Medical MCQ-If an anaesthetist at high altitude uses plenum vaporizers. It will deliver the vapour concentration –

If an anaesthetist at high altitude uses plenum vaporizers. It will deliver the vapour concentration –

Higher than the original concentration at high partial pressure

Lower than the concentration at lower partial pressure

Higher than the concentration at same partial pressure

Lower than concentration at same partial pressure

Question Category:

Anaesthesia

Correct Answer:

Higher than the concentration at same partial pressure

Description:

Plenum vaporizer is typically set to deliver a 1-2 kPa partial pressure of anaesthetic agent. At sea level, where atmospheric pressure is around 100 kPa, this equates conveniently to a concentration of 1-2% of anaesthetic agent (1-2kPa out of 100 kPa). At higher altitude, the atmospheric pressure is low (e.g. 75 kPa). The plenum vaporizer deliver 1-2 kPa partial pressure of anaesthetic agent. So, the concentration of anaesthetic vapours will 1.25 - 2.5% → Greater than the concentration of anaesthetic agent at same partial pressure at sea level.

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