Atrial Fibrillation – Pathophysiology (5) 24/01/24

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1) How fast do the atria contract in AF?

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a. 150 to 200 beats per minute

b. 200 to 250 beats per minute

c. 250 to 300 beats per minute

d. 350-600 beats per minute

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2) Why is the pulse irregularly irregular in AF?

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a. SA node discharges at irregular rate

b. Ventricular focus discharges at irregular rate

c. Concealed conduction in AV node

d. The refractory period of AV node is short

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3) Which is not a clinical feature of AF?

1 point

a. Pulse deficit of more than 10/minute

b. Varying intensity of the first heart sound

c. Absent ‘a’ waves in the jugular venous pulse

d. Mild exercise decreases the irregularity

e. Enlarged left atrium

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4) AF may occur in

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a. Normal individuals

b. Patients with lung disease

c. Thyrotoxicosis

d. All

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5) What is the most common complication of AF?

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a. Left atrial thrombus

b. Hypotension

c. Pulmonary edema

d. Myocardial ischemia

e. Cardiac failure

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