model pulsoxymeter giving, in addition, information on the state of fluid responsiveness of the patient.

This study aims to qualify the capability of general anesthesiologist to adopt Pleth Variability Index (PVI) into their practice. It also seeks to establish whether the introduction of the PVI in the clinical practice is associated with a modification of the practice. In this scope, the intent is to see the impact of introduction of PVI monitoring on anesthesiologist practices, and to do this by comparing their survey response both before and after use of PVI in their surgeries, and to see how clinical practices for GDT and outcomes may have changed. To that end, the intent is to conduct this at sites with no current experience in use of PVI parameter, so that one can closely follow the change in clinician practice as PVI is adopted.

Inclusion Criteria:

• Patients over 18 years
• ASA 1 to 3

Exclusion Criteria:

• ASA 4

The plan will seek to recruit a minimum of 3 centers in Belgium and/or France who have little to no prior PVI experience, each institution requiring about a minimum of 10 participating anesthesiologists for that institution. As it may be difficult to locate a center without Masimo technology, the goal is to locate a center not actively in use with PVI technology for managing fluid responsiveness, and the clinicians are not actively consulting with Masimo