The objective of this experimental study is to determine if the application of a nursing educational intervention reduces the anxiety of patients who are going to undergo treatment in the hyperbaric chamber.

The researchers will compare the nursing educational intervention with the usual practice that is currently carried out in the unit for patients who are going to begin treatment in the hyperbaric chamber.

Participants will:

• Receive explanatory information through a camera triptych when the treatment is indicated.
• Come half an hour before the first session to receive a nursing educational intervention, with audiovisual support, on the operation of the camera.

The objective of this experimental study is to determine if the application of a nursing educational intervention reduces the anxiety of patients who are going to undergo treatment in the hyperbaric chamber.

An educational intervention will be applied to the intervention group that will begin on the same day that the treatment is indicated. That day, you will be given an informative brochure about the most important aspects you should know about the hyperbaric chamber. On the first day of the session, you will be asked to come half an hour early to explain, in more detail, what the hyperbaric chamber consists of and important aspects that you should take into account.

The control group will receive the same intervention that is currently being carried out. Once treatment is prescribed in the chamber, they come on the first day and receive a brief explanation of how it works before entering.

Inclusion Criteria:

• Results in the Pfeiffer questionnaire<2.
• That they understand Spanish or Catalan

Exclusion Criteria:

• That feel fear inside the hyperbaric chamber.