basic electrophysiology
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| show | corresponds with the onset of the QRS complex to approximately the peak of the T wave; cardiac cells cannot be stimulated to conduct an electrical impulse, no matter how strong the stimulus
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| Action potential | show 🗑
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| Altered automaticity | show 🗑
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| Amplitude | show 🗑
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| Arrhythmia | show 🗑
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| Artifact | show 🗑
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| show | the bundle of His
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| Atrioventricular node | show 🗑
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| show | leads aVR, aVL, and aVF; these leads record the difference in electrical potential at one location relative to the electrical potential of another extremity
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| Automaticity | show 🗑
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| AV bundle | show 🗑
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| show | specialized cells located in the lower portion of the right atrium; delays the electrical impulse in order to allow the atria to contract and complete filling of the ventricles
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| Axis | show 🗑
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| show | straight line recorded on ECG graph paper when no electrical activity is detected
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| Biphasic | show 🗑
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| Bipolar limb lead | show 🗑
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| Bundle of His | show 🗑
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| Complex | show 🗑
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| show | a system of pathways in the heart composed of specialized electrical (pacemaker) cells
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| Conductivity | show 🗑
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| Contractility | show 🗑
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| Depolarization | show 🗑
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| show | abnormal heart rhythm
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| Ectopic | show 🗑
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| show | period of the cardiac action potential that includes the absolute refractory period and the first half of eh relative refractory period
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| Electrode | show 🗑
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| show | elements or compounds that break into charged particles (ions) when melted or dissolved in water or another solvent
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| Enhanced automaticity | show 🗑
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| Excitability | show 🗑
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| show | third ECG electrode (the first and second are the positive and negative electrodes), which minimizes electrical activity from other sources
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| show | portion of the conduction system consisting of the bundle of His, bundle branches, and Purkinje fibers
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| show | ECG changes observed in leads that look directly at the affected area of the heart; indicative changes are significant when they are seen in two anatomically contiguous leads
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| Inherent | show 🗑
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| Interval | show 🗑
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| Intrinsic rate | show 🗑
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| show | electrically charged particle
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| Isoelectric line | show 🗑
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| show | point where the QRS complex and ST segment meet
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| show | electrical connection attached to the body to record electrical activity
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| Membrane potential | show 🗑
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| millivolt (mV) | show 🗑
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| show | working cells of the myocardium that contain contractile filaments and form the muscular layer of the trial walls and the thicker muscular layer of the ventricular walls
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| show | specialized cells of the heart's electrical conduction system, capable o spontaneously generating and conducting electrical impulsed
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| Permeability | show 🗑
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| Polarized state | show 🗑
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| show | P wave plus the PR segment; reflects depolarization of the right and left atria (P wave) and the spread of the impulse through the AV node, AV bundle, right and left bundle branches, and the Purkinje fibers (PR segment)
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| show | fibers found in both ventricles that conduct and electrical impulse through the heart
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| P wave | show 🗑
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| show | several waveforms that represent the spread of and electrical impulse though the ventricles (ventricle depolarization)
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| show | on an ECG, the first positive deflection in the QRS complex, representing ventricular depolarization; in pacing, R wave refers to the entire QRS complex, denoting and intrinsic ventricular event
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| Reciprocal change | show 🗑
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| Reentry | show 🗑
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| Refractoriness | show 🗑
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| Relative refractory period | show 🗑
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| show | movement of ions across a cell membrane in which the inside of the cell is restored to its negative state
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| show | line between waveforms; named by the waveform that precedes and follows it
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| show | normal pacemaker of the heart that normally discharges at a rhythmic rate of 60 to 100 bpm
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| ST segment | show 🗑
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| show | period during the cardiac cycle when weaker than normal stimulus can cause cardiac cells to depolarize; extends from the end of phase 3 to the beginning of phase 4 of the cardiac action potential
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| T wave | show 🗑
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| show | interval between two successive PQRST complexes during which electrical activity of the heart is absent; begins with the end of the T wave through the onset of the following P wave and represents the period from the end of ventricular repolarizton to the
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| Triggered activity | show 🗑
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| Unipolar | show 🗑
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| show | difference in electrical charge between two points
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| show | movement away from the baseline in either a positive or negative direction
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