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Repeated USMLE Questions Step 1- Review- 36

Q- Which one of the following muscle relaxants causes muscle fasciculations prior to muscle relaxation when administered?

A-Atracurium

B-Rocuronium

C-Succinylcholine

D-Vecuronium

C-Succinylcholine- It is a neuromuscular blocker. It initially stimulates nicotinic acetylcholine receptors causing fasciculations then depolarization block follows.



Q- Which of the following is the most common site of aneurysm in the circle of Willis and may cause aphasia and hemiparesis?

A-Anterior communicating artery

B-Middle cerebral artery

C-Ophthalmic artery

D-Posterior communicating artery

A-Anterior communicating artery- 85% of saccular brain aneurysms arise from circle of Willis. The most common location is anterior communicating artery (35%), internal carotid artery (30%) and other listed arteries (22%).



Q- Diastolic heart sounds include the murmur of which one of the following cardiac abnormalities?

A-Aortic stenosis

B-Mitral stenosis

C-Mitral regurgitation

D-Pulmonic stenosis

B-Mitral stenosis- Diastolic heart sounds include murmurs of mitral stenosis, aortic regurgitation and pulmonic regurgitation while systolic heart sounds include murmurs of aortic stenosis, pulmonic stenosis and mitral regurgitation.



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