Age

18–55

Sex

ALL

Healthy volunteers

Not accepted

Tension Type Headache more than 3 time a month
Other primary headaches
Medication prior to the study (closer than 4 times plasma halflife)
Migraine or headache 5 days prior to study.
Hypertension (systolic BP \>150 mmHg and/or diastolic BP \>100 mmHg).
Hypotension (systolic BP \<90 mmHg and/or diastolic BP \<50 mmHg).
Heart-vessel disease of any kind incl cerebrovascular disease.
Anamnestic or clinical signs of psychiatric disease or abuse.
Anamnestic or clinical signs of disease of any kind relevant for participation in the study.

Migraine Inducing Effects and Changes in Brain Haemodynamics of PGI2