Carbon monoxide screening in ED patients with headache
This study wants to find out how often carbon monoxide (CO) exposure is behind headaches in people who visit the emergency room. Many people with headaches aren't checked for CO, and it's important to know the signs early. Researchers will use a quick finger sensor and a standard blood test to measure CO levels. They'll also give participants a special monitor to take home for a week, which checks for low levels of CO that common alarms might miss. The aim is to understand how these different tests compare and how often everyday CO exposure contributes to chronic headaches, helping doctors better identify and manage this often-missed issue.
At a glance
What is this study about?
Imagine you have a headache, and you go to the emergency room, but no one can quite figure out why. This study is trying to see if an invisible gas called carbon monoxide (CO) might be causing some of these headaches. CO is a silent danger, often coming from faulty heating systems, boilers, or even fireplaces, especially at low levels that might not trigger a regular alarm at home.
Doctors don't always check for CO in people with headaches, so we don't really know how common it is. If doctors could spot CO-related headaches earlier, they could help people avoid further exposure and prevent long-term health problems. This research will look at different ways to measure CO, including a quick, painless finger test and a standard blood test when you're in the emergency room.
Participants will also get a special, sensitive CO monitor to take home for a week. This monitor can detect much lower levels of CO than standard alarms, giving us a clearer picture of potential environmental exposure. By doing this, the study hopes to find out how often CO causes headaches, how well different tests work, and ultimately help create better guidelines for doctors to identify and treat CO exposure in people with headaches.
Key takeaways
- This study aims to understand how often carbon monoxide causes headaches.
- It uses a quick finger test, a blood test, and a home CO monitor.
- Participation involves short follow-ups over 6 weeks.
- You might gain insight into potential CO exposure in your own home.
- There are no known risks to taking part.
- The findings will help doctors better identify CO-related headaches.
Who may be eligible?
You might be able to take part if you are aged 18 or over and come to the emergency room with a headache. This includes if your headache is your main problem or one of several symptoms. We're looking for people who are likely to be sent home from the emergency department, rather than needing to stay in hospital.
However, you won't be able to join if you are under 18, or if your headache is clearly caused by something else, like a head injury or a stroke. You also can't take part if you need immediate urgent medical attention for another reason, or if you're unable to understand and agree to take part in the study.
Could this study suit you?
Answer these quick questions to see if you may be eligible. This is a guide only — the research team makes the final call.
- Are you 18 years old or older?
- Are you visiting the emergency room for a headache?
- Are you likely to go home from the emergency room today?
- Can you understand and agree to take part in the study?
- Are you able to return a small monitor by post?
What does participation involve?
If you decide to take part, when you're in the emergency department, we will measure your carbon monoxide levels in two ways: first, with a standard blood test (which you might have anyway as part of your usual care), and second, with a quick, painless clip placed on your fingertip. Before you leave, a member of our team will give you a small carbon monoxide monitor to take home, along with instructions and a pre-paid envelope to send it back.
For the next 7 days after you leave the hospital, you'll place the monitor in your kitchen, away from your boiler or stove. Each evening, you'll get a message or email with a link to a short questionnaire about your symptoms. On day 8, you'll post the monitor back to us. You'll receive a £10 bank transfer once we receive the monitor.
Around 14 days after you left the hospital, we'll check in with you again about your symptoms. If the home monitor showed high CO levels, we'll share the results, explain what to do next, and might refer you to a specialist gas service. We'll also do a final check-up about your symptoms around 6 weeks after you left the emergency department.
Potential risks and benefits
Locations (1)
- St Georges University Hospitals NHS Foundation TrustCity onlyLondon, England
Common questions
What is carbon monoxide (CO)?
CO is an invisible, odourless, and tasteless gas. It's often called the 'silent killer' because it can be very dangerous if you breathe in too much of it, coming from things like faulty boilers or gas appliances.
Is the finger sensor painful?
No, the finger sensor is quick and painless. It's like a clip placed on your fingertip, similar to what doctors use to check your oxygen levels.
Do I have to pay to return the home monitor?
No, we will give you a special envelope that already has postage paid, so it won't cost you anything to send it back.
What happens if high CO levels are found at my home?
If your home monitor detects high CO levels, we will contact you, explain what you need to do, and may refer you to a specialist gas service to help sort out the problem.
Will my doctor know I'm in the study?
The information collected will be kept private, but if high CO levels are found that could affect your health, relevant healthcare professionals involved in your care will be informed.
How to find out more
Kathryn Willis
Always speak to your GP or specialist before deciding to take part in a study.
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