How your heart works: two pumps, one spark, and what a heart attack really is
How an ECG reads the electricity of your heart
A few sticky pads on your skin, and a machine draws your heartbeat as bumps and spikes. What is it reading, and why is there a pause inside every beat?
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At the same check-up, the doctor sticks small pads on the chest of Miva's uncle. Wires join them to a screen, and a line of bumps and spikes runs across it.
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The same shape comes back at every beat: a small bump, a tall sharp spike, a round bump. Each part matches one moment inside the heart.
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