title: Idiopathic hypertrophic subaortic stenosis and heart block. Cycle-to-cycle variation as a function of alterations in preload and afterload.
mesh_terms: D001021:Aortic Valve; D001794:Blood Pressure; D006328:Cardiac Catheterization; D002306:Cardiac Volume; D002312:Cardiomyopathy, Hypertrophic / Q000150:complications*; D004562:Electrocardiography; D006327:Heart Block / Q000150:complications*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial; D013997:Time Factors