#1
Which of the following is not a component of an ECG?
Z-wave
ExplanationZ-wave is not a component of an ECG.
#2
What is the normal duration of the PR interval in an ECG?
0.06 - 0.12 seconds
ExplanationThe normal duration of the PR interval in an ECG is 0.06 - 0.12 seconds.
#3
What does the QRS complex represent in an ECG?
Ventricular depolarization
ExplanationThe QRS complex represents ventricular depolarization.
#4
What rhythm does a 'sawtooth' pattern in an ECG typically indicate?
Atrial fibrillation
ExplanationA 'sawtooth' pattern typically indicates atrial fibrillation.
#5
Which electrolyte imbalance may cause a prolonged QT interval in an ECG?
Hypomagnesemia
ExplanationHypomagnesemia may cause a prolonged QT interval in an ECG.
#6
What is the normal heart rate range for sinus rhythm in adults?
60 - 100 bpm
ExplanationThe normal heart rate range for sinus rhythm in adults is 60 - 100 bpm.
#7
Which lead in a 12-lead ECG is used to assess the anterior wall of the heart?
Lead V1
ExplanationLead V1 is used to assess the anterior wall of the heart.
#8
What does an elevated ST segment in an ECG usually suggest?
Myocardial infarction
ExplanationAn elevated ST segment usually suggests myocardial infarction.
#9
Which lead in a 12-lead ECG corresponds to the lateral wall of the heart?
Lead V6
ExplanationLead V6 corresponds to the lateral wall of the heart.
#10
Which ECG lead is often used to assess inferior myocardial infarction?
Lead III
ExplanationLead III is often used to assess inferior myocardial infarction.
#11
What does a 'cannon A-wave' indicate in an ECG?
Atrial contraction against a closed tricuspid valve
ExplanationA 'cannon A-wave' indicates atrial contraction against a closed tricuspid valve.
#12
What does the 'J-point' represent in an ECG tracing?
The point where the QRS complex meets the ST segment
ExplanationThe 'J-point' represents the point where the QRS complex meets the ST segment.