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To verify the susceptibility of ventricle to arrhythmia after bone marrow mononuclear cell transplantation (BMMNCT), we measured ventricular fibrillation threshold (VFT) and monophasic action potential duration (MAYD90). Lewis rats with doxorubicin-induced cardiomyopathy were divided into 2 groups: transplantation group (D-TX: BMMNC (1 × 106) given transplants into the apex at 4 weeks after doxorubicin administration) and nontransplantation group (D-N). Age-matched normal group (N-N) was prepared. At 4 weeks after BMMNCT, the following electrophysiologic tests were performed. Experiment 1 (VFT): Two stainless wires were placed at the apex and a single train of 10 square wave stimuli was delivered across T wave. The lowest current developing ventricular fibrillation was determined as VFT. Experiment 2 (MAPD90): The catheter was inserted into the left ventricle and pressed against the endocardium near the apex under regular cycle lengths. Experiment 1: VFT of D-TX and D-N were significantly lower than that of N-N (p < 0.01). There was no difference between D-TX and D-N. Experiment 2: MAYD90 of each group was lined up in length D-N>D-TX>N-N at every cycle lengths. There was a significant difference between D-N and N-N (p < 0.01), and D-TX and N-N (p < 0.05). In this model, BMMNCT did not increase susceptibility to arrthythmia.