#1
Which component of the ECG waveform represents atrial depolarization?
P wave
ExplanationRepresents atrial depolarization.
#2
What is the typical heart rate range considered normal for adults at rest?
60-80 beats per minute
ExplanationNormal heart rate range for resting adults.
#3
What does the QRS complex represent in an ECG waveform?
Ventricular depolarization
ExplanationIndicates ventricular depolarization.
#4
In a normal ECG, what is the duration of a complete cardiac cycle (one heartbeat)?
0.2 seconds
ExplanationDuration of one heartbeat in a normal ECG.
#5
Which ECG lead is often used to assess the electrical activity of the inferior part of the heart?
Lead III
ExplanationLead commonly used for assessing inferior heart activity.
#6
Which part of the heart's conduction system is responsible for delaying the electrical impulse before it enters the ventricles?
AV node
ExplanationAV node delays impulse before entering ventricles.
#7
What does the term 'P-R interval' represent in an ECG waveform?
Delay between atrial and ventricular depolarization
ExplanationRepresents delay between atrial and ventricular depolarization.
#8
In lead aVR of an ECG, which part of the heart is primarily represented?
Anterior
ExplanationAnterior part of the heart primarily represented in lead aVR.
#9
Which ECG lead is positioned at the mid-clavicular line in the fifth intercostal space?
Lead V4
ExplanationLead positioned at mid-clavicular line, fifth intercostal space.
#10
Which lead is commonly used for monitoring cardiac activity during exercise stress testing?
Lead II
ExplanationCommon lead for monitoring cardiac activity during exercise.
#11
What does the term 'ST segment' represent in an ECG waveform?
Isoelectric period between ventricular depolarization and repolarization
ExplanationSegment between ventricular depolarization and repolarization.
#12
In an ECG, what does a prolonged QT interval indicate?
Increased risk of ventricular arrhythmias
ExplanationProlonged QT interval indicates higher ventricular arrhythmia risk.
#13
Which of the following conditions may result in a 'flatline' or isoelectric line on an ECG?
Ventricular fibrillation
ExplanationVentricular fibrillation may cause a 'flatline' on ECG.
#14
Which electrolyte imbalance is commonly associated with a prolonged QT interval on an ECG?
Hypokalemia
ExplanationProlonged QT interval often associated with hypokalemia.
#15
What is the primary function of the Q wave in an ECG waveform?
Reflects the initiation of the electrical impulse in the septum
ExplanationQ wave reflects initiation of septal electrical impulse.
#16
Which ECG lead is commonly used to monitor the electrical activity of the lateral part of the heart?
Lead aVL
ExplanationLead commonly used for monitoring lateral heart activity.