The Effects Of Bronchodilator Therapy On Respiratory And Autonomic Function In Patients With Familial Dysautonomia

• Status: Completed
• Trial end date: 2014-12-01
• Target enrollment: 0
• Participant gender: All

Summary

Evaluate the effects of bronchodilator therapy on respiratory function. Our overall goal is to determine whether, in patients with familial dysautonomia (FD), there is a component of airway obstruction that is reversible. To this end, we will evaluate airway resistance before and after receiving the anti-cholinergic ipratropium (Atrovent ®) and the beta-2-agonist albuterol (ProVentil®/Ventolin®). We predict that the response to either drug will depend on the underlying level of sympathetic and parasympathetic activity and airway tone. We will then determine the cardiovascular effects of inhaled ipratropium and albuterol in patients with FD. Because patients with FD have fewer sympathetic neurons and denervation supersenstivity, we predict that following albuterol inhalation, there will be non-selective activation of alpha-1-adrenergic receptors. Furthermore, because of a congenital defect in the afferent baroreceptor neurons that sense blood pressure, we suspect that the resulting vasoconstriction will be unopposed leading to a pressor effect. We hypothesize that inhalation of the anti-cholinergic ipratopium will produce little rise in heart rate, due to the extent of parasympathetic denervation to the heart.

• Phase: Phase 3
• Accepts Healthy Volunteers?: No

Details

• Lead Sponsor: New York University School of Medicine; NYU Langone Health
• Treatments: Adrenergic Agonists; Albuterol; Bromides; Bronchodilator Agents; Ipratropium

Criteria

Inclusion Criteria:

• 1. Diagnosis of familial dysautonomia (Riley-Day syndrome, hereditary sensory and autonomic neuropathy type III) 2. Ages 12 and older: Bronchodilators are routinely used in young children with FD therefore they should be included in this study. The spirometry maneuver is highly dependent on patient cooperation and effort, and FD patients already have limitations that make the spirometry maneuver more problematic to perform such as difficulty with mouth closure and drooling. Therefore, we believe age 12 is a suitable age for FD patients to be included in this study, though in the general population reliable results can be obtained from the age of 6 and sometimes even younger.

3. Patients using Albuterol or Ipratroprium will be included in the study but will be instructed not to take the 24 hours prior to the testing. It is a common practice in clinical medicine to withhold the inhalation drugs prior to performing pulmonary function tests in order to evaluate the response to bronchodilators, an integral part of the test. Patients with an acute respiratory exacerbation will not be enrolled, as withholding bronchodilators would not be advisable.

4. Patients who are taking medications that might affect autonomic function such as anti-hypertensives, beta-blockers, midodrine and florinef will be included in the study and we will record current medication regimen and the time the medication was taken.

Exclusion Criteria:

• 1. Patients who last used inhaled anti-cholinergics or beta-2-agonists within 4-half lives of the drug.

2. Patients with an acute respiratory illness 3. Patients who have had lobectomies. 4. Patients using oxygen therapy throughout the day. 5. Patients who are unable to comply with the study requirements.