Bare-metal stent is a stent without a coating or covering (as used in covered stents drug-eluting stents). It is a mesh-like tube of thin wire. The first stents licensed for use in cardiac arteries were bare metal – often 316L stainless steel

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Atrial fibrillation (AF or A-fib) is an abnormal heart rhythm (arrhythmia) characterized by rapid and irregular beating of the atrial chambers of the heart. It often begins as short periods of abnormal beating which become longer or continuous over time. It may also start as other forms of arrhythmia such as atrial flutter that then transform into AF

Chronic headache, or chronic daily headache (CDH), is classified as experiencing fifteen or more days with a headache per month. It is estimated that chronic headaches affect "4% to 5% of the general population". Chronic headaches consist of different sub-groups, primarily categorized as chronic tension-type headaches and chronic migraine headaches

mr Normand L. Widner

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