Question

What type of deflection in the ECG trace does a wave of repolarization traveling toward a lead result in?

Option 1:
A. Positive deflection (upward).

Option 2:
B. Negative deflection (downward).

Option 3:
C. Biphasic deflection.

Option 4:
D. No deflection.

Answer 1

A wave of repolarization traveling toward a lead in an ECG results in a positive deflection. This concept is illustrated by the T wave in an ECG, representing ventricular repolarization, which shows positive deflection when the vector points toward the recording lead.

Step-by-step explanation:

A wave of repolarization traveling toward a lead in an electrocardiogram (ECG) trace usually results in a positive deflection (upward). This is the opposite of depolarization waves, which when moving towards a lead cause a negative deflection (downward) on the ECG trace. To understand this concept, it's helpful to consider some key points in the ECG such as atrial depolarization represented by the P wave, ventricular depolarization represented by the QRS complex, and ventricular repolarization represented by the T wave. Atrial repolarization is not seen, as it is masked by the QRS complex. When a vector is pointing towards a lead during repolarization, it will create an upward or positive deflection in the ECG trace represented by the T wave.