Cough According to Stimulus Type in PD

Phase 1

Completed

• Conditions: Parkinson's Disease
• Interventions: Drug: Capsaicin vapor; Other: fog; Radiation: Videofluoroscopic swallow evaluation; Device: Nebulizer

• Registration Number: NCT02390089
• Lead Sponsor: University of Florida

Brief Summary

Aspiration pneumonia (APn) occurs at a higher rate in patients with Parkinson's disease (PD) versus healthy adults. This is of particular public health concern given that death secondary to aspiration pneumonia and lung infection is a leading cause of death in persons with PD. Swallowing and cough function are affected in PD, putting people with PD at significant risk for uncompensated aspiration (aspiration without adequate cough response). One challenge in the management of airway protective deficits related to PD is the chronic and progressive nature of the disease, where swallowing dysfunction appears subtly in the form of microaspiration, reducing the perceived urgency of the swallowing disorder by both clinicians and patients. The long-term goal of this research is to advance the management of airway protection deficits in patients with neurodegenerative disease in order to decrease morbidity and mortality due to aspiration related lung infection. The objective here is to further specify deficits leading to uncompensated airway compromise in PD in order to advance the clinical management of these patients, leading to an immediate positive impact.

Detailed Description

The study will be completed in one visit, and take about an hour. All study procedures are done in the investigators quiet clinical research area at the Center for Movement Disorders and Neurorestoration (Room 7). If participants agree to be in this research study, after participants sign the informed consent form, the investigators will ask participants some questions related to participants health history. These questions include:

Do participants have a history of any breathing disorders or diseases (asthma, emphysema/chronic obstructive pulmonary disease (COPD), etc), or severe chest injury?

* Do participants have any history of stroke, or any neurologic disease besides Parkinson's disease?

* Have participants smoked in the last 5 years?

* Have participants had any chest infections within the last 5 the weeks?

* Do participants have a history of head and neck cancer?

* Are participants allergic to capsaicin, hot peppers, Zostrix cream, or other medicines?

The investigators will ask these questions to make sure participants do not have a history of any illnesses that would affect their ability to cough or that would make it unsafe for them to participate. If participants answer yes to any of these questions, they will not be able to continue in the study.

Next, the investigators will begin to measure participants reflex cough. First, the investigators will attach a small microphone with a clip to participants shirt that will record participants cough responses. The investigators will have participants inhale a "hot pepper" vapor at five different concentrations. The hot pepper vapors will be separately delivered through a mouthpiece attached to a hand-held nebulizer (a device that makes vapors out of liquids). The investigators will deliver each type of vapor to participants 3 times each for a total of 15 presentations. After inhaling each vapor and coughing if participants need to, the investigators will ask participants to rate their urge to cough using a scale of 0-10, with 0 equaling no urge to cough, and 10 equaling the greatest urge to cough. If participants do not cough to any of the vapors, the investigators will present one final stronger dose. There will be a 2 minute break in between each presentation of the vapor, and water will be available at all times throughout the study. This will take approximately 40 minutes.

Next, the investigators will continue to measure participants reflex cough using a slightly different test. The investigators will have participants inhale water vapor (fog) and a low concentration of hot pepper vapor. Both types of vapor will be in separate nebulizers, like the ones the investigators just used. For these vapors, participants will breathe in and out through the nebulizer's mouthpiece until participants cough, or for up to 1 minute. The investigators will try each one 3 times, for a total of 6 tries.

Study Timeline

• Study First Submitted: 2015-02-19
• Study First Submitted QC: 2015-03-16
• Study First Posted: 2015-03-17
• Study Start: 2015-04
• Primary Completion: 2017-02-10
• Status Verified: 2019-02
• Study Completion: 2019-02-13
• Last Update Submitted: 2019-02-13
• Last Update Posted: 2019-02-15

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 158

Inclusion Criteria

• Within age limits
• For PD group: confirmed diagnosis of idiopathic parkinson's disease

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Exclusion Criteria

• Uncontrolled hypertension

• Difficulty complying due to neuropsychological dysfunction (i.e., severe depression)

• Allergy to capsaicin or hot peppers

• History of head or neck cancer

• Neurological disorders other than PD (i.e., stroke, etc.)

