Recent evidence suggests that postischemic myocardial dysfunction ("stunning") may be mediated by oxygen free radicals. Various studies have reported the beneficial effects of antioxidants in ischemia-reperfusion injury. The aim of this study was to assess the effect of N-acetylcysteine (NAC) treatment on oxidative stress, infarct size, and left ventricular (LV) function, as adjunct therapy in myocardial infarction (MI). Patients with acute MI received either 15 g NAC infused over 24 h (n = 15) or no NAC (n = 15), combined with streptokinase. Peripheral venous blood was serially sampled to measure creatine kinase (CK)-MB levels. Plasma malondialdehyde (MDA) level was measured at admission and after 4 and 24 h. Echocardiography was performed within 3 days of MI and after 3 months. At admission, plasma MDA levels were not different between the groups. In the NAC-treated patients plasma MDA levels decreased, whereas in the nontreated NAC patients MDA levels increased at 4 and 24 h (P < 0.01 and P < 0.001, respectively). Left ventricular ejection fraction was higher (P < 0.05) and LV end-systolic and end-diastolic diameters were lower (P < 0.001 and P < 0.001) in patients receiving NAC on day 3. Left ventricular wall motion score index was significantly lower in patients treated with NAC on day 3 (P < 0.05). Left ventricular diastolic parameters were not different whether patients were treated with NAC or not. No difference in reduction of infarct size was detected between the groups according to CK-MB levels. It was thus demonstrated that administration of NAC in combination with streptokinase significantly diminished oxidative stress and improved LV function in patients with acute MI. These encouraging results would justify the performance of a larger controlled study.

SUMMARYCoronary artery anomalies are found in 0.6% to 1.5% of coronary angiograms. Angiographic recognition of these vessels is important because of their clinical significance and importance in patients undergoing coronary angioplasty or cardiac surgery.We reviewed the database of the Cardiac Catheterization Laboratory of Uludag Medical University in Bursa, Turkey. All patients who were subjected to coronary angiography from 1994 to 2001 were included.The study included 12,059 patients who underwent diagnostic coronary arteriography during the 8 year period. One hundred patients had primary congenital coronary anomalies. Ninty-five (95%) of the patients had anomalies of origin and distribution while five (5%) had coronary artery fistulae. The left main coronary artery (LMCA) was the most common anomalous vessel involved (forty-eight (48%) of the patients). An LMCA distribution anomaly was observed in these 48 patients. An anomalous right coronary artery (RCA) was the second most common anomaly, seen in twenty-two (22%) of the patients. An anomalous circumflex artery (Cx) was the third most common anomaly, seen in seventeen. Five patients had a coronary artery fistulae. The fistulae in our series were small without significant shunt circulation.Primary congenital coronary anomalies are isolated lesions and generally have no relation with other congenital heart diseases. They do not appear to be associated with an increased risk for development of coronary atherosclerosis. Angiographic recognition of these vessels is important because of their clinical significance and importance in patients undergoing coronary angioplasty or cardiac surgery. (Int Heart J 2005; 46: 97-103)

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While the evidence is not incontrovertible, the 3 s pause threshold does not adequately discriminate between potentially asymptomatic and symptomatic competitive athletes, and alone should not be used to exclude potential competitors.

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