Background & Aim: One of the most prevalent methods of diagnostic and treatment of heart diseases is cardiac catheterization , that increases cardiac hemodynamic amounts of heart patients. The purpose of this study is determining the effect of Benson muscle relaxation on cardiac hemodynamic amounts in patients candidated for cardiac catheterization.

Material & Methods: This research is quasi-experimental study that 118 patients candidated cardiac catheterization at cardiac wards of Tehran Imam Khomeini hospital investigated in two groups: test and control. Data collection tools included papers of sample characterization, observations and records of hemodynamic amounts. After providing necessary preparations for patients, Benson muscle relaxation tape is recorded by researcher's voice and recorded tape and head phone were given to test group patients to use them For 20 minutes , and cardiac hemodynamic amounts includes systolic blood pressure, diastolic blood pressure and pulse rate were examined before and after intervention. In control group, these amounts were measured and recorded one hour and immediately before cardiac catheterization. The data were analyzed by descriptive and deductive statistic tests.

Results: The result showed that there was a statistical significant differences between cardiac hemodynamic amounts (systolic blood pressure ,diastolic blood pressure and pulse rate)(p<0/001).

Conclusion: Benson muscle relaxation is effective in decreasing the amounts of cardiac hemodynamic in patients candidated cardiac catheterization and so it is recommended that this method is used as a complementary tool before cardiac catheterization operation.

It is therefore recommended that this methodbe used complement preoperative cardiac catheterization.