Slide 3

What is the main purpose of electrocardiography (ECG)?

• To calculate R-R interval,QRS complex and ST segment

• To record the electrical currents during cardiac depolarization

• To visualize the heart's chambers

• To assess respiratory rate

In the cardiac cycle, what does the P wave represent?

• Ventricular depolarization

• Atrial depolarization

• Ventricular repolarization

• Atrial repolarization

What is the role of Einthoven's Triangle in electrocardiography?

• To amplify electrical signals

• To measure blood pressure

• To represent the arrangement of limb leads

• To detect arrhythmias

Which part of the ECG corresponds to ventricular depolarization?

• P wave

• QRS complex

• T wave

• S-T segment

What leads are used to view the right ventricle in the ECG?

• V1 and V2

• V4 and V5

• Lead I

• Lead III

How is heart rate calculated from the ECG?

• Counting the number of P waves

• Measuring the T wave amplitude

• Calculating the R-R interval

• Analyzing the S-T segment

What does an elevated T wave and prolonged ST segment on the ECG indicate?

• Hyperkalemia

• Hypocalcemia

• Hyponatremia

• Hypercalcemia

Which leads in the ECG represent augmented unipolar limb leads?

• Lead I

• Lead II

• aVR, aVL, and aVF

• V1 and V2

What is the average Mean Electrical Axis of the Heart in a normal condition?

• +30o

• +59o

• -20o

• +110o

What abnormality might be associated with an enlarged 'P' wave in the ECG?

• Bundle branch block

• Atrial hypertrophy

• Ventricular fibrillation

• SA node damage