  1. control participants only: any history of neurologic disorders including PD

• History of smoking in the last 5 years

• Breathing disorders or diseases

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
Healthy control	Capsaicin vapor	Healthy age-matched adult participants with no history of Parkinson's disease Participants in this group will receive capsaicin vapor cough provocation test. The vapor will be delivered using a small hand-held nebulizer.
Parkinson's disease - no PA	Capsaicin vapor	People with Parkinson's disease without penetration or aspiration during swallowing; based on results of videofluoroscopic swallow evaluation. Participants in this group will receive capsaicin vapor and fog cough provocation test using a small, hand-held nebulizer.Participants in the group will also receive a fluoroscopic swallow evaluation.
Parkinson's disease - PA	Capsaicin vapor	People with Parkinson's disease with penetration or aspiration during swallowing;based on results of videofluoroscopic swallow evaluation.Participants in this group will receive capsaicin vapor and fog cough provocation test using a small, hand-held nebulizer. Participants in the group will also receive a fluoroscopic swallow evaluation.
Parkinson's disease - PA	fog	People with Parkinson's disease with penetration or aspiration during swallowing;based on results of videofluoroscopic swallow evaluation.Participants in this group will receive capsaicin vapor and fog cough provocation test using a small, hand-held nebulizer. Participants in the group will also receive a fluoroscopic swallow evaluation.
Parkinson's disease - no PA	Videofluoroscopic swallow evaluation	People with Parkinson's disease without penetration or aspiration during swallowing; based on results of videofluoroscopic swallow evaluation. Participants in this group will receive capsaicin vapor and fog cough provocation test using a small, hand-held nebulizer.Participants in the group will also receive a fluoroscopic swallow evaluation.
Parkinson's disease - no PA	Nebulizer	People with Parkinson's disease without penetration or aspiration during swallowing; based on results of videofluoroscopic swallow evaluation. Participants in this group will receive capsaicin vapor and fog cough provocation test using a small, hand-held nebulizer.Participants in the group will also receive a fluoroscopic swallow evaluation.
Parkinson's disease - PA	Videofluoroscopic swallow evaluation	People with Parkinson's disease with penetration or aspiration during swallowing;based on results of videofluoroscopic swallow evaluation.Participants in this group will receive capsaicin vapor and fog cough provocation test using a small, hand-held nebulizer. Participants in the group will also receive a fluoroscopic swallow evaluation.
Healthy control	Nebulizer	Healthy age-matched adult participants with no history of Parkinson's disease Participants in this group will receive capsaicin vapor cough provocation test. The vapor will be delivered using a small hand-held nebulizer.
Parkinson's disease - no PA	fog	People with Parkinson's disease without penetration or aspiration during swallowing; based on results of videofluoroscopic swallow evaluation. Participants in this group will receive capsaicin vapor and fog cough provocation test using a small, hand-held nebulizer.Participants in the group will also receive a fluoroscopic swallow evaluation.
Parkinson's disease - PA	Nebulizer	People with Parkinson's disease with penetration or aspiration during swallowing;based on results of videofluoroscopic swallow evaluation.Participants in this group will receive capsaicin vapor and fog cough provocation test using a small, hand-held nebulizer. Participants in the group will also receive a fluoroscopic swallow evaluation.

Primary Outcome Measures

Name	Time	Method
Positive/negative cough response	10 minutes	A positive response is 2 coughs produced to 2/3 trials of the stimulus
Urge-to-cough sensitivity	30 minute	Slope of the line created by plotting urge-to-cough (scale of 1-11) with capsaicin concentration (5 doses of increasing intensity).

Secondary Outcome Measures

Name	Time	Method
Cough sensitivity threshold	30 minutes	the lowest concentration of capsaicin that elicits a perceived urge to cough of 1 (very slight) in at least 2/3 trials
Cough motor threshold	30 minutes	the lowest concentration of capsaicin that elicits at least 2 cough responses in 2/3 trials
Latency	10 minutes	Time from stimulus presentation to cough produced.

Trial Locations

Locations (1)

University of Florida Center for Movement Disorders and Neurorestoration; 🇺🇸 Gainesville, Florida, United States