#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
What is the typical duration of the PR interval in a normal ECG?
0.12 to 0.20 seconds
ExplanationThe PR interval typically lasts 0.12 to 0.20 seconds.
#7
In a normal ECG, what does the T wave represent?
Ventricular repolarization
ExplanationThe T wave represents ventricular repolarization.
#8
Which of the following leads is often referred to as the 'infarction lead'?
Lead aVR
ExplanationLead aVR is often associated with infarctions.
#9
What does an elevated ST segment on an ECG indicate?
Myocardial infarction
ExplanationAn elevated ST segment is a sign of myocardial infarction.
#10
Which lead is commonly used to assess for right ventricular infarction?
Lead V4R
ExplanationLead V4R is used to assess right ventricular infarction.
#11
What does a prolonged PR interval on an ECG suggest?
Atrioventricular block
ExplanationA prolonged PR interval suggests atrioventricular block.
#12
What does a peaked T wave on an ECG often indicate?
Hyperkalemia
ExplanationA peaked T wave is often a sign of hyperkalemia.
#13
Which of the following arrhythmias is characterized by irregularly irregular rhythm with no discernible P waves?
Atrial fibrillation
ExplanationAtrial fibrillation is characterized by irregularly irregular rhythm without discernible P waves.
#14
Which of the following intervals represents the total time for ventricular depolarization and repolarization on an ECG?
QT interval
ExplanationThe QT interval represents the total time for ventricular depolarization and repolarization.
#15
Which of the following leads is best for detecting anterior wall myocardial infarction?
Lead V1
ExplanationLead V1 is best for detecting anterior wall myocardial infarction.
#16
Which of the following conditions is NOT typically associated with a prolonged QT interval?
Acute myocardial infarction
ExplanationAcute myocardial infarction is not typically associated with a prolonged QT interval.
#17
In a 12-lead ECG, which leads are considered to be bipolar limb leads?
Leads I, II, and III
ExplanationLeads I, II, and III are bipolar limb leads.
#18
What does a J point elevation on an ECG suggest?
Pericarditis
ExplanationA J point elevation suggests pericarditis.
#19
What is the normal axis range for the QRS complex in an ECG?
-30° to +90°
ExplanationThe normal axis range for the QRS complex is -30° to +90°.
#20
Which electrolyte imbalance is commonly associated with a prolonged QT interval on an ECG?
Hypokalemia
ExplanationHypokalemia is commonly associated with a prolonged QT interval.
#21
What is the significance of the PR interval in an ECG?
It measures the time from atrial depolarization to ventricular depolarization
ExplanationThe PR interval measures the time from atrial to ventricular depolarization.
#22
Which of the following conditions is characterized by a shortened QT interval on an ECG?
Hypercalcemia
ExplanationHypercalcemia is characterized by a shortened QT interval.
#23
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.
#24
What does an absence of QRS complexes on an ECG indicate?
Asystole
ExplanationAn absence of QRS complexes indicates asystole.