Abstract
Background
Evidence suggests that oxidative stress plays a principal role in myocardial damage following ischemia/reperfusion events. Recent studies have shown that the antioxidant properties of N-acetylcysteine (NAC) may have cardioprotective effects in high doses, but—to the best of our knowledge—few studies have assessed this.
Objectives
Our objective was to investigate the impact of high-dose NAC on ischemia/reperfusion injury.
Methods
We conducted a randomized double-blind placebo-controlled trial in which 100 consecutive patients with ST-elevation myocardial infarction undergoing percutaneous coronary intervention (PCI) were randomly assigned to the case group (high-dose NAC 100 mg/kg bolus followed by intracoronary NAC 480 mg during PCI then intravenous NAC 10 mg/kg for 12 h) or the control group (5% dextrose). We measured differences in peak creatine kinase-myocardial band (CK-MB) concentration, highly sensitive troponin T (hs-TnT), thrombolysis in myocardial infarction (TIMI) flow, myocardial blush grade (MBG), and corrected thrombolysis in myocardial infarction frame count (cTFC).
Results
The peak CK-MB level was comparable between the two groups (P = 0.327), but patients receiving high-dose NAC demonstrated a significantly larger reduction in hs-TnT (P = 0.02). In total, 94% of the NAC group achieved TIMI flow grade 3 versus 80% of the control group (P = 0.03). No significant differences were observed between the two groups in terms of changes in the cTFC and MBG.
Conclusions
In this study, NAC improved myocardial reperfusion markers and coronary blood flow, as revealed by differences in peak hs-TnT and TIMI flow grade 3 levels, respectively. Further studies with large samples are warranted to elucidate the role of NAC in this population.
ClinicalTrials.gov identifier: NCT01741207, and the Iranian Registry of Clinical Trials (IRCT; http://irct.ir) registration number: IRCT201301048698N8.
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Acknowledgements
The authors wish to acknowledge the considerable contribution made to this study by the staff of the Emergency Unit, Coronary Care Unit, Cardiac Catheterization Laboratory, and Laboratory of Tehran Heart Center.
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Funding
This study was supported by Tehran University of Medical Sciences.
Conflicts of interest
Younes Nozari, Azadeh Eshraghi, Azita Hajhossein Talasaz, Mostafa Bahremand, Jamshid Salamzadeh, Mojtaba Salarifar, Hamidreza Pourhosseini, Arash Jalali, and Seyedeh Hamideh Mortazavi declare that they have no potential conflicts of interest that might be relevant to this manuscript.
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Nozari, Y., Eshraghi, A., Talasaz, A.H. et al. Protection from Reperfusion Injury with Intracoronary N-Acetylcysteine in Patients with STEMI Undergoing Primary Percutaneous Coronary Intervention in a Cardiac Tertiary Center. Am J Cardiovasc Drugs 18, 213–221 (2018). https://doi.org/10.1007/s40256-017-0258-8
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DOI: https://doi.org/10.1007/s40256-017-0258-8