Which of the following is the diagrammatic representation of standard electrocardiogram (ECG) ?

Options

A.
B.
C.
D.

Answer

To determine which of the provided diagrams represents a standard electrocardiogram (ECG), we need to analyze the components of an ECG and identify the correct representation.

### Step-by-Step Solution:

1. **Understanding the Components of ECG**:
- An electrocardiogram consists of three main waves:
- **P wave**: Represents the depolarization of the atria (the upper chambers of the heart).
- **QRS complex**: Represents the depolarization of the ventricles (the lower chambers of the heart).
- **T wave**: Represents the repolarization of the ventricles.

2. **Analyzing the Diagrams**:
- We have four diagrams (A, B, C, D) to evaluate.
- Each diagram must accurately depict the sequence and shape of the P wave, QRS complex, and T wave.

3. **Evaluating Each Option**:
- **Option A**: Check if the P wave, QRS complex, and T wave are correctly placed and shaped. If the T wave is not represented correctly, this option is incorrect.
- **Option B**: Similar evaluation as Option A. If the shapes or sequence of the waves are not accurate, this option is incorrect.
- **Option C**: Again, check the representation. If the T wave is too far from the QRS complex or incorrectly shaped, this option is incorrect.
- **Option D**: This option should show the P wave, QRS complex, and T wave in the correct order and shape. If they are represented accurately, this option is likely correct.

4. **Conclusion**:
- After evaluating all options, if Option D accurately represents the P wave, QRS complex, and T wave as described, then Option D is the correct answer.

### Final Answer:
- The correct diagrammatic representation of the standard electrocardiogram (ECG) is **Option D**.