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.
ECG Waveforms. Each portion of a heartbeat produces a different deflection on the ECG. These deflections are recorded as a series of positive and negative waves. On a normal ECG, there are typically up to five visible waveforms: 1  the P wave, 2  the Q wave, 3  the R wave, 4  the S wave, 5  and the T wave.