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EKG

EKG. Electromagnetic Radiation. electromagnetic induction occurs without a wire for the current to travel through. Moving any charged object (like a balloon rubbed on your head) will create… A moving magnetic field which in turn will create… A moving electric field which causes…

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EKG

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  1. EKG

  2. Electromagnetic Radiation • electromagnetic induction occurs without a wire for the current to travel through. • Moving any charged object (like a balloon rubbed on your head) will create… • A moving magnetic field which in turn will create… • A moving electric field which causes… • This continuously repeats

  3. EM wave

  4. How fast do these waves go • Since the waves travel due to a constant electromagnetic induction they always travel at the same speed. • This speed is exceptionally fast, as a matter of fact it is the fastest anything can ever go • This speed is…. • 3.0 x 108 m/s in a vacuum.

  5. What is an EKG • Electrocardiogram ~it is also called an ECG (the name comes from the German Elektrokardiogramm) • - this is a graph produced by measuring the magnetic field produced by the electric current causing the contraction of the heart muscles.

  6. History • All muscles, including the heart, contract from electrical impulses. • The first to look at the heart from an electrical point-of-view was Augustus Waller. • Willem Einthoven contiuned this work and used the string galvanometer that he invented. • Einthoven assigned the letters P, Q, R, S and T to the various deflections on the graph. • He was awarded the 1924 Nobel Prize for Physiology or Medicine for his discovery.

  7. Einthoven’s EKG

  8. Einthoven’s Letters

  9. Normal EKG • A typical ECG tracing of a normal heartbeat consists of a P wave, a QRS complex and a T wave.

  10. Human Heart

  11. Human Heart

  12. P-Wave • The P wave is caused atrial contraction. • The relationship of the P Wave to QRS complex may indicate presence of a heart block. • Irregular or absent P waves could be arrhythmia.

  13. QRS complex • The QRS complex is caused by the contraction ventricles, which are much bigger the atria. • Therefore, this is much larger than the other waves.

  14. T-Wave • The T wave represents the repolarization of the ventricles muscles. This is the muscles getting ready to contract again. • The QRS complex hides the atrial repolarization.

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