The Conduction System of the Swine Heart

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The Conduction System of the Swine Heart Saroja Bharati, M.D., F.C.C.P., Marc Levine, M.D., Shoei K. Stephen Huang, M.D., Bruce Handler, M.D., Grant V.S. Barr, M.D., F.C.C.P., Robert Bauernfeind, M.D., Maurice Lev, M.D., F.C.C.P. CHEST Volume 100, Issue 1, Pages 207-212 (July 1991) DOI: 10.1378/chest.100.1.207 Copyright © 1991 The American College of Chest Physicians Terms and Conditions

Figure 1 His bundle recording of the pig. Intervals: HRA-LRA=10 ms; LRA-H = 65 ms; H-V = 25 ms. HRA = high right atrium; HBE = His bundle electrocardiogram; A = atrial wave; H = His bundle spike; V = ventricular wave; and LRA = low right atrium. CHEST 1991 100, 207-212DOI: (10.1378/chest.100.1.207) Copyright © 1991 The American College of Chest Physicians Terms and Conditions

Figure 2 Gross anatomy of the pig heart with diagrammatic outline of the course of the conduction system. (a, upper), Right atrial and right ventricular view. (b, lower), Left ventricular view. CS = coronary sinus; RA = right atrium; RV = right ventricle; N = AV node; BH = Bundle of His; RBB = right bundle branch; AO = aorta; LBB = left bundle branch; AR = anterior radiation; PR = posterior radiation; and LV = left ventricle. CHEST 1991 100, 207-212DOI: (10.1378/chest.100.1.207) Copyright © 1991 The American College of Chest Physicians Terms and Conditions

Figure 3 Sinoatrial (SA) node (Weigert-Van Gieson stain ×30). A = atrial muscle; Ne = nerve fiber on periphery of SA node. Arrows point to SA node. CHEST 1991 100, 207-212DOI: (10.1378/chest.100.1.207) Copyright © 1991 The American College of Chest Physicians Terms and Conditions

Figure 4 Approaches to the AV node and AV node (Weigert-Van Gieson stain ×45). Ap = approaches to the AV node; N = AV node. Arrows point to nerve fibers. CHEST 1991 100, 207-212DOI: (10.1378/chest.100.1.207) Copyright © 1991 The American College of Chest Physicians Terms and Conditions

Figure 5 Bundle of His. (a, left), Weigert-Van Gieson stain x 45. (b, right), Holmes silver stain x 150. C = central fibrous body; V = ventricular muscle; B = bundle. Arrows point to nerve fibers. CHEST 1991 100, 207-212DOI: (10.1378/chest.100.1.207) Copyright © 1991 The American College of Chest Physicians Terms and Conditions

Figure 6 (at left).Left bundle branch passing between conal and ventricular muscle (Gomori trichrome stain x 45). C = conal muscle; V = ventricular muscle. Arrows point to left bundle branch. CHEST 1991 100, 207-212DOI: (10.1378/chest.100.1.207) Copyright © 1991 The American College of Chest Physicians Terms and Conditions

Figure 7 (below). Right bundle branch. (a, left), Weigert-Van Gieson stain × 150. (b. right), Holmes silver stain ×450. V = ventricular muscle; RBB = right bundle branch. Arrows point to nerve fibers. CHEST 1991 100, 207-212DOI: (10.1378/chest.100.1.207) Copyright © 1991 The American College of Chest Physicians Terms and Conditions