An Electrocardiogram (ECG) is a test that records the electrical activity of the heart. Here’s how you can draw and label a normal ECG:
Step 1: Draw the Baseline
Start by drawing a straight horizontal line. This represents the baseline or the isoelectric line, where there is no electrical activity.
Step 2: Draw the P Wave
Draw a small upward curve to the left of the baseline. This represents the P wave, which indicates atrial depolarization (the atria contracting).
Step 3: Draw the PR Segment
After the P wave, draw a short horizontal line. This is the PR segment, representing the time it takes for the electrical impulse to travel from the atria to the ventricles.
Step 4: Draw the QRS Complex
Next, draw a sharp downward deflection (Q wave), followed by a tall upward spike (R wave), and then a downward deflection (S wave). This is the QRS complex, representing ventricular depolarization (the ventricles contracting).
Step 5: Draw the ST Segment
After the QRS complex, draw a short horizontal line. This is the ST segment, representing the time between ventricular depolarization and repolarization.
Step 6: Draw the T Wave
Finally, draw a rounded upward curve. This is the T wave, representing ventricular repolarization (the ventricles relaxing).
Step 7: Label the ECG
Label each part of the ECG: P wave, PR segment, QRS complex, ST segment, and T wave. You can also add labels for the baseline and the intervals between the waves.
By following these steps, you can accurately draw and label a normal ECG. This will help you understand the electrical activity of the heart and identify any abnormalities.