Peran pemeriksaan creatine kinase total dan aktivitas creatine kinase-MB dalam diagnosis infark miokard dan prognosis terjadinya major adverse cardiac event pada sindrom koroner akut dengan penyakit ginjal kronis = The Role of total creatine kinase and creatine kinase-MB activity for the diagnosis of myocardial infarction and prognosis of major adverse cardiac event in acute coronary syndrome patient with chronic kidney disease