Bacground: Myeloperoxidase (MPO) is a strong oxidant and toxic to microorganisms with excess production causing tissue damage. We aimed to determine the effect of N-acetylcysteine (NAC) 600 mg orally 3 times a day for 3 consecutive days on MPO levels and left ventricle myocardial performance index (LVMPI/Tei index) in ST elevation myocardial infarction (STEMI) patients treated with fibrinolytics.
Methods: Pre- and post-design, single blind experimental randomized trial, conducted on 32 patients with STEMI at Intensive Cardiovascular Care Unit (ICVCU). The subjects were divided into 2 groups: 17 patients received 600 mg t.i.d NAC for 72 hours and 15 controls. MPO levels before and after 72 hours and Tei index 72 hours after NAC therapy were measured. Statistical analysis of MPO level and Tei index were analyzed with SPSS 22. Tei index was measured using the pulsed wave Doppler (PWD) and tissue Doppler imaging (TDI).Results: NAC administration showed decrease in the marker of MPO (112.76±57.28 vs 180.40±69.03, p=0.001) and delta MPO (-50.15±46.62 vs 12.06±108.65) 72 hours after NAC therapy compared with control. NAC improved the LVMPI value compared to the control group. Tei index examination using PWD (0.39±0.11 vs 0.49±0.08, p=0.005) and that using TDI (0.41±0.08 vs 0.57±0.08, p=0.001) showed improved values for NAC administration than those with controls.Conclusion: NAC 600 mg orally 3 times a day for 3 consecutive days can reduce MPO levels and improve diastolic function by decreasing LVMPI values.