Question

A QRS complex normally follows each P wave. One or even two of the three waveforms that make up the QRS complex may not always be present. The QRS complex begins as a downward deflection, the Q wave. A Q wave is always a negative waveform. The Q wave begins when the ECG leaves the isoelectric line in a downward direction and continues until it returns to the isoelectric line. The Q wave represents ________ of the ___________, which is activated from left to right. In lead II, the direction of the current flow is almost perpendicular to it, and more current is moving away from the positive electrode than is moving toward it. In lead MCL1, depolarization of the interventricular septum will appear as a small, upright R wave. In this lead, this is the first deflection of a normal QRS complex. Fill in the blanks.

Answer 1

The Q wave represents the depolarization of the interventricular septum and is the first deflection of a normal QRS complex.

Step-by-step explanation:

The Q wave represents the depolarization of the interventricular septum, which is activated from left to right. In lead II, the direction of the current flow is almost perpendicular to it, and more current is moving away from the positive electrode than is moving toward it. In lead MCL1, depolarization of the interventricular septum will appear as a small, upright R wave. In this lead, this is the first deflection of a normal QRS complex.