#1
What does the P wave represent in an electrocardiogram (ECG)?
Atrial depolarization
Ventricular depolarization
Atrial repolarization
Ventricular repolarization
#2
What does the QRS complex represent in an ECG?
Atrial depolarization
Ventricular depolarization
Atrial repolarization
Ventricular repolarization
#3
Which ECG lead is positioned at the right sternal border in the 4th intercostal space?
#4
Which ECG lead is commonly used to assess the lateral part of the heart?
Lead I
Lead II
Lead III
Lead aVL
#5
What does the term 'cardiac axis' refer to in the context of an ECG?
Orientation of the heart within the chest cavity
Direction of electrical conduction in the heart
Magnitude of the QRS complex
Duration of the PR interval
#6
Which ECG lead is commonly used for monitoring the heart's electrical activity?
Lead I
Lead II
Lead III
Lead aVR
#7
What is the normal duration of the PR interval in an ECG?
Less than 0.12 seconds
0.12 to 0.20 seconds
0.20 to 0.40 seconds
More than 0.40 seconds
#8
Which segment of the ECG represents the time when both ventricles are fully depolarized?
ST segment
T wave
QRS complex
PR interval
#9
What does the T wave represent in an ECG?
Atrial depolarization
Ventricular depolarization
Atrial repolarization
Ventricular repolarization
#10
What is the typical duration of the QT interval on an ECG?
Less than 0.12 seconds
0.12 to 0.20 seconds
0.20 to 0.40 seconds
More than 0.40 seconds
#11
Which condition is characterized by a prolonged QT interval on an ECG?
Atrial fibrillation
Supraventricular tachycardia
Long QT syndrome
Ventricular fibrillation
#12
In the limb lead system, which lead represents the electrical activity between the right arm and the left leg?
Lead I
Lead II
Lead III
Lead aVR
#13
Which lead in the precordial (chest) leads is commonly used to assess the anterior part of the heart?
#14
In the context of ECG, what does the term 'isoelectric' mean?
No electrical activity
Constant electrical activity
Irregular electrical activity
Rapid electrical activity
#15
What is the primary function of the SA (sinoatrial) node in the heart?
Conduction of electrical impulses to the ventricles
Initiation of the heartbeat
Conduction of electrical impulses to the atria
Regulation of blood flow