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Electrocardiography Fundamentals
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Electrocardiography Fundamentals

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Questions and Answers

What is required to record electrical potentials generated by the current?

  • Electrodes placed on the skin (correct)
  • A single cardiac muscle fiber
  • A microelectrode inserted into a ventricular muscle fiber
  • A high-speed recording meter

    • What is the ECG composed of?

  • Only repolarization waves
  • Both depolarization and repolarization waves (correct)
  • Only depolarization waves
  • Neither depolarization nor repolarization waves

    • What is indicated by the color red in Figure 11-2?

  • Complete depolarization
  • Complete polarization
  • Depolarization (correct)
  • Repolarization

    • What is the stage of the muscle fiber in Figure 11-2A?

    <p>Halfway depolarization</p> Signup and view all the answers

    When is no potential recorded in the ECG?

    <p>When the ventricular muscle is completely polarized or completely depolarized</p> Signup and view all the answers

    What is shown in Figure 11-3?

    <p>A monophasic action potential recorded from a microelectrode inserted into a ventricular muscle fiber</p> Signup and view all the answers

    What is the standard representation of 10 small line divisions upward or downward in an ECG?

    <p>1 millivolt</p> Signup and view all the answers

    How much time does each 25 millimeters in the horizontal direction represent in an ECG?

    <p>1 second</p> Signup and view all the answers

    What is the typical voltage range of the QRS complex in an ECG?

    <p>1.0 to 1.5 millivolts</p> Signup and view all the answers

    How is the heart rate determined from an ECG?

    <p>By dividing the time interval between two successive heartbeats</p> Signup and view all the answers

    What is the typical voltage range of the T wave in an ECG?

    <p>0.2 to 0.3 millivolts</p> Signup and view all the answers

    What is the typical speed at which an ECG is run?

    <p>25 millimeters per second</p> Signup and view all the answers

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