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2. ... the injection of a contrast medium (usually iodine compound) via a flexible tube
3. [Miniature transmitter used to monitor heartbeats]
4. The sound of the dog's heartbeats is picked up by a microphone stuck to his fur
5. The passage of the dye through the blood vessels is recorded by two small photo-electric cells
6. Congenital malformations of the heart originate in the embryo
7. Dr. [Zdenek] Rychter produces his own tools for his very delicate operations
8. ... studying blood circulation in the new-born
9. Stockholm's Karolinska hospital - this boy works a stationary bicycle while his heart is being tested for abnormalities
10. ... autopsy specimens of coronary arteries
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