Anaesthesia Coffee Break

Live viva exam demo for the ANZCA part 1 exam - Pat v1

Mar 27, 2021
Join an engaging discussion on nitrous oxide, where its benefits and risks in anaesthesia are explored. Discover the intriguing world of sympathomimetics, their classifications, and the phenomena of tachyphylaxis and tolerance. Delve into the determinants of intracranial pressure and effective reduction strategies. Lastly, learn about ketamine's unique properties, its advantages and drawbacks for induction, and how it can influence patient care. This insightful dialogue is perfect for anyone preparing for the ANZCA part 1 exam!
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INSIGHT

Entonox Storage And Use

  • Entonox is premixed 50% oxygen and 50% nitrous oxide commonly used in labour.
  • It is stored as a gas rather than a liquid due to mixture vaporisation properties.
INSIGHT

How Sympathomimetics Differ

  • Sympathomimetics either act directly on receptors or indirectly by releasing/inhibiting reuptake of catecholamines.
  • Direct agents are receptor-selective; indirect agents deplete endogenous catecholamine stores.
INSIGHT

Tachyphylaxis Versus Tolerance

  • Tachyphylaxis is rapid loss of drug effect over seconds to minutes requiring higher doses.
  • Indirect sympathomimetics are most likely to cause it due to depletion of endogenous catecholamines.
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