There is no study in the literature that determined the effect of relaxing breathing exercise applied to patients before the BMB procedure on vital signs, pain and anxiety levels.

The aim of this study is to determine the effect of relaxing breathing exercise applied to patients before bone marrow biopsy on vital signs, pain and anxiety levels.

hypotheses H1. Relaxing breathing exercise applied to the patients before the bone marrow biopsy procedure reduces the anxiety level of the patients compared to the control group.

H2. Relaxing breathing exercise applied to the patients before the bone marrow biopsy procedure reduces the pain level of the patients compared to the control group.

H3. Relaxing breathing exercise applied to the patients before the bone marrow biopsy procedure is effective on the respiratory rate of the patients compared to the control group.

H4. Relaxing breathing exercise applied to the patients before the bone marrow biopsy procedure is effective on the pulse rate of the patients compared to the control group.

H5. Relaxing breathing exercise applied to the patients before the bone marrow biopsy procedure is effective on the blood pressure of the patients compared to the control group.

• Being between the ages of 18-65
• The fact that a bone marrow biopsy will be performed for the first time
• Absence of sedative, anxiolytic drug use
• Absence of a situation that would hinder communication.