A Visual Guide to ECG Interpretation

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A VISUAL GUIDE TO ECG INTERPRETATION

ECG 9.2B A 54-year-old woman presents with dyspnea.

Electrical Alternans

The low voltage is most profound in the limb leads and right precordial leads. Subtle changes in QRS amplitude suggestive of pericardial effusion can be appreciated even in these low-voltage leads.

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ECG 9.2C Detail for variation in QRS amplitude.