The heart is the main organ o fthe human body and the most vital one, and as such can withstand even the most serious conditions. Coronary heart disease is among the leaders in Croatia in the number of patients and with a more fatal outcome. Acute myocardial infarction is complication ofi schemic heart disease caused by coronary artery occlusion by thrombus formation. It leads to the interruption of blood flow to the heart muscle and the formation of necrosis at the affected site. Risk factors for myocardial infarction are: smoking, high blood sugar, obesity, stress. They can be treated with medication and special diet. Geneticeoredisoosition, genderabd age arebfactorsthatwe are unable to control. Laboratoryanalyzes, electrocardiography, ergometry, holter are includedinthediagnosticproceduresthat are performed. Treatmentcanbe operative andconservative. Whenconservativetreatmentdoesnotlead to improvement, myocardialrevascularizationwillbeconsidered. It is achievedby PCI or percutaneouscoronaryinterventionaimed at dilatingcloggedarteriesandrestoringbloodflow to theheartmuscle. Based on theclinicalexamination, anamnesticdata, diagnostic. Adecision is made on myocardialrevascularization. Prior to the procedure, qualitypreparation is carriedout, on whichthefinalresultofthe procedure willdepend. Goodpreparation is considered to beinformingthepatientaboutthebasicsoftreatment, explainingthemeaningoffollowingpreoperativeprocedures, acquaintingthepatientwiththe procedure anditsmethodofexecution, anditspossibleconsequences.