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24 Cards in this Set
- Front
- Back
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depolarization of atria
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P wave
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nodal delay
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PR segment
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time to ventricular activation
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PR interval
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depolarization of ventricles
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QRS
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depolarization of upper ventricular septum
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Q
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depolarization of bundle branches and ventricle muscle
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R
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depolarization of last portion of ventricles and septal tip
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S
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repolarization of ventricles
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T
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at iso-electric line; all ventricles depolarized
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ST segment
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point at which ST leaves QRS
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J point
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total time of systole
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QT interval
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supra-normal excitability
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U wave
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helpful in determining atrial enlargement
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P wave
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permits identification of ectopic foci and intra-atrial blocks
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P wave
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condition of atrium due to chronic lung disease
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P pulmonale
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condition of atrium due to mitral valve problems such as stenosis
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P mitrale
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can be displaced in atrial infarction, pericarditis, and inflammation
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PR segment
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used to measure AV nodal conduction; should be between 0.12 and 0.20 seconds
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PR segment
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can be prolonged in AV block, hyperthyroidism, and coronary heart disease
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PR interval
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important in identifying the heart's axis, hypertrophy, infarction, low and high voltage
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QRS
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used in the clinical assessment of malignant arrhythmia
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QT segment
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these points can be elevated during active infarction
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ST segment, J point
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these waves are tall in active infarction and inverted in ischemia
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T wave
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seen in hypokalemia and bradycardia
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U waves
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