Correction for Racker and Kadish, Circulation 101 (9) 1049-1059.

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(Circulation. 2000;101:2991.)
© 2000 American Heart Association, Inc.

In the article by Racker and Kadish that appeared in a previous issue of the journal (Circulation 2000;101:1049–1059), Figures 2, 3, 6, and 9 did not reproduce well. Better quality images follow.

View larger version (161K): [in this window] [in a new window]   Figure 2. Direct 3-dimensional analysis of AV junction region in selected serial orthogonal sections. A and B, Vertical lines indicate section level in C. B, C1, Coronary sinus ostium (CSO) and black dot identify a regularly appearing sinus in lateral, inferoanterior lip of coronary sinus ostium. A, Parallel plane: the PAVB, AVN, and DAVB span AV junction region as a myocardial continuum confluent with right bundle-branch (RBB); medial atrionodal bundle (MAB) and lateral atrionodal bundle (LAB) are located on either side of coronary sinus (CS); and superior atrionodal bundle (SAB) is superior to AVN. Dashed lines, Koch’s triangle. B, Perpendicular plane: collagen encasement imparts a gray tone to PAVB, AVN, and DAVB in contrast to dark staining of medial atrial wall (MAW) and ventricular septum (VS) myocardium. White arrowheads delineate MAW annular, subepicardial circumferential lamina. Thin sleeve of central fibrous body connective tissue separates AVN from MAW. C, Transverse plane. C1, MAB and LAB converge. C2, Collagen septa separate vertical stack of PAVB fascicles atop VS. C3, Convergence of SAB and PAVB. C4, SAB is superior to AVN, which is surrounded by halo of central fibrous body connective tissue. Perpendicular lamina myofibers cascade over central fibrous body and descend into medial leaflet. C5, DAVB within central fibrous body and astride VS. Note specialized tissues are outside MAW. C1, CSFo and star indicate CS fossa; LA, left atrium; n, noncoronary posterior aortic valve sinus wall; TT, tendon of Todaro. Calibration bar in A and B, C1. (Goldner’s trichrome.)

View larger version (123K): [in this window] [in a new window]   Figure 3. A, Orthogonal parallel plane PAVB is a loose aggregate of linearly arrayed myocardium intermixed with fat vacuoles that condenses at PAVB-AVN junction (Junct) and is separated from MAW by a large blood vessel (white arrows). B, From box in A, myocytes with uniform cross-striations (black arrowheads) and unusual broad intercalated disks (open arrows) that display a central density (inset). C, Sheaves of nerve terminals (curved black arrows) impinge along lengths of myofibers. Myocytes contain evenly distributed cross-striations (black arrowheads). D, From box in A, parallel fine fascicles (Fasc) composed of strands of twisted myofibers (black and white arrowheads), many showing fine finger-like processes (inset). Sheaves of nerve endings (curved black arrows) contact fascicles and capillaries (top right). Collagen is interspersed between fascicles. Inset, Myocyte end processes are >30 µm long.

View larger version (128K): [in this window] [in a new window]   Figure 6. A, Orthogonal parallel plane AVN displays a tightly interwoven mass of myocardium, and its fascicles abruptly become parallel at AVN-DAVB junction. B, From A, myofibers and a sheaf of thin myocyte processes with uniform cross-striations (arrowheads) containing a stack of short intercalated disks (open arrows). Sheaves of nerve endings (curved black arrow) pass over myocyte thin processes. C, Fascicles display twisting myofibers and myocytes with perinuclear clear regions (arrows). D. From box in A, swirls of interweaving fascicles containing spiraling myofibers, thin myocyte processes (curved open arrows) are embedded in a rich capillary bed (short curved black arrows). Sheaves of nerve endings (curved black arrows) with varicosities (top left), boutons (see inset), or nerve tendrils (white arrows) terminate on myofibers. Intercalated disks are randomly dispersed (short open arrows). (Goldner’s trichrome.)

View larger version (120K): [in this window] [in a new window]   Figure 9. A, Orthogonal parallel plane DAVB displays large parallel fascicles separated by collagen lamina. B, From region in A, fascicle with twisting myofibers (arrowheads) contain myocytes with uniform cross-striations and clear cytoplasmic perinuclear zones (arrows). C, Intercalated disks (open arrow) are narrow. D, From A, large parallel fascicles with twisting myofibers, thin myofiber branches (arrowheads), intercalated disks (open arrows), and capillaries (small curved arrows). (Goldner’s trichrome.)

In addition, the final sentence of the Methods and Results section of the Abstract should read as follows: "Sheaves of nerve terminals are found, including boutons as in skeletal muscle."

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