Carbon monoxide detector awareness

Overview

Carbon monoxide (CO) is a poisonous gas you cannot see, smell, or taste. It comes from burning fuel in things like gas stoves, boilers, or car engines. A carbon monoxide detector is a device that sounds an alarm when CO levels become dangerous in your home, giving you a chance to get to fresh air before you get sick.

Carbon monoxide poisoning is one of the most common causes of accidental poisoning worldwide, especially during colder months when homes are sealed tight and heating appliances are used more.

Anyone can be affected, but people with heart or lung conditions, infants, older adults, and those with anaemia are at higher risk of serious harm from CO poisoning.

Symptoms

Common symptoms

• Headache that feels dull and doesn't go away
• Feeling dizzy or lightheaded
• Feeling sick to your stomach or vomiting
• Confusion or trouble thinking clearly
• Weakness or tiredness
• Chest pain or shortness of breath

Symptoms in children

• Children may have the same symptoms as adults but often get sick faster and more severely.
• They might seem unusually sleepy or irritable, and have trouble feeding or playing.

Symptoms in older adults

• Older adults may have similar symptoms but are more likely to have chest pain or confusion.
• They might mistake symptoms for a flu or other illness, delaying care.

Causes

Main causes

• Faulty gas appliances – including boilers, gas stoves, water heaters, and furnaces – that are not properly maintained
• Blocked or poorly ventilated chimneys, flues, or vents
• Running a car or generator inside a garage or near an open window
• Using charcoal grills, camp stoves, or portable heaters indoors or in enclosed spaces

Risk factors

• Living in a home without a carbon monoxide detector
• Using older or poorly maintained fuel-burning appliances
• Poor ventilation in your home
• Living with someone who smokes indoors or near shared ventilation

When to see a doctor

See a doctor urgently if:

• If you or someone with you has any emergency symptoms listed above, call your local emergency number right away.
• If your CO detector goes off and you feel unwell, get to fresh air and seek immediate medical care.

Book a routine appointment if:

• If you have mild symptoms like a headache that goes away when you leave home but returns, mention it to your doctor.
• If you are worried about possible exposure even without symptoms, you can ask your doctor for advice.

Diagnosis

Doctors diagnose carbon monoxide poisoning with a simple blood test that measures the amount of CO attached to your red blood cells (called carboxyhemoglobin).

Tests that may be done

• Blood test for carboxyhemoglobin level – often done in an emergency room or clinic
• Pulse oximetry to check oxygen levels, though this may not always detect CO

What to expect at your appointment

If you go to the emergency room, the doctor will ask about your symptoms and possible exposure. They will take a blood sample and give you high-flow oxygen to breathe while waiting for results. Treatment usually starts right away if symptoms are moderate to severe.

Treatment

The main treatment for carbon monoxide poisoning is breathing in high concentrations of oxygen. This helps your body replace the CO in your blood with oxygen. In severe cases, you may need hyperbaric oxygen therapy, which involves breathing pure oxygen inside a pressurised chamber.

Self-care at home

• Get to fresh air immediately – open windows and doors, or leave the building.
• Do not go back inside until the source of CO is found and fixed.
• Call your local emergency number for help.

Medical treatments

Doctors provide high-flow oxygen through a mask or tube. For severe poisoning, hyperbaric oxygen therapy may be used to speed recovery and prevent lasting brain damage. Treatment is generally very effective if started quickly.

When is surgery considered?

Surgery is not needed for carbon monoxide poisoning. Some people who have long-term effects may need rehabilitation but not surgery.

Living with this condition

After CO poisoning, you may feel tired or have headaches for a few weeks. Most people recover fully. Follow your doctor's advice about rest and any follow-up appointments.

Lifestyle tips

• Install carbon monoxide detectors on every floor of your home, near sleeping areas.
• Test your detectors monthly and replace batteries at least once a year.
• Have your fuel-burning appliances serviced annually by a qualified professional.

Diet and exercise

No special diet is needed. Gentle activity as you feel able is fine. Listen to your body and rest when tired.

Mental health and emotional wellbeing

After a frightening event like CO poisoning, some people feel anxious or have trouble sleeping. It is normal to feel shaken. Talk to your doctor if these feelings last more than a few weeks.

Prevention

Yes – carbon monoxide poisoning is almost entirely preventable. The key is to install and maintain CO detectors, and to service fuel-burning appliances regularly.

Vaccines

There is no vaccine for carbon monoxide poisoning.

Screening programmes

There is no routine screening for CO levels unless you have symptoms or known exposure. The best screening is having a working CO detector in your home.

Complications

If left untreated

• Brain damage from lack of oxygen, leading to memory loss or difficulty thinking
• Heart problems, especially in people with existing heart disease
• Unconsciousness, coma, or death

Long-term outlook

With prompt treatment, most people recover fully. Even after severe poisoning, many people go on to live healthy lives. The sooner you get to fresh air and medical help, the better your chances of a full recovery.

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