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ECG is a graphical representation of the...

ECG is a graphical representation of the electrical activity of the heart during a cardiac cycle. Identify the incorrect interpretation.

A

P-wave: Depolarisation of the atria.

B

QRS complex: Ventricular systole.

C

T-wave: Ventricular depolarisation.

D

End of T-wave: End of ventricular systole.

Text Solution

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The correct Answer is:
To solve the question regarding the incorrect interpretation of the ECG (electrocardiogram), we will analyze the components of the ECG and their meanings step by step. ### Step-by-Step Solution: 1. **Understanding the ECG Components**: - The ECG consists of several waves and complexes that represent different electrical activities of the heart during a cardiac cycle. The main components are: - **P Wave**: Represents atrial depolarization (the electrical activity that leads to the contraction of the atria). - **QRS Complex**: Represents ventricular depolarization (the electrical activity that leads to the contraction of the ventricles). - **T Wave**: Represents ventricular repolarization (the process of the ventricles returning to their resting state after contraction). 2. **Analyzing Each Statement**: - **Statement 1**: "P wave, depolarization of atria" - This statement is **true** as the P wave indeed represents atrial depolarization. - **Statement 2**: "QRS complex, ventricular systole" - This statement is also **true** because the QRS complex corresponds to the depolarization of the ventricles, which is followed by ventricular contraction (systole). - **Statement 3**: "T wave, ventricular depolarization" - This statement is **false**. The T wave actually represents ventricular repolarization, not depolarization. - **Statement 4**: "End of T wave, end of ventricular systole" - This statement is **true** because the end of the T wave indicates the end of the ventricular contraction (systole). 3. **Identifying the Incorrect Interpretation**: - From the analysis, the incorrect interpretation is found in Statement 3, which misrepresents the T wave as indicating ventricular depolarization instead of repolarization. ### Conclusion: The incorrect interpretation among the given statements is **Statement 3: "T wave, ventricular depolarization."** ---
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