The correct diagnosis is sinus tachycardia, left atrial abnormality, and QRS (electrical) alternans, right axis caused by left posterior fascicular block (Figure 2). The rhythm is regular at a rate of ...
The initial part of the ECG shows a regular rhythm at a rate of 150 beats/min. The QRS complex duration is normal (0.08 sec) with a normal morphology. The axis is normal between 0° and +90° (positive ...
This ECG occurred in the setting of a large pericardial effusion causing cardiac tamponade. The pericardial effusion dampens the electrical signal on the ECG causing low voltage to be present (see Low ...
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