patients with postural orthostatic tachycardia syndrome diagnosis.

Patients with Postural orthostatic tachycardia syndrome who has peripheral neuropathy

Whole blood will be retain for DNA extraction.

Postural Tachycardia Syndrome

Oral glucose tolerance test

Vanderbilt University Medical Center

Gastrointestinal Symptoms in Postural Orthostatic Tachycardia Syndrome

POSTURAL ORTHOSTATIC TACHYCARDIA SYNDROME AND GASTROINTESTINAL SYMPTOMS: Contribution of Gastrointestinal Peptides

The plasma levels of GI peptides (GLP-1, GLP-2, PPY, glucagon, C-peptide, insulin) and their pattern of secretion after ingestion of 75 g glucose.

Gastric emptying time will be measured by acetaminophen absorption test after ingestion of 75 grams glucose.

The gastrointestinal symptoms will be evaluated by questionnaire after ingestion of 75 grams glucose.

Symptoms related to postural orthostatic tachycardia symptoms will be evaluated by specific questionnaire after ingestion of 75 grams glucose.

Cyndya Shibao

Assistant Professor

Dronabinol 2.5 mg will be taken orally with water twice per day for two days.

Dronabinol 5 mg will be taken orally with water twice per day for two days.

Placebo will be taken orally with water twice per day for two days.

Dronabinol 2.5 mg Bid

Dronabinol 5 mg Bid

Placebo

Total

Sex: Female, Male

Region of Enrollment

Body Mass Index (BMI)

The scintigraphic method is used to measure colonic transit. An isotope is adsorbed on activated charcoal particles and delivered to the colon in a delayed release capsule. Anterior and posterior gamma images are taken hourly. The geometric center (GC) is the weighted average of counts in the different colonic regions. The scale ranges from 1 to 5; a high GC implies faster colonic transit, a GC of 1 implies all isotope is in the ascending colon, and a GC of 5 implies all isotope is in the stool.

Colonic Transit Geometric Center

The time for half of the ingested solids or liquids to leave the stomach.

Gastric Emptying Half-Time (t1/2)

Percent of the radio-labeled meal that reached the colon at 6 hours, indirectly reflecting small bowel transit time.

Colonic Filling at 6 Hours

Ascending colon emptying t1/2 will be estimated by power exponential analysis of the proportionate emptying over time of counts from the colon. The primary data for this analysis will be the proportion of decay and depth-corrected counts in the ascending colon on the hourly scans on the first day of transit measurement and the 48 hour data.

Ascending Colon Emptying T 1/2

Proportion of stomach contents emptied at a 2 and 4 hours.

Gastric Emptying at 2 and 4 Hours

Colonic Transit Geometric Center at 24 Hours

Overall Study

Dr. Michael Camilleri

Irritable Bowel Syndrome

Dronabinol is a synthetic delta-9-tetrahydrocannabinol, a nonselective cannabinoid agonist. Subjects will receive either 2.5 mg bid, or 5 mg bid, taken orally with water for 2 days.

Dronabinol

Placebo will match study drug; taken orally with water twice per day for two days.

amide/diare

Gastrointestinal Symptoms in Postural Orthostatic Tachycardia Syndrome

Effect of Cannabinoid Agonist on Gastrointestinal and Colonic Motor Functions in Patients With Irritable Bowel Syndrome (IBS)

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