This document summarizes information from a presentation on chronic total occlusions (CTOs) and multivessel disease (MVD) in acute coronary syndromes and chronic coronary syndromes. It provides data on the prevalence of CTOs in different patient populations, ranging from 10% in ACS to over 15% in elective angiography and 90% after CABG. In the SYNTAX trial, about 35.7% of patients with MVD also had a CTO. Successful recanalization of a CTO after ACS is associated with increased survival. Treatment of CTOs in patients with MVD and chronic coronary syndromes requires consideration of factors like which lesion to treat first, the ability to access lesions ante