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Total antioxidant activity status (TAS) represents the body's response to oxidative stress, important in the pathogenic assessment of oxidations. Aim: To determine TAS variations in young subjects, with non-lesional cardiac arrhythmias, with/without dyslipidemia and to assess the risk of lipid oxidation. Patients and methods: The research was performed on 120 young subjects (mean age 33 years), with various types of cardiac arrhythmias, on normal heart, without co-existing lesions. Subjects were divided into 3 groups (40 persons). The first 2 groups included subjects with cardiac arrhythmias. Group I also associated dyslipidemia; group II, without dyslipidemia and group III: control. Determination of TAS values was performed using ABTS (2-azino-di-3-ethylbenzthiazoline sulfonate) colorimetic method. Results were statistically processed. Results: TAS values were decreased in all patients with cardiac arrhythmias, representing 52-54% of the values of healthy controls, the data being highly statistically significant. The variation of TAS decrease by types of arrhythmias was thus found in patients with arrhythmias and associated dyslipidemia and, respectively, without dyslipidemia, compared to controls. The deficit of antioxidant activity, between 48%-46% triggers electrochemical processes with implications in arrhythmogenesis and lipid oxidation. Coffee and vegetables-rich diet have antioxidant effect, reducing TAS deficiency. Conclusions: 1. TAS was decreased in all subjects with non-lesional arrhythmias. The study showed decreasing TAS level at 52-54% in patients with arrhythmias, with/without dyslipidemia, compared to controls. 2. TAS deficiency was associated with various types of dysrhythmias, ranging from 62% to 33%. 3. Decreased TAS also triggers lipid oxidation, as risk factor for early atherosclerotic lesions. [ABSTRACT FROM AUTHOR]