In the QRS complex, what is the Q-wave?

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Study for the Cardiac HealthStream Telemetry Exam. Dive into detailed flashcards and multiple choice questions, each with helpful hints and explanations. Prepare thoroughly for your exam!

Multiple Choice

In the QRS complex, what is the Q-wave?

Explanation:
The Q wave is the first downward (negative) deflection seen in the QRS complex, reflecting initial septal depolarization from left to right as the ventricles begin to activate. This early, small negative spike is what defines the Q wave. That’s why the correct description is the first negative deflection. The R wave is the first positive deflection after the P wave, the S wave is the last negative deflection after the R wave, and a positive deflection after the R wave could be an R’ but it is not the Q wave.

The Q wave is the first downward (negative) deflection seen in the QRS complex, reflecting initial septal depolarization from left to right as the ventricles begin to activate. This early, small negative spike is what defines the Q wave.

That’s why the correct description is the first negative deflection. The R wave is the first positive deflection after the P wave, the S wave is the last negative deflection after the R wave, and a positive deflection after the R wave could be an R’ but it is not the Q wave.

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