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.
1. Get help from a doctor now âº. ECG QRS: Q is a downward deflection on the ecg, r is an upward deflection and s a downward one. The trio, qrs, represents the electrical activity ov ventricular contraction on the electrocardiogram....Read more.he two events are seen on the ekg as the p and r waves. If that is shorter than 120 msec, that can mean an accessory pathway that is bypassing the normal conduction system and cause pre-excitation.