Browse the corpus
Walk the Even Hospital Database by book and chapter — the raw source passages that ground Ask, DDx, and the rest.
1 passage
©2013 UpToDate ® Print Email Atrial fibrillation Lead V1 showing coarse atrial fibrillation with moderate ventricular response. The two characteristic findings in AF are present: the very rapid atrial fibrillatory waves (f waves) which are variable in appearance; and the irregularly irregular ventricular response as the R-R interval between beats is unpredictable. Coarse atrial fibrillation may appear similar to atrial flutter. However, the variable height and duration of the f waves differentiate them from atrial flutter (F) waves which are identical in appearance and occur at a constant rate of about 250 to 350 beats/min. Courtesy of Ary Goldberger, MD.