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Across 1. record of the electrical activity of the heart 4. increased pulse rate 5. smallest blood vessel 8. primary disease of the heart muscle 12. temporary deficiency of blood supply 13. a type of lipid 16. necrosis of a localized area of tissue from a lack of blood supply 18. high blood pressure 19. irregularity of the heartbeat 20. type of artery that supplies the heart 21. excision of the spleen 22. sudden blocking of a vessel by foreign matter brought by the circulating blood

Down 2. restoring the heart rhythm by using electrical shock 3. agents that reduce blood pressure 6. largest artery 7. sac that encloses the heart 9. inflammation of a vein 10. general term for cancer originating in the lymphatic system 11. tumor consisting principally of blood vessels 14. lining of the heart 15. pertaining to blood vessels 17. muscular middle layer of the heart