Figure 2

Journal-Journal Inter-Citation Network of the Cardiac Literature in 2009. The network map was prepared as described for Figure 1. The clinical pole, along the bottom, dominates the figure, with distinct clusters: stroke and neurology on the left, cardiac surgery on the bottom, imaging on the bottom right, and then on the right the largest domain, focused on clinical cardiology, centered around the Journal of the American College of Cardiology, the American Journal of Cardiology, and the European Heart Journal. The basic research pole is confined to the upper left, anchored by Circulation Research and the American Journal of Physiology - Heart and Circulatory Physiology. Dense connections do exist between the clinical and basic science poles, but these are focused on journals on two topics: atherosclerosis (from Atherosclerosis to Arteriosclerosis Thrombosis and Vascular Biology) and hypertension (from American Journal of Hypertension to Hypertension and on into basic research in pharmacology).