Tran Duy Anh's study on 115 patients with IABP, showed: NYHA IV: 76 patients (66.08%), cardiogenic shock 24.34%), EF: 35.7 ± 5.2% Cardiogenic shock: Timing of cardiogenic shock after myocardial infarction was 8.5 (1 - 75) hours, this result is similar to some authors, recording cardiogenic shock 20 usually occurs 5 - 10 hours after MI: SHOCK trial, SHOCK registry, GUSTO-IIb trial, Konstantina Bouki's study in 2003.