When determining the presence of left ventricular hypertrophy, you measure to the tip of the deepest QS complex in V1 or V2 and to the tip of the tallest R wave in V5 or V6. For both of these measurements, where should you start the measurement?
A)Base of the P wave
B)Level of the ST segment
C)Base of the Q wave
D)Isoelectric line

Question

Quizplus · Accepted Answer

The measurement for determining the presence of left ventricular hypertrophy should be taken from the isoelectric line, which is the baseline or flat line on an ECG tracing. This is because the height of the QRS complex is measured from the baseline, and both the deepest QS complex in V1 or V2 and the tallest R wave in V5 or V6 represent the tallest or deepest deviation from the baseline. Starting the measurement at any other point would not accurately reflect the height of the QRS complex or the presence of left ventricular hypertrophy.

When Determining the Presence of Left Ventricular Hypertrophy, You Measure