ECG Interpretation Quiz

What must be recorded for every ECG performed?

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How do you calculate heart rate using a 6-second ECG rhythm strip?

• Count the number of R waves in 6 seconds and multiply by 10

• Count the number of P waves in 6 seconds and multiply by 10

• Count the number of QRS complexes in 6 seconds and multiply by 10

• Count the number of T waves in 6 seconds and multiply by 10

What is the normal heart rate range for a normal sinus rhythm?

• Less than 60 beats per minute

• 60 to 100 beats per minute

• More than 100 beats per minute

What are the characteristics of a normal P wave?

• Height < 2.5 mm in lead II

• Width < 0.11 s in lead II

• Height > 2.5 mm in lead II

• Width > 0.11 s in lead II

What is the normal PR interval range?

• 0.12 to 0.20 s

• 0.20 to 0.25 s

• Less than 0.12 s

• More than 0.25 s

What are the pathological findings associated with Q waves?

• More than 2 small boxes deep

• More than 25% height of R wave

• Normal Q wave

• Absent Q wave

What are the causes of ST segment elevation?

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What are the characteristics of a normal T wave?

• Less than 5 mm

• Tall T wave

• Inverted T wave

• Biphasic T wave

What are the causes of tall T waves?

• Hyperkalaemia

• Hyperacute myocardial infarction

• Left bundle branch block

• All of the above

What is meant by cardiac axis?

• Normal axis is at the location 11 o’clock - 5 o’clock.

• Right axis deviation occurs when the right ventricle is hypertrophied.

• Left axis deviation occurs when the left ventricle is hypertrophied.