#1
What does an electrocardiogram (ECG or EKG) measure?
Heart rate
ExplanationMeasures heart rate through electrical activity.
#2
What is the standard paper speed used in most ECG recordings?
50 mm/s
ExplanationSpeed of ECG paper passing through.
#3
Which of the following leads in an ECG records the electrical activity of the heart in the horizontal plane?
Lead I
ExplanationMeasures electrical activity from right to left.
#4
Which of the following represents the P-wave in an ECG?
Downward deflection before the QRS complex
ExplanationFirst wave representing atrial depolarization.
#5
What is the typical duration of the QRS complex in a normal ECG?
Between 0.06 and 0.10 seconds
ExplanationTime taken for ventricular depolarization.
#6
Which lead configuration is commonly used in a standard 12-lead ECG?
Chest leads
ExplanationProvides anterior and lateral views.
#7
What does the T-wave represent in an ECG?
Ventricular repolarization
ExplanationCompletion of ventricular repolarization.
#8
Which ECG lead is typically used to diagnose myocardial infarction?
Lead V1
ExplanationRecords electrical activity over septal region.
#9
What does the ST segment represent in an ECG?
Ventricular repolarization
ExplanationPeriod of ventricular repolarization.
#10
What is the significance of the PR interval in an ECG?
Conduction time from atria to ventricles
ExplanationTime taken for atrial depolarization to ventricular depolarization.
#11
Which electrolyte imbalance can cause a characteristic 'U' wave in an ECG?
Hyperkalemia
ExplanationElevated potassium levels affecting repolarization.
#12
What is the term for an abnormal ECG rhythm characterized by chaotic, irregular atrial activity?
Atrial fibrillation
ExplanationIrregular atrial contractions.
#13
What does a 'bundle branch block' pattern indicate on an ECG?
Delayed conduction in the right or left bundle branches
ExplanationImpaired conduction in bundle branches.