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Arrhythmia Recognition Webcast Series
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Practice ECG 9
This patient has a long first-degree heart block. The PR interval is almost 0.40 seconds. In this ECG, it is easy to pick up, but if the patient were tachycardic, the P wave could be buried in the previous complex; this could confuse the interpretation greatly. In that case, it would be very helpful to have an old ECG to compare the complexes.
Is this an example of low voltage? Actually it is not, because the QRS complex in II is 6 mm high. In order to meet low voltage criteria, all of the limb leads must be less than 5 mm.
There are nonspecific ST-T wave abnormalities here. There is also a small IVCD in III, and some notching of the lateral precordial leads.
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