Q- Lidocaine is an effective antiarrhythmic because of which of the following mechanisms?
A- It blocks alpha-receptors
B- It block beta-receptors
C- It prolongs QT interval
D- It prolongs PR interval
E- It suppresses excitability in ischemic areas of the heart
Q- Outpatient prophylaxis of superior ventricular tachycardia (SVT) is best accomplished by which of the following medications?
Q- Combination of levodopa and carbidopa is recommended. Which of the following explains the significance of this combination?
A- Carbidopa enhances the absorption of levodopa
B- Carbidopa enhances the entry of levodopa into brain
C- Carbidopa enhances the conversion of peripheral levodopa into dopamine
D- Unknown mechanism