ch 26 key terms.txt

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ch 26 key terms.txt
2011-09-20 09:34:01
26 key terms

ch 26 key terms.txt
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  1. 12-lead electrocardiogram (ECG)
    A standardized recording of the electrical activity of the heart and may be used to detect heart irregularities, lack of oxygen to parts of the heart, and enlargement of the chambers.
  2. arrhythmias
    Deviations from normal cardiac rhythm
  3. automaticity
    When a group of cardiac cells have the ability to generate an electrical impulse spontaneously.
  4. axis
    The imaginary line drawn between two electrodes
  5. conductivity
    The ability of the cardiac cells to transmit an impulse.
  6. contractility
    The capability of muscle fibers to shrink.
  7. defibrillation
    Delivering an electrical shock to the heart so that it completely depolarizes the cardiac cells in an effort to terminate ventricular fibrillation.
  8. depolarization
    Electrical changing in the interior of an excitable cell from negative to positive, which results in an action potential.
  9. dysrhythmia
    A disturbance in rhythm
  10. P wave
    Graphic representation of atrial depolarization
  11. PR interval
    An estimate of the amount of time it takes the impulse to travel from the SA node through the AV node, the bundle of His, and the main part of the left bundle branch.
  12. Purkinje fibers
    Conductive fibers that help to spread the electrical impulses of throughout the ventricular muscle They have an inherent rate of 15 to 40 beats per minute.
  13. QRS complex
    Graphic representation of ventricular depolarization.
  14. QT interval
    Graphic representation of the amount of time it takes for ventricular depolarization and repolarization.
  15. repolarization
    Electrical change in the interior of an excitable cell following depolarization in which the inside of the cell becomes more negatively charged
  16. SA node
    Primary pacemaker of the heart with an inherent rate of 60 to 100 beats per minute
  17. synchronized cardioversion
    Delivering an electrical shock to the heart that is synchronized to the patient's R wave.
  18. T wave
    Graphic representation of ventricular repolarization.

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