#1
Which of the following represents the depolarization of the atria?
P wave
ExplanationThe P wave represents atrial depolarization in an ECG.
#2
Which component of the ECG represents ventricular depolarization?
QRS complex
ExplanationThe QRS complex indicates ventricular depolarization.
#3
Which of the following is NOT a common cause of artifact in an ECG recording?
Equipment malfunction
ExplanationEquipment malfunction is not a common cause of artifact.
#4
What is the typical duration of the QRS complex in a normal ECG?
0.04 to 0.10 seconds
ExplanationThe QRS complex typically lasts 0.04 to 0.10 seconds.
#5
Which of the following is a common characteristic of a normal sinus rhythm?
Regular rhythm
ExplanationA normal sinus rhythm is characterized by a regular rhythm.
#6
In a normal ECG, what does the T wave represent?
Ventricular repolarization
ExplanationThe T wave represents ventricular repolarization.
#7
Which of the following leads is often referred to as the 'infarction lead'?
Lead aVR
ExplanationLead aVR is often associated with infarctions.
#8
What does an elevated ST segment on an ECG indicate?
Myocardial infarction
ExplanationAn elevated ST segment is a sign of myocardial infarction.
#9
Which lead is commonly used to assess for right ventricular infarction?
Lead V4R
ExplanationLead V4R is used to assess right ventricular infarction.
#10
What does a prolonged PR interval on an ECG suggest?
Atrioventricular block
ExplanationA prolonged PR interval suggests atrioventricular block.
#11
In a 12-lead ECG, which leads provide information about the lateral wall of the left ventricle?
Lead V5, V6
ExplanationLeads V5 and V6 provide information about the lateral wall.
#12
What does an absence of QRS complexes on an ECG indicate?
Asystole
ExplanationAn absence of QRS complexes indicates asystole.