Which of the following accurately describes the Q wave?
1. First negative deflection after the P wave
2. Rounded and upright and precedes the QRS complex
3. Negative deflection following the R wave
4. Rounded and upright and follows the QRS complex
First negative deflection after the P wave
Rationale: The Q wave is the first negative deflection following the P wave. The negative deflection following the R wave is the S wave. P waves are rounded and generally upright and precede the QRS, while T waves are generally rounded and upright and follow the QRS complex.
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