Hypokalemia causes U waves in the ECG seen as a positive wave just after ... the classic finding is an S wave in lead I, Q wave in lead III and inverted T waves in lead III (S1Q3T3 pattern).

Doctors may decide to order an ECG when evaluating a person’s heart. This is a test that measures ... points on this graph represent different waves of electrical activity.

The S wave then becomes quite small in lead V6. Note that an old anterior myocardial infarction can cause poor R wave progression. In this setting, there is no R wave in the anterior precordial ...

uw.edu Cardiovascular-related sudden death is the leading cause of mortality ... present on an ECG. ECG interpretation in athletes requires careful analysis to properly distinguish physiological ...

Given the history and the presence of sinus tachycardia, the most likely cause for this is a large pericardial effusion or tamponade. Consistent with this diagnosis is P wave alternans ...