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Basics of ECG Interpretation11 Topics
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Normal ECG Parameters
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ECG Interpretation of Chamber Enlargement4 Topics
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Dysrhythmias
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Bradycardia
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Heart Block3 Topics
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Sick Sinus Syndrome
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Tachycardia8 Topics
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Hyperkalemia
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Myocardial Hypoxia/Ischemia
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Low Amplitude QRS Complex
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Wide QRS Complex
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Bundle Branch Block
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Differentials for ECG Abnormalities
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ECG Findings:
- Variable amplitude and/or morphology of the P wave
- The change in P wave amplitude and/or morphology tends to gradually shift from normalcy
- It occurs in association with sinus arrhythmia
Etiology:
- Associated with increased vagal tone
- Due to shifting of the point of origin of depolarization within the complex sino-atrial node structure
- Usually a normal finding
Consequences:
- None
- In the face of a marked sinus arrhythmia, altered P wave morphology may be misinterpreted as atrial premature beats
Treatment: None required
