Cephalic Vascular Recording Upon SPG Stimulation in CH Patients - Amendment to the Pathway CH-1 Trial
Cephalic Vascular Recording Upon SPG Stimulation in CH Patients - Amendment to the Pathway CH-1 Trial
Hypothesis:
Stimulation of the SPG at high frequencies (50-200Hz) is believed to cause a physiological parasympathetic block which decreases VMCA oxyHb concentration and cephalic vessel diameter.
Stimulation of the SPG at low frequencies (1-60 Hz)is believed to cause a physiological parasympathetic upregulation which increases VMCA, oxyHb concentration and cephalic vessel diameter.
Efferent
Inclusion Criteria:
•Subject is currently enrolled in Pathway CH-1 (CIP-001)
Exclusion Criteria:
•Subject is NOT currently enrolled in Pathway CH-1(CIP-001)