#1
Which of the following components represents the electrical depolarization of the atria?
P wave
QRS complex
T wave
ST segment
#2
In a normal ECG, what does the QRS complex represent?
Atrial depolarization
Atrial repolarization
Ventricular depolarization
Ventricular repolarization
#3
What does the PR interval represent on an ECG?
Time taken for ventricular depolarization
Time taken for atrial depolarization
Time taken for ventricular repolarization
Time taken for atrioventricular conduction
#4
Which of the following leads typically reflects the electrical activity between the left arm and the left leg?
Lead I
Lead II
Lead III
Lead aVF
#5
What does the T wave represent on an ECG?
Atrial depolarization
Ventricular depolarization
Atrial repolarization
Ventricular repolarization
#6
Which lead placement provides a view of the heart's electrical activity from the frontal plane?
Lead I
Lead II
Lead III
Lead aVR
#7
What does a prolonged QT interval on an ECG indicate?
Atrial fibrillation
Ventricular fibrillation
Atrioventricular block
Risk of ventricular arrhythmias
#8
What would a widened QRS complex indicate on an ECG?
Atrial depolarization
Ventricular depolarization
Atrial repolarization
Ventricular repolarization
#9
What condition is associated with a 'sawtooth' pattern of atrial activity on an ECG?
Atrial fibrillation
Atrial flutter
Supraventricular tachycardia
Premature atrial contraction
#10
What is the normal duration of the PR interval on an ECG?
0.04 - 0.12 seconds
0.06 - 0.20 seconds
0.10 - 0.20 seconds
0.12 - 0.20 seconds
#11
Which of the following conditions would likely cause tall, peaked T waves on an ECG?
Hypokalemia
Hyperkalemia
Hypernatremia
Hypomagnesemia
#12
Which electrolyte imbalance is commonly associated with a prolonged QT interval?
Hypokalemia
Hypercalcemia
Hyperkalemia
Hypocalcemia
#13
What is the common cause of peaked T waves on an ECG?
Hyperkalemia
Hypokalemia
Hypercalcemia
Hypocalcemia
#14
Which of the following is an indication of atrial activity on an ECG?
P wave
QRS complex
T wave
ST segment
#15
Which electrolyte imbalance is commonly associated with a prolonged PR interval?
Hypokalemia
Hypercalcemia
Hyperkalemia
Hypomagnesemia