ECG Quiz: Can You Read Every Rhythm Strip?

1. A patient presents with a heart rate of 45 bpm and a regular rhythm with normal QRS duration. Which rhythm is most likely?

Atrial fibrillation

Sinus bradycardia

Second-degree AV block type II

Ventricular tachycardia

2. Which lead axis deviation is present when the QRS complex is predominantly negative in lead I and positive in lead aVF?

Left axis deviation

Right axis deviation

Extreme right axis deviation

Northwest axis

3. A widened QRS complex (>0.12 seconds) with a regular rhythm suggests which condition?

Supraventricular tachycardia

Ventricular tachycardia or bundle branch block

Atrial flutter

Sinus arrhythmia

4. Which ECG finding is characteristic of acute myocardial infarction in the anterior wall?

ST elevation in leads II, III, aVF

ST elevation in leads V1–V4

PR depression in multiple leads

Tall peaked T waves in precordial leads

5. A regular rhythm with a rate of 150 bpm and narrow QRS complexes is observed. What is the most likely diagnosis?

Sinus tachycardia

Atrial flutter with 2:1 conduction

Ventricular tachycardia

Atrial fibrillation

6. The QT interval on an ECG should be corrected for heart rate. Which formula is commonly used?

QTc = QT / √RR interval

QTc = QT + HR

QTc = QT − (0.04 × HR)

QTc = QT × HR / 60

7. A patient has an ECG showing prolonged PR interval (0.26 seconds) with occasional dropped beats. Which AV block is this?

First-degree AV block

Second-degree AV block type I (Wenckebach)

Second-degree AV block type II (Mobitz II)

Third-degree AV block

8. An ECG shows irregular rhythm, no visible P waves, and a ventricular rate of 80–100 bpm. What is the diagnosis?

Sinus arrhythmia

Atrial fibrillation

Premature atrial contractions

Atrial flutter

9. A patient with left ventricular hypertrophy typically shows which ECG finding?

Small QRS voltages in all leads

Increased QRS voltage in precordial leads with ST depression

Tall peaked P waves in lead II

Prolonged QT interval

Submit

12. What is the normal PR interval duration on an ECG?

0.08–0.12 seconds

0.12–0.20 seconds

0.20–0.28 seconds

0.28–0.36 seconds

13. ST segment elevation of 3 mm in leads V2–V3 with T-wave inversion suggests which condition?

Stable angina

Acute anterior MI

Pulmonary embolism

Left ventricular hypertrophy

Submit

ECG Quiz: Can You Read Every Rhythm Strip?

1. A patient presents with a heart rate of 45 bpm and a regular rhythm with normal QRS duration. Which rhythm is most likely?

2.

What first name or nickname would you like us to use?

2. Which lead axis deviation is present when the QRS complex is predominantly negative in lead I and positive in lead aVF?

3. A widened QRS complex (>0.12 seconds) with a regular rhythm suggests which condition?

4. Which ECG finding is characteristic of acute myocardial infarction in the anterior wall?

5. A regular rhythm with a rate of 150 bpm and narrow QRS complexes is observed. What is the most likely diagnosis?

6. The QT interval on an ECG should be corrected for heart rate. Which formula is commonly used?

7. A patient has an ECG showing prolonged PR interval (0.26 seconds) with occasional dropped beats. Which AV block is this?

8. An ECG shows irregular rhythm, no visible P waves, and a ventricular rate of 80–100 bpm. What is the diagnosis?

9. A patient with left ventricular hypertrophy typically shows which ECG finding?

10. In an ECG, the ______ interval represents the time from ventricular depolarization to repolarization.

11. A rhythm strip shows wide, irregular complexes with no organized atrial activity. This is consistent with ______.

12. What is the normal PR interval duration on an ECG?

13. ST segment elevation of 3 mm in leads V2–V3 with T-wave inversion suggests which condition?

14. The normal QRS duration in an ECG is less than ______ seconds.

15. ST segment elevation in leads II, III, and aVF indicates acute ______ wall myocardial infarction.