carbon monoxide poisoning (CO)

see also:

• headache
• hypoxia

• carbon monoxide is an odourless gas which can cause insidious poisoning resulting in death
• this is particularly likely in enclosed rooms or in cars (car exhaust fumes piped back into cars are a common mode of suicidality)
• even room exhaust fans can contribute by drawing gas heater exhaust gases back down the flue and into the room
• it is a significant issue also for those inside a house which is burning, including rescuers

• Symptoms of carbon monoxide poisoning include:
  • tiredness
  • shortness of breath
  • headache
  • dizziness
  • nausea
  • weakness
  • confusion
  • chest pain
• NB. patients do not become cyanosed as CoHb levels in blood cause patient to remain pink!

• arterial or venous blood gas measurement with COHb levels

• usual supportive care
• supplemental oxygen

• heaters needs to be routinely checked at least every 2 years, and also if:
  • There is a yellow or sooty flame (unless it is a decorative gas log fire)
  • The pilot light goes out unexpectedly, or ‘pops’ or ‘bangs’ when lighting.
  • There are signs of heat damage such as discoloration of the walls or heater panels.
  • The walls become too hot to touch while the heater is on.
  • There are soot stains around the heater.
  • Missing cowl on flue

• Vic Better Health Channel - gas heaters and CO poisoning
• Energy Safe Victoria - CO testing method