Objective: determination of effect of deep-slow and regular breathing on pain intensity after chest tube removal in patients underwent Coronary hospitalized in Imam Ali-Design: randomized controlled clinical trial. Setting and conduct: required sample size is 140 patients. Eligible patients will be allocated to one of the two groups of deep-slow and regular breathing and control group by randomization-Inclusion criteria include Consent to participate in the study, age between 25 to 65 years, stable vital signs, The ability to speak and understand the language, conscious of the place, time and person ,No take sedative and analgesic four hours before pulling the chest tube, No history of diabetes, No respiratory infection or infection chest tube, No history of drug addiction, No history of previous chest surgery had a chest tube lateral or bilateral, having at least one chest-Exclusion criteria include Patients who do not continue cooperation until the end of intervention, critically ill patient during the study; death the patient's-Interventions: In order to gather data in both group pain intensity using a visual analog scale, two minutes after dressing removal chest tube will be assessed and after the intervention group be asked, deep-slow and regular breathing for 15 minutes and Control group will receive routine cares. Again pain intensity in both groups using a VAS, 15 minutes after removal of the chest tube, will be assessed by the investigator-The main outcome variables: pain intensity.