ECG Interpretation

What is the normal duration of the PR interval on an ECG?

• 0.15 to 0.25 seconds

• 0.05 to 0.10 seconds

• 0.12 to 0.20 seconds

• 0.25 to 0.30 seconds

What does a prolonged QT interval indicate on an ECG?

• Normal heart function

• Improved lung capacity

• Delay in the heart's electrical system

• Increased blood pressure

How is heart rate calculated on an ECG?

• By measuring the P wave amplitude

• By analyzing the T wave frequency

• By counting the number of Q waves within a specific time frame

• By counting the number of R waves within a specific time frame, usually one minute.

What ECG finding is characteristic of atrial fibrillation?

• ST segment elevation

• Regularly regular rhythm

• Irregularly irregular rhythm

• Prolonged QT interval

Where is the V1 lead typically placed on the body for ECG recording?

• Third intercostal space just to the left of the sternum

• Fifth intercostal space just to the left of the sternum

• Second intercostal space just to the right of the sternum

• Fourth intercostal space just to the right of the sternum

What pattern on an ECG suggests a myocardial infarction?

• QRS complex widening

• P-wave amplitude

• ST-segment elevation

• T-wave inversion

Describe the ECG changes seen in ventricular fibrillation.

• Chaotic, irregular electrical activity in the ventricles

• Absence of electrical activity in the ventricles

• Regular, organized electrical activity in the ventricles

• Intermittent electrical activity in the ventricles

How is sinus bradycardia identified on an ECG?

• Irregular rhythm with heart rate >100 bpm, inverted P waves, 2:1 P wave to QRS ratio

• Regular rhythm with heart rate >100 bpm, absent P waves, 1:2 P wave to QRS ratio

• Regular rhythm with heart rate <60 bpm, normal P-wave morphology, 1:1 P wave to QRS ratio

• Regular rhythm with heart rate <60 bpm, wide QRS complexes, 1:1 P wave to QRS ratio

What is the significance of ST-segment elevation in myocardial infarction?

• ST-segment elevation indicates a low risk of myocardial infarction

• ST-segment elevation suggests a non-cardiac cause

• ST-segment elevation in myocardial infarction signifies acute myocardial injury and is a key diagnostic criterion for STEMI.

• ST-segment elevation is not relevant in myocardial infarction diagnosis

A client is presenting with an ECG rhythm showing multiple non conducted P waves but for every conducted P the P-R interval is constant. What is this rhythm?

• first degree AV block

• Second degree AV block type I

• Second degree AV Block type 2

• Third degree AV block