Heart attack oxygen therapy. View of an elderly man holding an oxygen mask up to his face. He is suffering from breathlessness due to angina pectoris or a heart attack (myocardial infarction). The oxygen mask supplies him with air enriched with the oxygen he is lacking. Angina is a feeling of pain and constriction in the chest. It is caused by a blockage in one of the coronary arteries which supply the surface of the heart with oxygen. This can result in tissue death and a heart attack. Alternatively the man may be suffering from asthma or bronchitis which cause breathlessness due to inflammation of the lung's airways.
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