Carbon Monoxide Headache Triggering Properties as Well as Effects on the Brain's Vessels and Blood Flow

Exclusion Criteria

• •Tension type headache more than 5 dage /month
• •Other primary headaches
• •Daily medication except contraceptives
• •Drug taken within 4 times the halflife for the specific drug except contraceptives
• •Pregnant or lactating women
• •Exposure to radiation within the last year
• •Headache within the last 24 hours before start of trial
• •Hypertension
• •Hypotension
• •Respiratory or cardiac disease
• •Smoking
• •Primary relatives with current or previous migraine