Abstract:

Background: prolonged vasospasm of coronary arteries (CA) is quite often cause of myocardial infarction (MI) in young patients. As a rule, it is associated to drug-using, as an example, cocaine that among other things has systemic vasoconstrictive effect.

Material and methods: article describes the development of acute large myocardial infarction with ST elevation in a 50-year-old patient with no risk factors for cardiovascular complications (RF CVC), except for obesity 1 grade. Previously, she was observed with mild bronchial asthma and chronic allergic rhinitis, for which she used a nasal spray with xylometazoline at doses many times higher than the therapeutic ones for a long time. These conditions we consider to be a cause of her persistent coronary spasm, which led to acute coronary insufficiency and myocardial infarction.

Results: coronary angiography revealed multiple subtotal lesions in the basin of left coronary artery (LCA) and acute occlusion of right coronary artery (RCA), which was the source of MI. Patient underwent recanalization of occlusion and balloon angioplasty with partial restoration of blood flow. Intracoronary injection of isosorbide dinitrate led to recovery of arterial lumen in all segment except distal third where stenosis was ment to be atherosclerotic plaque and the the initial trigger of complete RCA obstruction. After stent implantation in the zone of stenosis and several intra-arterial injections of isosorbide dinitrate, RCA lumen was fully restored. During control angiography of left coronary artery basin, spasm was totally treated with full recovery of lumen of all previously defeated arteries.

During hospitalization period, pain did not recur; prolongedrelease oral nitrates (isosorbide mononitr 40 mg) were prescribed to prevent vasospasm. However, less than a 1,5 month, acute coronary syndrome recurred: the cause was a pronounced spasm of circumflex artery (Cx), that was treated by intracoronary injection of nitrates. Subsequently, therapy was changed: instead of nitrates, calcium channels blocking agents were recommended (CCB - felodipine 5 mg per day). During 9 months of observation, the pain did not recur.

Conclusion: this is the first case report of developed myocardial infarction due to an overdose of xylometazoline, described in the literature. It should be kept in mind, that in case of spastic lesions detected with coronary angiography, especially in young patients without risk factors for cardiovascular diseases, carefully obtaining of anamnesis  should be done, and nobody should neglect the intracoronary injection of low doses of nitrates even if blood pressure is low.

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