Dopamine in Orthostatic Tolerance
Status
Conditions
Treatments
Details and patient eligibility
About
One goal of this study is to determine whether people with different amounts of dopamine-beta-hydroxylase (DBH) have different responses to events that affect blood pressure and heart rate. We will also study whether increasing dietary salt improves symptoms during upright posture. Finally, we will examine whether the dietary sodium level influences serum DBH activity and whether DBH level influences the response to sodium. DBH levels and the function of the sympathetic or involuntary nervous system will be assessed in normal volunteers and in patients with postural tachycardia syndrome (POTS).
Enrollment
Sex
Ages
Volunteers
Inclusion criteria
- Upright plasma norepinephrine > 600 pg/ml, or
- An increase in heart rate of > 30 beats per minute upon standing, and
- Withdrawal of all medications for at least 3 days, and
- No associated medical illness, and
- Age 18 - 60 years old.
Exclusion criteria
- Older than 60 years of age
- Routinely taking medications affecting the autonomic nervous system
- Any chronic illness (cardiac, pulmonary, endocrine, gastrointestinal, rheumatologic) other than POTS
- Anemia (Hct < 30)
- Women of childbearing age who are pregnant or nursing
- Unable to give informed consent
Trial design
Primary purpose
Allocation
Interventional model
Masking
22 participants in 3 patient groups
Trial contacts and locations
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Data sourced from clinicaltrials.gov
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