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Vestigial bands in the left ventricle

The Asia Pacific Heart Journal
Publication Date
DOI: 10.1016/s1328-0163(97)90006-3


Abstract Background: Echocardiography has rekindled interest in the nature of the left ventricular bands. Aims: Our intention was to document the incidence, course and size of the left ventricular bands in human hearts and to consider the reasons for the existence of the bands. Methods: One hundred normal human hearts were collected at random and analysed following autopsy. The left ventricles were opened, bisecting the mural leaflet and carrying the incision up to the apex without dividing any bands crossing the lumen. Results: Left ventricular bands were seen in 55 hearts. A single band was seen in 26 hearts, and multiple bands were seen in 29. When multiple, the bands varied from 2 to 6. Band length varied from 5 mm to 49 mm, and width from 0.5 nun to 5 mm. Forty-eight bands were tendinous and 60 muscular. One hundred bands originated from the septum of which 64 terminated in the anterior wall, 26 in the lateral wall, 2 in the papillary muscle, 6 in the apex and 2 in the septum. One band originated and terminated in the anterior wall, and 7 bands connected the anterior wall to the lateral wall. Conclusions: Left ventricular bands occur in normal hearts and vary widely in size, number and location, each heart being unique. They are phylogenic vestigial remnants of the pathway for the transmission of impulses from the left bundle of His across the lumen of the left ventricle, as seen prominently in bovine hearts.

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