#1
Which component of the ECG represents atrial depolarization?
P wave
ExplanationAtrial depolarization.
#2
What does the QRS complex represent in an ECG?
Ventricular depolarization
ExplanationDepolarization of the ventricles.
#3
Which component of the ECG represents ventricular repolarization?
T wave
ExplanationVentricular repolarization.
#4
Which lead is typically used for detecting myocardial infarction?
Lead V1
ExplanationDetection of myocardial infarction.
#5
What does a prolonged QT interval indicate?
Ventricular repolarization
ExplanationDelayed ventricular repolarization.
#6
What is the typical duration of the PR interval in a normal ECG?
0.12 to 0.20 seconds
ExplanationNormal PR interval duration.
#7
Which ECG lead is used to diagnose inferior wall myocardial infarction?
Lead III
ExplanationDiagnosis of inferior wall myocardial infarction.
#8
What does an inverted T wave indicate in an ECG?
Myocardial infarction
ExplanationIndication of myocardial infarction.
#9
Which of the following is a correct representation of normal sinus rhythm on an ECG?
Regular P-P intervals, normal QRS complex, upright T wave
ExplanationNormal sinus rhythm.
#10
Which vector represents the direction of ventricular depolarization during the QRS complex?
Vector sum of QRS complex
ExplanationDirection of ventricular depolarization.
#11
What does a 'sawtooth' pattern in an ECG indicate?
Atrial flutter
ExplanationPresence of atrial flutter.
#12
What does ST elevation in leads V1-V4 suggest on an ECG?
Myocardial infarction involving the anterior wall
ExplanationAnterior wall myocardial infarction.
#13
In which leads of an ECG is the P wave typically negative?
Lead aVR, aVL, aVF
ExplanationNegative P wave leads.
#14
What does a PR interval longer than 0.20 seconds suggest on an ECG?
First-degree atrioventricular block
ExplanationFirst-degree AV block.
#15
What does the absence of P waves indicate on an ECG?
Ventricular fibrillation
ExplanationVentricular fibrillation.