About this trial
The study will test the hypothesis that mirabegron is more effective than a placebo in alleviating postural orthostatic tachycardia (POTS) symptoms.
Eligibility criteria
Qualifiers
Provision of a signed and dated informed consent form.
Male or female, age ≥ 18 years old.
Confirmed POTS diagnosis, which includes chronic (>3 months) orthostatic intolerance, an increase in heart rate (HR) of ≥30 beats per minute (bpm) without orthostatic hypotension (>20 mmHg drop of systolic BP) during orthostatic tests.
Disqualifiers
Patients who are pacemaker-dependent because the pacing artifacts will complicate skin sympathetic nerve activity (SKNA) analysis.
Clinically unstable (for example, acute myocardial infarction, decompensated heart failure, undergoing cancer chemotherapy, and other acute illnesses requiring hospitalization)
Uncontrolled hypertension (systolic blood pressure ≥180 mm Hg or diastolic blood pressure ≥110 mm Hg, or both)18
Active thyrotoxicosis
Trial design
Treatments tested in this trial
- Mirabegron
- Placebo