#1
Which of the following represents the normal sinus rhythm in an ECG?
Regular R-R intervals
ExplanationNormal sinus rhythm is characterized by regular R-R intervals.
#2
What does the QRS complex represent in an ECG?
Ventricular depolarization
ExplanationThe QRS complex represents the depolarization of the ventricles in an ECG.
#3
What is the term for an abnormally slow heart rate, typically below 60 beats per minute?
Bradycardia
ExplanationBradycardia is the term for an abnormally slow heart rate, typically below 60 beats per minute.
#4
Which component of the ECG represents ventricular repolarization?
T wave
ExplanationThe T wave represents ventricular repolarization in an ECG.
#5
Which wave in an ECG represents ventricular repolarization?
T wave
ExplanationThe T wave in an ECG represents ventricular repolarization.
#6
What does the term 'QRS complex' represent in an ECG?
Ventricular depolarization
ExplanationThe QRS complex in an ECG represents ventricular depolarization.
#7
Which electrolyte imbalance is commonly associated with a prolonged QT interval on an ECG?
Hypokalemia
ExplanationA prolonged QT interval is often associated with hypokalemia.
#8
What does the T wave represent in an ECG?
Ventricular repolarization
ExplanationThe T wave represents the repolarization of the ventricles in an ECG.
#9
What is the typical duration of the PR interval in a normal ECG?
0.12 to 0.20 seconds
ExplanationThe PR interval in a normal ECG typically lasts from 0.12 to 0.20 seconds.
#10
What does an inverted T wave in an ECG often indicate?
Myocardial infarction
ExplanationAn inverted T wave in an ECG is often indicative of myocardial infarction.
#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
ExplanationLead I provides a view of the heart's electrical activity in the frontal plane and is used to diagnose myocardial infarction.
#12
What does the term 'ST segment elevation' indicate in an ECG?
Myocardial injury
ExplanationST segment elevation in an ECG indicates 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
ExplanationLead I is used to view the heart's electrical activity in the frontal plane in an ECG.
#14
Which wave in an ECG is typically absent in atrial fibrillation?
P wave
ExplanationThe P wave is typically absent in atrial fibrillation on an ECG.
#15
Which condition is characterized by a widened QRS complex on an ECG?
Ventricular tachycardia
ExplanationVentricular tachycardia is characterized by a widened QRS complex on an ECG.
#16
What is the significance of an absent P wave on an ECG?
Atrial depolarization is delayed
ExplanationAn absent P wave on an ECG indicates delayed atrial depolarization.
#17
Which condition is characterized by an irregularly irregular rhythm on an ECG?
Atrial fibrillation
ExplanationAtrial fibrillation is characterized by an irregularly irregular rhythm on an ECG.
#18
What is the correct sequence of events in cardiac conduction as represented on an ECG?
P wave, QRS complex, T wave
ExplanationThe correct sequence of events in cardiac conduction on an ECG is P wave, QRS complex, T wave.