Pharmacology of the Cardiovascular and Central Nervous Systems

71.    Tachycardia due to digoxin intoxication can be treated by:

a.     phenytoin.

b.     propranolol.

c.     calcium. 

d.     procainamide.

72.    Verapamil:

a.     decreases myocardial contractility.

b.     enhances AV nodal conduction.

c.     shortens the refractory period of conducting tissue.

d.     increases the automaticity of the conducting system.

73.    Triamterene:

a.     is a potassium sparing diuretic.

b.     competitively inhibits the effect of aldosterone at the renal tubules.

c.     inhibits aldosterone secretion.

d.     enhances the diuretic action of chlorthiazide. 

74.   Methyldopa:

a.      is an adrenergic neuron blocker.

b.      can cause haemolytic anaemia.

c.      can cause drowsiness.

d.      can cause postural hypotension.

75.    Inhibition of angiotensin-converting enzyme:

a.      decreases the release of renin.

b.      lowers the blood pressure in essential hypertension.

c.      can produce loss of libido.

d.      can cause bradycardia.

76.    Intravenous thiopentone:

a.      decreases cerebral blood flow.

b.      causes respiratory depression.

c.      is used for the induction of surgical anaesthesia.

d.      has a short duration of action of a few minutes.

77.    The following general anaesthetics are avoided in electrocautery:

a.      cyclopropane.

b.      halothane.

c.      ether.

d.      nitrous oxide.

78.    The benzodiazepines possess the following properties:

a.      their anticonvulsant properties differ markedly.

b.      they do not cause REM sleep suppression.

c.      they can cause problems of drug dependence.

d.      elderly persons are more susceptible to unwanted CNS effects.

79.    L-dopa in Parkinsonism can be given with:

a.      chlorpromazine.

b.      imipramine.

c.      pargyline.

d.      reserpine.

80.    Phenobarbitone:

a.      is used for grand mal seizures.

b.      is a liver microsomal enzyme inducer.

c.      is hydroxylated in the liver.

d.      can cause sedation.

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