Standard 12 Lead ECG System

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Across
  1. 3. Represents time between ventricular depolarization and repolarization
  2. 10. Node that fires between 60-100 times/minute
  3. 11. How many limb electrodes are used
  4. 12. The QRS complex represents the ___________ depolarization
  5. 13. Period of time when cells are ready to respond to stimulus in normal fasion
  6. 14. Under ________ conditions, tracings have very predictable directions, durations, and amplitudes
  7. 17. _______ is plotted on the horizontal line of the ECG paper
  8. 18. Ability of heart cells to transmit electrical current from cell to cell throughout entire conductive system
  9. 19. Trigger for myocardial contraction
  10. 21. How many precordial (chest) leads
  11. 22. Represents ventricular repolarization, rest, and recovery
  12. 23. The number of small squares that equal 3 seconds
  13. 24. Graphic representation of electrical activity of heart’s conductive system recorded over period of time
  14. 25. _________ is plotted on the vertical line of the ECG paper
Down
  1. 1. Period of time when cells cannot respond to stimulus
  2. 2. The ________ square on the ECG paper is equal to 0.04 sec
  3. 4. _______ leads which have two electrodes one is negative and one is positive
  4. 5. Is usally flat and not seen
  5. 6. Potentials Heart contracts by generating and propagating _________
  6. 7. Ability of cardiac muscle fibers to shorten and contract in response to electrical stimulus
  7. 8. Normal cycle of electrical activity in heart begins with _______ depolarization
  8. 9. specialized pacemaker cells located in the SA node
  9. 15. Primary electrolytes responsible for electrical difference across the RMP include Sodium, calcium and ________
  10. 16. state When the heart is relaxed is said to me in a _______ state
  11. 20. The ________ square on the ECG paper is equal to 0.20 second
  12. 26. A standard 12 lead ECG has _______ electrodes