Random sampling and Random allocation: In order to select individuals and assign them to two groups of intervention and comparison, three steps are performed in the form of access sampling, class allocation and simple random allocation, respectively. To do this, first, people with cardiovascular disease referred to Ali Ibn Abitaleb Hospital who meet the inclusion criteria are selected by available sampling. Since in some cases, despite the application of randomization program, there is also the possibility of heterogeneity in some of the initial features in the groups, so using the method Classification on Effective Variables Attempts to eliminate heterogeneity in groups are made before random allocation. In this study, age and sex are very important factors in observing education and improving oxygen delivery, so to ensure the equal distribution of these two variables in the two intervention and comparison groups, based on gender and age of people with four entry criteria, including men And females are more or less equal to 50 years, and then the samples in each class by a simple randomization method Using the Randomization.com website, which is available to researchers for free, they are divided into experimental and control groups. For example, in men over the age of 50, a list of random sequences such as the following sequence is generated and then, based on the number of people entering the study, people are divided into two groups of intervention and comparison.