This study was done in order to help alleviate or prevent the anxiety resulting from cardiac catheterization among adult patients. This goal may be reached through providing relaxation techenique to the patients. Such an informativeness would make if possible to establish a basis for comprehensive nursing intervention. The results of this study are summarized as follows: 1. The first hypothesis; "The experimental group with relaxation informativeness will have less score of state anxiety level before cardiac catheterization than the control group without relaxation informativeness" was accepted. (t=3.72, p=.001). 2. The second hypothesis; "The experimental group with relaxation technique informativeness will have less score of distress level during the procedure than the control group without relaxation technique informativeness" was accepted. (t=2.36, p=.023) 3. Additional analysis; It is seen that most cardiac patients were satisfied with precardiac catheterization procedure information provided by medical teams. (experimental group: 90%, control group: 85%) The relaxation technique informativeness contributed to the decrease of anxiety level. Patients showed interest in reusing the relaxation technique informativeness in the event of further need. in conclusion, the researcher thinks that it is necessary that nurses provide patients with relaxation technique to reduce the anxiety level with cardiac catheterization. This will enable them to practice effective comprehensive nursing.