As a domain expert in cardiology, I can provide you with an explanation of diffuse ST elevation and its significance in an electrocardiogram (ECG) reading. Diffuse ST elevation refers to a pattern on an ECG where there is a widespread increase in the ST segment across various leads of the heart. The ST segment represents the period between the end of the QRS complex, which signifies the ventricles depolarizing, and the beginning of the T wave, which signifies ventricular repolarization. Normally, the ST segment is relatively flat and isoelectric, meaning it is at the same voltage level as the baseline of the ECG. When we observe _diffuse ST elevation_ without reciprocal _ST depression_, it suggests a condition that affects the heart globally rather than a localized issue like a myocardial infarction (heart attack), which would typically present with ST elevation in certain leads and reciprocal ST depression in others. The pattern described, with ST elevation mostly in the inferior limb leads and lateral precordial leads, is highly suggestive of _pericarditis_, which is an inflammation of the pericardium, the sac-like membrane surrounding the heart. Pericarditis can cause a characteristic ECG pattern known as the "pericarditis ECG triad": 1. Diffuse ST elevation: This is seen in most leads, but it is important to note that it is not accompanied by ST depression in opposite leads, which would be expected in a myocardial infarction. 2. PR segment depression: This is a less specific but often accompanying finding in pericarditis. 3. T wave changes: These can evolve over time, starting as symmetrical and peaked, then flattening, and finally inverting as the condition progresses. It is crucial for healthcare professionals to recognize this pattern and consider pericarditis in the differential diagnosis, especially when other clinical signs and symptoms are present. read more >>

Here is the initial ECG: Diffuse ST elevation, without reciprocal ST depression, mostly in inferior limb leads and lateral precordial leads. This is very typical for pericarditis. Some ECG factors to consider in diagnosing pericarditis: 1.read more >>