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Rarity of Atrial Tachycardia in Acute Myocardial Infarction and in Thyrotoxicosis

Arch Intern Med. 1966;118(1):41-42. doi:10.1001/archinte.1966.00290130043008.
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A GREAT variety of cardiac arrhythmias are observed during the acute stage of coronary thrombosis with myocardial infarction. Some are quite serious and others are less so. Paroxysmal ventricular tachycardia, paroxysmal atrial fibrillation, nodal rhythm, and complete heart block are particularly common complications of acute myocardial infarction. Similarly, paroxysmal atrial fibrillation or flutter are frequent features of thyrotoxicosis. It is odd, however, that classical paroxysmal atrial tachycardia, a common form of rapid heart action in healthy individuals and in patients suffering from valvular or other forms of heart disease, has appeared to be rare in both acute myocardial infarction and in thyrotoxicosis. The present study was undertaken to provide evidence for or against this simple, clinical impression.

Materials and Methods  The medical records of 400 unselected cases of definite acute myocardial infarction seen at the Peter Bent Brigham Hospital were reviewed. These included 208 consecutive cases reported in 19411


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