Minocycline as heart conditioning agent in experimental type 2 diabetes mellitus - an antibacterial drug in heart protection.

Cardiovascular diseases, and among them certainly myocardial infarction, remain leading cause of death worldwide. Diabetes increases risk of occurrence as well as adverse outcome of myocardial infarction. Conditioning maneuvers are the most attractive method for alleviating both the consequences of ischemia and reperfusion. Minocycline is a tetracycline derivative which exerts antioxidant, anti-inflammatory, and anti-apoptotic effects. The aim of this study was to assess the protective ability of preconditioning and postconditioning of isolated hearts from healthy and rats with experimentally induced type 2 diabetes with minocycline on functional recovery and redox status after ischemia and reperfusion. The hearts from healthy and diabetic rats were excised and retrogradely perfused according to the Langendorff technique. Using sensor in the left ventricle, the cardiodynamic parameters were recorded and in the samples of the coronary venous effluent oxidative stress biomarkers were analyzed. Minocycline was injected directly into the coronary vessels, in preconditioning 5 min before global ischemia, and in postconditioning during the first 5 min of reperfusion. Results of this study clearly show beneficial effects of minocycline applied both before ischemia and in the first minutes of reperfusion fashion in both healthy and diabetic rat hearts. The most prominent protective effect regarding oxidative stress is related to the decreased production of superoxide anion radical due postconditioning with minocycline in diabetic hearts. Cardiodynamic parameters were significantly improved in minocycline conditioned groups. Superoxide anion radical stands out as the most susceptible to changes induced by minocycline.

Bilateral Coronary Artery - Pulmonary Artery Fistula with Recurrent Ventricular Tachycardia: Case Report.

INTRODUCTION: Bilateral coronary artery fistulae to pulmonary artery with ventricular tachycardia have not yet been described in the literature. CASE OUTLINE: A case of a 23-year-old male patient who was treated at our clinic for recurrent ventricular tachycardia is presented. The patient was born with six fingers on his left hand, which was surgically corrected in his early childhood. Perfusion scintigraphy demonstrated reversible ischemia at the irrigation zone of the right coronary artery. The coronary angiography revealed two coronary to pulmonary artery fistulae. The right coronary artery fistula drained through a tubular vessel formation into the pulmonary artery, but the left anterior descendent fistula drained via multiple thin tortuous vessels into the pulmonary artery. The right coronary artery fistula was ligated surgically. The control scintigraphy registered no perfusion defect subsequently, but during the procedure ventricular tachycardia occurred. An electrophysiology study followed, but ventricular tachycardia could not be provoked. Two months later ventricular tachycardia occurred again. Two subsequent electrophysiology studies showed no ventricular tachycardia.The patient was treated with an implantable cardioverter defibrillator.Ventricular tachycardia was terminated four times during the first year follow-up. CONCLUSION: The mechanism of the ventricular tachycardia was unclear.The electrophysiology study was not sufficiently reliable in the patient with recurrent ventricular tachycardia and bilateral coronary artery to pulmonary artery fistulae. The therapy of choice and the prevention of sudden death in this case was an implantable cardioverter defibrillator.