Target trial emulation
A total of 65 patients were included in the levosimendan group and 1369 copies of patients in the control group. The description of the target trial emulation population construction is shown in the flowchart in Fig. Flow diagram of the nested trials cohort. A nested trial was emulated each day (D) a patient received levosimendan since beginning of ECMO supportIn the nested trials population, patients receiving levosimendan had lower BMI (median 25, Q1–Q3 [22–28] versus 27, Q1–Q3 [23–31], 