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A heartbeat begins when the organ’s pacemaker, a structure called the sinoatrial node, fires off an electrical impulse that disperses across the atria, the blood-collecting chambers.

TBX18 is normally active in embryos, where it triggers, among other things, the formation of the heart’s rhythm keeping centre, the sinoatrial node.

In healthy people, a small region of the heart, called the sinoatrial node, fires the electrical impulses that determine heart rate.

In 12 pigs, the team mimicked a fatal human heart condition in which electrical activity cannot spread through the heart from the sinoatrial node, forcing other, weaker parts of the heart to take over.

Instead, she went on about P waves and the sinoatrial node and what my mom’s EKG looked like, all at lightning speed.