#1
Which of the following represents the normal sinus rhythm in an ECG?
P wave before QRS complex
PR interval longer than 0.20 seconds
Regular R-R intervals
Absent T wave
#2
What does the QRS complex represent in an ECG?
Atrial depolarization
Atrial repolarization
Ventricular depolarization
Ventricular repolarization
#3
What is the term for an abnormally slow heart rate, typically below 60 beats per minute?
Tachycardia
Bradycardia
Arrhythmia
Fibrillation
#4
Which component of the ECG represents ventricular repolarization?
P wave
QRS complex
ST segment
T wave
#5
Which wave in an ECG represents ventricular repolarization?
P wave
QRS complex
ST segment
T wave
#6
What does the term 'QRS complex' represent in an ECG?
Atrial depolarization
Atrial repolarization
Ventricular depolarization
Ventricular repolarization
#7
Which electrolyte imbalance is commonly associated with a prolonged QT interval on an ECG?
Hyperkalemia
Hypokalemia
Hyponatremia
Hypercalcemia
#8
What does the T wave represent in an ECG?
Atrial depolarization
Atrial repolarization
Ventricular depolarization
Ventricular repolarization
#9
What is the typical duration of the PR interval in a normal ECG?
Less than 0.12 seconds
0.12 to 0.20 seconds
0.20 to 0.40 seconds
More than 0.40 seconds
#10
What does an inverted T wave in an ECG often indicate?
Myocardial infarction
Hyperkalemia
Hypokalemia
Ventricular depolarization
#11
Which ECG lead provides a view of the heart's electrical activity in the frontal plane and is often used to diagnose myocardial infarction?
Lead I
Lead II
Lead III
Lead aVL
#12
What does the term 'ST segment elevation' indicate in an ECG?
Atrial depolarization
Atrial repolarization
Ventricular depolarization
Myocardial injury
#13
Which lead placement is typically used to view the heart's electrical activity in the frontal plane in an ECG?
Lead I
Lead II
Lead III
Lead aVR
#14
Which wave in an ECG is typically absent in atrial fibrillation?
P wave
QRS complex
T wave
U wave
#15
Which condition is characterized by a widened QRS complex on an ECG?
Atrial fibrillation
Ventricular tachycardia
Sinus bradycardia
Supraventricular tachycardia
#16
What is the significance of an absent P wave on an ECG?
Atrial depolarization is delayed
Atrial repolarization is delayed
Ventricular depolarization is delayed
Ventricular repolarization is delayed
#17
Which condition is characterized by an irregularly irregular rhythm on an ECG?
Atrial fibrillation
Ventricular tachycardia
Sinus bradycardia
Supraventricular tachycardia
#18
What is the correct sequence of events in cardiac conduction as represented on an ECG?
P wave, QRS complex, T wave
QRS complex, P wave, T wave
P wave, T wave, QRS complex
P wave, PR interval, QRS complex