#1
What does the P wave represent in an ECG?
Atrial depolarization
Ventricular depolarization
Atrial repolarization
Ventricular repolarization
#2
Which wave represents ventricular repolarization on an ECG?
P wave
QRS complex
T wave
U wave
#3
What does the term 'isoelectric line' refer to in an ECG?
Baseline representing zero voltage
Line connecting the P and T waves
Segment between the QRS complex and the ST segment
Segment between the T wave and the U wave
#4
Which ECG lead is positioned at the 4th intercostal space, right sternal border?
Lead V1
Lead V2
Lead V3
Lead V4
#5
What does the term 'atrial kick' refer to in relation to the cardiac cycle?
Atrial depolarization
Atrial repolarization
Atrial contraction at the end of diastole
Atrial relaxation during systole
#6
Which lead placement is commonly used to detect myocardial infarction?
Lead I
Lead II
Lead III
Lead V1
#7
What does a prolonged PR interval indicate?
First-degree heart block
Second-degree heart block
Atrial fibrillation
Ventricular fibrillation
#8
What does ST segment elevation typically indicate?
Myocardial infarction
Atrial fibrillation
Ventricular hypertrophy
Bundle branch block
#9
Which lead placement is used to assess the electrical activity of the inferior wall of the heart?
Lead I
Lead II
Lead III
Lead aVL
#10
Which ECG lead is positioned at the 5th intercostal space, midclavicular line?
Lead I
Lead II
Lead V1
Lead V4
#11
What does a 'sawtooth' pattern of atrial activity indicate on an ECG?
Atrial fibrillation
Atrial flutter
Supraventricular tachycardia
Sinus bradycardia
#12
Which of the following is NOT a criterion for left ventricular hypertrophy on ECG?
Increased R wave voltage in V5-V6
Increased S wave depth in V1-V3
Prolonged PR interval
Increased R wave voltage in aVL
#13
What is the normal duration of the QRS complex in milliseconds?
Less than 0.06s
0.06s - 0.10s
0.10s - 0.20s
Greater than 0.20s
#14
What is the normal duration of the QT interval when corrected for heart rate?
Less than 0.30s
0.30s - 0.40s
0.40s - 0.50s
Greater than 0.50s
#15
Which electrolyte imbalance may cause a characteristic 'U wave' on an ECG?
Hyperkalemia
Hyponatremia
Hypokalemia
Hypercalcemia
#16
Which cardiac chamber is primarily responsible for generating the P wave on an ECG?
Right atrium
Left atrium
Right ventricle
Left ventricle
#17
What is the typical range of heart rate in sinus bradycardia?
Less than 60 beats per minute
60-100 beats per minute
100-150 beats per minute
Greater than 150 beats per minute