GastroFlow: Investigation of the Gastrointestinal Blood Flow in Patients With Postprandial Hypotension

For the PPH group Inclusion Criteria: * Postprandial hypotension * Symptoms of postprandial hypotension Exclusion Criteria: * Treatment with drugs that cannot be paused for 12 hours * Metallic implants that does not tolerate MRI * Any other disease or dysfunction that may disturb blood flow to the gut * Intake of more than 14 units of alcohol per week or abuse of drugs * Blood vessels that are not feasible for measuring flow in the MRI scanner * Low blood percent * Decreased kidney function * Decreased liver function * Claustrophobia For the healthy group Inclusion Criteria: * Matched by age, gender and BMI Exclusion Criteria: * Postprandial hypotension * Metallic implants that does not tolerate MRI * Intake of more than 14 units of alcohol per week or abuse of drugs * Blood vessels that are not feasible for measuring flow in the MRI scanner * Low blood percent * Decreased kidney function * Decreased liver function * Claustrophobia * Autonomic dysfunction or other disease that cause changes in blood pressure during or after a meal * Intake of pharmaceutical products that influence the blood pressure