Question:
Normal wave pattern of ECG wave form is shown in the figure below. Identify the missing wave from the wave form.
Normal wave pattern of ECG wave form is shown in the figure below. Identify the missing wave from the wave form.
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Remember: ECG sequence = P → QRS → T. P represents atrial depolarization and is the first wave.
Updated On: Sep 26, 2025
- R wave
- S wave
- Q wave
- P wave
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The Correct Option is D
Solution and Explanation
Step 1: Recall ECG components.
An ECG wave typically consists of the P wave, QRS complex, and T wave.
- P wave: Atrial depolarization.
- QRS complex: Ventricular depolarization (Q = initial downward deflection, R = tall upward deflection, S = downward deflection following R).
- T wave: Ventricular repolarization.
Step 2: Analyze the given ECG figure.
The figure shows a prominent upward spike (R wave), a downward deflection after it (S wave), and a rounded wave after that (T wave).
The initial small wave before QRS complex (P wave) is missing.
Step 3: Exclude wrong options.
- (A) R wave: Already visible in the figure.
- (B) S wave: Present after the R wave.
- (C) Q wave: Usually a small downward deflection before R, but here the P wave is entirely absent.
- (D) P wave: Missing wave; correct answer.
Step 4: Conclusion.
Thus, the missing wave in the ECG trace is the P wave.
An ECG wave typically consists of the P wave, QRS complex, and T wave.
- P wave: Atrial depolarization.
- QRS complex: Ventricular depolarization (Q = initial downward deflection, R = tall upward deflection, S = downward deflection following R).
- T wave: Ventricular repolarization.
Step 2: Analyze the given ECG figure.
The figure shows a prominent upward spike (R wave), a downward deflection after it (S wave), and a rounded wave after that (T wave).
The initial small wave before QRS complex (P wave) is missing.
Step 3: Exclude wrong options.
- (A) R wave: Already visible in the figure.
- (B) S wave: Present after the R wave.
- (C) Q wave: Usually a small downward deflection before R, but here the P wave is entirely absent.
- (D) P wave: Missing wave; correct answer.
Step 4: Conclusion.
Thus, the missing wave in the ECG trace is the P wave.
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