This ECG was obtained from a man in his 70’s. We have no other clinical information. It is interesting for several reasons.
Giant T wave inversions The most obvious abnormalities we see on first inspection are the deeply inverted T waves in Leads V3 through V6. The T wave in V3 is biphasic. There are also T wave inversions in all of the limb leads except aVR. The precordial T wave inversions are called “giant T wave inversions” because they are 10 mm or more in depth. There are many causes of giant T wave inversions, including, but not limited to: myocardial ischemia, coronary artery disease and reperfusion, pulmonary edema, massive pulmonary embolism, subarachnoid hemorrhage, apical hypertrophy, post-tachycardia syndrome, and post-pacing syndrome.
What else? There are no Q waves or ST elevations. The ST segments are not entirely normal in shape, being flattened in most lead. The frontal plane axis is left. Even though the ECG almost meets criteria for left ventricular hypertrophy, by exclusion we would call this anterior fascicular block (left anterior hemiblock). Obviously, it would help greatly if we had some history and clinical information to accompany this ECG.
If the patient has complained of chest pain which has now resolved, we would be concerned about reperfusion T waves, or Wellen’s Syndrome. Usually, the T wave changes of Wellen’s Syndrome are prominent in V2 and V3, but we would consider the possibility of a not-so-correct electrode placement. The reperfusion T wave inversions of Wellen’s Syndrome are a dire warning: the left coronary artery has significant disease, and is intermittently occluding. Wellen's Syndrome means that acute anterior wall M.I. is threatening.
The rhythm is also interesting. From beat 4 until beat 10, the rhythm is fairly regular, but with slight variations in rate. Beats 7 and 11 may have slightly different P waves, but only to those who scrutinize very closely. Beats 1, 2, and 3 are irregular and have inverted P waves in the inferior leads, a sign that they are being conducted in a retrograde direction. The PR intervals seem to be shortening in beats 2 and 3, but there is not enough strip at that end to know for sure what is happening. Then, at the end of the strip, beat 12 arrives so early that we can’t evaluate the P wave, as it is buried in the T wave of beat 11.
For comparison There is another ECG with giant T wave inversion on our site that you might like to look at for comparison purposes. Dr. Ken Grauer also has a nice example, with thorough discussion, on his website. I will look forward to any comments from our experts and our readers.