Top 50+ Solved CNS Drugs MCQ Questions Answer

From 31 to 39 of 39

Q. The main side effect of benztropine is

a. Miosis

b. Confusion

c. Diarrhoea

d. GIT haemorrhage

e. Bronchorrhoea

  • b. Confusion

Q. Thiopentone

a. Is not lipid soluble

b. Can be used IM or IV to induce anaesthesia

c. Has good analgesic properties

d. Can cause convulsive movements

e. Anaesthetic action is terminated by redistribution from CNS to other highly vascularised tissues

  • e. Anaesthetic action is terminated by redistribution from CNS to other highly vascularised tissues

Q. Nitrous oxide

a. Can be used with O2 as a carrier gas for halothane

b. Has poor analgesic properties

c. Forms a vapour which is explosive

d. Sensitises the heart to the action of catecholamines

e. Is an effective agent for inducing anaesthesia

  • a. Can be used with O2 as a carrier gas for halothane

Q. Codeine

a. Is more potent than fentanyl

b. Frequently causes diarrhoea

c. Is used to treat nausea caused by morphine

d. Occurs in foxglove plants

e. Depresses the cough reflex

  • e. Depresses the cough reflex

Q. Regarding GABA: all the following are true EXCEPT

a. Receptor blockers have anticonvulsant activity

b. Is found in high concentrations in the basal ganglia

c. Concentrations in the basal ganglia are abnormally low in Huntington’s chorea

d. Metabolism is inhibited by sodium valproate

e. Receptors are sensitive to the activity of benzodiazepines

  • a. Receptor blockers have anticonvulsant activity

Q. Regarding local anaesthetics (LA)

a. Lignocaine is metabolised in the liver faster than any of the other amide LA

b. Allergies to amide Las are more common than with the ester Las

c. Prilocaine is the most cardiotoxic LA

d. Cocaine is an amide LA which is often used as a drug of abuse

e. The +1/2 of lignocaine may be increased 3-4 fold in a patient with severe liver disease

  • e. The +1/2 of lignocaine may be increased 3-4 fold in a patient with severe liver disease

Q. Regarding nondepolarising muscle relaxants

a. Jaw and eye muscles are paralysed before the limb and trunk muscles

b. Rocuronium is the most potent nondepolarising skeletal muscle relaxant

c. Atracurium is a steroid derivative

d. Vecuronium blocks cardiac muscarinic receptors, thus inducing moderate increase in heart rate

e. The nondepolarising agents produce a non-surmountable blockade

  • a. Jaw and eye muscles are paralysed before the limb and trunk muscles

Q. The skeletal muscle relaxant with the longest duration of action is

a. Suxamethonium

b. Mivacurium

c. Pancuronium

d. Rocuronium

e. Vecuronium

  • c. Pancuronium

Q. Which of the following DOES NOT increase the susceptibility of a nerve fibre to conduction blockade by a local anaesthetic

a. Small diameter

b. Myelination

c. Location in the periphery of a nerve

d. High firing rate

e. Short action potential duration

  • e. Short action potential duration
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