ecg

Question 1

What is a prolonged PR interval?

Answer 1

A longer than normal time between the start of atrial depolarization and the start of ventricular depolarization

Question 2

List three causes of a prolonged PR interval

Answer 2

• Idiopathic
• Ischaemic heart disease
• Digoxin toxicity

Question 3

Which electrolyte imbalance is commonly associated with a prolonged PR interval?

Answer 3

Hypokalaemia

Question 4

Name a condition that can cause a prolonged PR interval due to infection.

Answer 4

Rheumatic fever

Question 5

What heart condition can lead to a prolonged PR interval due to endocarditis?

Answer 5

Aortic root pathology e.g. abscess

Question 6

True or False: Lyme disease can cause a prolonged PR interval.

Answer 6

True

Question 7

What rare condition is associated with a short PR interval?

Answer 7

Wolff-Parkinson-White syndrome

Question 8

List two additional conditions that may cause a prolonged PR interval.

Answer 8

• Sarcoidosis
• Myotonic dystrophy

Question 9

Fill in the blank: Hyperkalaemia can rarely cause a prolonged PR interval, but this is a much less common association than _______.

Answer 9

hypokalaemia

Question 10

Can athletes have a prolonged PR interval?

Answer 10

Yes