#1
Which ECG waveform represents ventricular depolarization?
QRS complex
ExplanationVentricular depolarization occurs during the QRS complex.
#2
What does a prolonged PR interval on an ECG indicate?
Atrioventricular block
ExplanationProlonged PR interval suggests atrioventricular block.
#3
Which segment of the ECG corresponds to the time during which both ventricles are depolarized?
QRS complex
ExplanationBoth ventricles are depolarized during the QRS complex.
#4
Which segment of the ECG represents the time from the end of ventricular depolarization to the beginning of repolarization?
ST segment
ExplanationST segment represents end of ventricular depolarization to beginning of repolarization.
#5
What is the typical duration of a normal PR interval on an ECG?
0.12 to 0.20 seconds
ExplanationNormal PR interval duration ranges from 0.12 to 0.20 seconds.
#6
Which of the following is NOT a typical characteristic of a wide QRS complex on an ECG?
Sinus rhythm
ExplanationWide QRS complex does not indicate sinus rhythm.
#7
In a patient with an ST elevation on an ECG, which of the following conditions is most likely?
Pericarditis
ExplanationST elevation often indicates pericarditis.
#8
Which lead is commonly used to diagnose inferior myocardial infarction on an ECG?
Lead III
ExplanationLead III helps diagnose inferior myocardial infarction.
#9
What does the term 'sawtooth pattern' typically refer to in an ECG?
Atrial flutter
ExplanationSawtooth pattern often indicates atrial flutter.
#10
Which ECG lead is typically used to detect myocardial infarction involving the lateral wall of the left ventricle?
Lead aVL
ExplanationLead aVL helps detect lateral wall myocardial infarction.
#11
Which of the following is NOT a common cause of ST segment elevation on an ECG?
Pulmonary embolism
ExplanationPulmonary embolism is not a common cause of ST segment elevation.
#12
What does the presence of pathological Q waves on an ECG suggest?
Previous myocardial infarction
ExplanationPathological Q waves indicate previous myocardial infarction.
#13
Which electrolyte imbalance is most commonly associated with a prolonged QT interval on an ECG?
Hypomagnesemia
ExplanationProlonged QT interval is associated with hypomagnesemia.
#14
What is the most common cause of peaked T waves on an ECG?
Hyperkalemia
ExplanationPeaked T waves often indicate hyperkalemia.
#15
What does the 'delta wave' indicate on an ECG?
Wolff-Parkinson-White syndrome
ExplanationDelta wave suggests Wolff-Parkinson-White syndrome.
#16
Which type of cardiac block is characterized by progressive prolongation of the PR interval until a P wave is not conducted?
Second-degree AV block, Type I (Wenckebach)
ExplanationSecond-degree AV block Type I is characterized by progressive PR prolongation.
#17
What is the hallmark characteristic of torsades de pointes on an ECG?
Polymorphic ventricular tachycardia
ExplanationTorsades de pointes is characterized by polymorphic ventricular tachycardia.