Q. The dihydropyridines block the following type of calcium channels:
  • (A) L-type voltage sensitive channels
  • (B) T-type voltage sensitive channels
  • (C) N-type voltage sensitive channels
  • (D) Receptor operated calcium channels
πŸ’¬ Discuss
βœ… Correct Answer: (A) L-type voltage sensitive channels
Q. The characteristic feature(s) of dihydropyridine calcium channel blockers is/are:
  • (A) They have minimal negative inotropic action on the heart
  • (B) They have no effect on A-V conduction
  • (C) They do not affect the activation-inactivation kinetics of the calcium channels
  • (D) All of the above
πŸ’¬ Discuss
βœ… Correct Answer: (D) All of the above
Q. The short acting dihydropyridine preparations can aggravate myocardial ischaemia by invoking:
  • (A) Coronary vasospasm
  • (B) Thrombus formation
  • (C) Vagal activation
  • (D) Reflex sympathetic discharge to the heart
πŸ’¬ Discuss
βœ… Correct Answer: (D) Reflex sympathetic discharge to the heart
Q. The cardiac response to verapamil and nifedipine in human subjects is:
  • (A) Verapamil causes tachycardia while nifedipine causes bradycardia
  • (B) Both cause bradycardia
  • (C) Verapamil causes bradycardia while nifedipine causes tachycardia
  • (D) Both cause tachycardia
πŸ’¬ Discuss
βœ… Correct Answer: (C) Verapamil causes bradycardia while nifedipine causes tachycardia