Question:
In an ECG, an enlarged P-wave indicates:
In an ECG, an enlarged P-wave indicates:
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P-wave = Atrial depolarization. Enlarged P-wave usually points toward atrial enlargement.
Updated On: Jun 12, 2026
- Bradycardia
- Tachycardia
- Hypokalemia
- Enlarged atria
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The Correct Option is D
Solution and Explanation
Concept:
An Electrocardiogram (ECG) records the electrical activity of the heart. Different waves correspond to specific cardiac events.
Important ECG components include:
\[
P\text{-wave}
\]
which represents atrial depolarization,
\[
QRS\text{-complex}
\]
which represents ventricular depolarization,
and
\[
T\text{-wave}
\]
which represents ventricular repolarization.
Step 1: Recall the significance of the P-wave. The P-wave is produced when electrical impulses spread through the atria, causing them to contract. Therefore, the P-wave specifically reflects atrial activity.
Step 2: Understand what enlargement means. If the atria become enlarged, a greater mass of atrial muscle participates in depolarization. As a result, the P-wave becomes broader or taller than normal. This change is commonly observed in atrial enlargement.
Step 3: Examine other options. Bradycardia refers to a decreased heart rate. Tachycardia refers to an increased heart rate. Hypokalemia mainly affects ventricular repolarization and is associated with characteristic T-wave changes. None of these specifically produce an enlarged P-wave.
Step 4: State the conclusion. Hence, an enlarged P-wave indicates \[ \boxed{\text{Enlarged atria}} \]
Step 1: Recall the significance of the P-wave. The P-wave is produced when electrical impulses spread through the atria, causing them to contract. Therefore, the P-wave specifically reflects atrial activity.
Step 2: Understand what enlargement means. If the atria become enlarged, a greater mass of atrial muscle participates in depolarization. As a result, the P-wave becomes broader or taller than normal. This change is commonly observed in atrial enlargement.
Step 3: Examine other options. Bradycardia refers to a decreased heart rate. Tachycardia refers to an increased heart rate. Hypokalemia mainly affects ventricular repolarization and is associated with characteristic T-wave changes. None of these specifically produce an enlarged P-wave.
Step 4: State the conclusion. Hence, an enlarged P-wave indicates \[ \boxed{\text{Enlarged atria}} \]
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