E. (1) sea shell fossils (2) it is made of old ocean floor that got uplifted during collision. 4. At convergent plate boundaries, the volcanic mountain chains that form are called (1) ________ in an ocean-. ocean setting and (2) __________ in an ocean-continent setting.
Poor R wave progression is a vague term used to describe the transition in voltage in the precordial leads of an electrocardiogram (ECG). It is not a diagnosis but simply describes a pattern frequently noted. In a normal individual there is a progressive increase in the magnitude of the voltage in the leads from V1 to V4.
True posterior MI. ECG changes are seen in anterior precordial leads V1-3, but are the mirror image of an anteroseptal MI: 1  Increased R wave amplitude and duration (i.e., a pathologic R wave is a mirror image of a pathologic Q). 2  Hyperacute ST-T wave changes: i.e., ST depression and large, inverted T waves in V1-3.