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To investigate headache score and accompanying symptoms during and after inhalation of carbon monoxide.
To investigate headache score and accompanying symptoms during and after inhalation of carbon monoxide.
With transcranial Doppler imaging, c-scan and laser speckle the investigators will investigate changes in blood flow velocity of the middle cerebral artery (MCA), diameter of the superficial temporal artery (STA), the radial artery and facial skin perfusion.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Active carbon monoxide | Active Comparator | Inhalation of carbon monoxide up to a carboxyhemoglobin concentration 22% |
|
| Air | Placebo Comparator |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Carbon monoxide | Other | carbon monoxide, 4.7, Purity 99.997, inhalation of carbon monoxide in a volume corresponding to carboxyhemoglobin 10 and 20%, calculated from baseline Hg and body mass |
| Measure | Description | Time Frame |
|---|---|---|
| Headache scores, 12 hours | Comparison between carbon monoxide and placebo (atmospheric air) | 12 hours |
| Measure | Description | Time Frame |
|---|---|---|
| Facial blood flow | Carbon monoxide induced changes in facial blood flow before and after inhalation. | [ Time Frame: 0-180 min ] |
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Inclusion Criteria:
Exclusion Criteria:
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Danish Headache Center | Glostrup Municipality | 2600 | Denmark |
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| ID | Term |
|---|---|
| D008881 | Migraine Disorders |
| ID | Term |
|---|---|
| D051270 | Headache Disorders, Primary |
| D020773 | Headache Disorders |
| D001927 | Brain Diseases |
| D002493 | Central Nervous System Diseases |
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| ID | Term |
|---|---|
| D002248 | Carbon Monoxide |
| D000388 | Air |
| ID | Term |
|---|---|
| D017554 | Carbon Compounds, Inorganic |
| D007287 | Inorganic Chemicals |
| D005740 | Gases |
| D010087 | Oxides |
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| AIR | Other | Room air will be administered as placebo |
|
| D009422 | Nervous System Diseases |
| D017601 |
| Oxygen Compounds |
| D001272 | Atmosphere |
| D004777 | Environment |
| D055669 | Ecological and Environmental Phenomena |
| D001686 | Biological Phenomena |
| D008685 | Meteorological Concepts |
| D004778 | Environment and Public Health |