3D X-Ray Reveals Fibers That Control Heart Rhythm

X-ray technique to identify tissue fibers in the heart

A 3D image of the heart, showing the fibers that control heart rhythm. Credit: University of Liverpool

A new technique developed by scientists at the University of Liverpool may help medical experts develop ways to reduce the risk of fibrillation by showing them a 3D image of the heart and the fibers that control heart rhythm.

The new 3D images could further understanding of how the body’s heartbeat can be disturbed, which may help medics develop ways to reduce the risk of fibrillation – a condition in which heart muscle contracts chaotically and fails to pump blood rhythmically around the body.

The heart needs to pump blood in a regular rhythm to maintain a steady circulation of blood to all parts of the body. It does this through the coordinated action of the muscle tissue, which pumps the blood, and the conducting tissue, which is necessary to distribute an electrical wave to trigger every heartbeat. Until now scientists have been unable to produce high-resolution 3D images of the conducting tissue to fully identify the network that controls heart rhythm.

The team at Liverpool used a micro CT scanner to image hearts that had been treated with iodine to highlight the different parts of the tissue. They found that the solution was absorbed less significantly by the conducting parts of the heart compared to the muscular parts of the organ, allowing scientists to clearly identify the areas that produce electrical activity on the resulting 3-D image.

Dr. Jonathan Jarvis, from the University’s Institute of Ageing and Chronic Disease, said: “These new anatomically-detailed images could improve the accuracy of future computer models of the heart and help us understand how normal and abnormal heart rhythms are generated. 3-D imaging will give us a more thorough knowledge of the cardiac conduction system, and the way it changes in heart disease.

“Computer models based on these high-fidelity images will help us to understand why the heart rhythm is vulnerable to changes in heart size, blood supply, or scarring after a heart attack. One of the major concerns for surgeons in repairing malformed hearts, for example, is to avoid damage to the tissue that distributes electrical waves. If they had access to 3-D images of the conducting tissues in malformed hearts, however, it could be possible to understand where the conducting tissue is likely to be before they operate.”

Reference: “Contrast Enhanced Micro-Computed Tomography Resolves the 3-Dimensional Morphology of the Cardiac Conduction System in Mammalian Hearts” by Robert S. Stephenson, Mark R. Boyett, George Hart, Theodora Nikolaidou, Xue Cai, Antonio F. Corno, Nelson Alphonso, Nathan Jeffery and Jonathan C. Jarvis, 11 April 2012, PLoS ONE.
DOI: 10.1371/journal.pone.0035299

The research, in collaboration with Alder Hey Children’s Hospital and the University of Manchester, is published in PLoS ONE.

1 Comment on "3D X-Ray Reveals Fibers That Control Heart Rhythm"

  1. RAYMOND MICHAEL SIMPSON | August 31, 2020 at 7:00 am | Reply

    Some molecular bonds are called wires in a frame; so if these wires become cut or severed, so as to form a gap in the electrical circuit of the heart, especially in the septum channelling electrical impulses from the AVnode to squeeze the left ventricle and thereby blocked, then potential action is programmed to relay voltaic action from the right ventricle or the right side puts in an extra squeeze to carry this burden until exhausted requiring an implant of a pacemaker?

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