Muscle Dysfunction in Patients With Chronic Obstructive Lung Disease (COPD): the Role of Sympathetic Activation

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01750489
Recruitment Status : Completed
First Posted : December 17, 2012
Last Update Posted : May 12, 2014
Information provided by (Responsible Party):
Tobias Raupach, University Medical Center Goettingen

Brief Summary:

The objective of the project is to better understand the causes of exercise limitation, dyspnea and neurohumoral activation in patients with COPD. In particular, the investigators aim to explore the mutual interaction of neurohumoral activation and exercise limitation thereby focussing on differential effects of the peripheral muscle and the diaphragm.

Eventually the findings might influence treatment modalities. If sympathetic activation contributes to exercise limitation then drugs influencing the autonomic nervous system would be a reasonable therapeutic concept. If a reduction of sympathetic activity due to an alteration of the ergoreflex can be achieved by non-invasive ventilation this would help to improve dyspnea and exercise capacity.

Condition or disease Intervention/treatment Phase
Chronic Obstructive Pulmonary Disease Device: non-invasive ventilation (NIV) Not Applicable

Detailed Description:
Our aim is to investigate whether reduced exercise capacity, increased respiratory drive and dyspnoea are linked to heightened sympathetic activation at rest and during exercise in patients with COPD. Furthermore, the effect of unloading the respiratory muscles by using non-invasive ventilation (NIV) will be assessed. Fifteen stable COPD patients without NIV will be matched to 15 healthy control subjects (with sufficient microneurography recording). Furthermore COPD patients on regular NIV will be studied. Each participant will undergo symptom limited bicycle exercise and a handgrip protocol. Microneurography will be used to quantify sympathetic activity by the transcutaneous registration of postganglionic sympathetic efferents.

Study Type : Interventional  (Clinical Trial)
Allocation: Non-Randomized
Intervention Model: Parallel Assignment
Masking: Single (Outcomes Assessor)
Primary Purpose: Treatment
Official Title: Skeletal and Respiratory Muscle Dysfunction in Patients With COPD: the Role of Sympathetic Activation
Study Start Date : August 2011
Actual Primary Completion Date : November 2012

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Lung Diseases

Arm Intervention/treatment
No Intervention: COPD
Experimental: COPD with non-invasive ventilation (NIV)
Starting non-invasive ventilation with the patient's own device during registration of MSNA.
Device: non-invasive ventilation (NIV)
No Intervention: Healthy control subjects

Primary Outcome Measures :
  1. muscle sympathetic nerve activity (MSNA) [ Time Frame: 90 minutes ]
    In a 90 minute microneurographic measurement muscle sympathetic nerve activity is assessed.

  2. Arterial stiffness [ Time Frame: 90 min ]

Secondary Outcome Measures :
  1. VE/VCO2 [ Time Frame: During 8-15 minutes bicycle exercise ]

Information from the National Library of Medicine

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Ages Eligible for Study:   30 Years to 80 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Diagnosis of COPD II or III according to the GOLD guidelines
  • FEV1 of less than 60% of the predicted value
  • RV/TLC > 45%
  • Optimal stable medication according to the GOLD guidelines for at least 2 weeks
  • The last exacerbation must not be more recent than three weeks
  • Stable sinus rhythm
  • The subgroup on NIV should be stable on NIV for > 1 month

Exclusion Criteria:

  • not willing or unable to sign the informed consent before the study begins
  • Age under 30 or over 80 years
  • paO2< 55 mmHg or PaCO2 > 45 mmHg on arterial blood gas analysis (For patients on NIV, PaCO2 values of up to 55 mmHg are acceptable.)
  • Treatment with drugs having direct sympathomimetic activity (e.g. theophylline, moxonidine, clonidine)
  • Oral medication with beta2 sympathomimetics (therapy with long-acting inhaled beta2 sympathomimetics is permitted)
  • History of sleep apnoea or documented evidence of > 15 episodes of apneas and/or hypopnea per hour during sleep. An episode of apnea is defined as the cessation of inspiratory airflow for 10 s or more. Hypopnea is defined as a reduction in airflow (> 50%) lasting for more than 10 s in comparison with the maximum airflow recorded during the preceding breathing cycle.
  • Myocardial infarction (MI) or a coronary revascularization procedure within the previous 2 calendar months
  • Clinically evident polyneuropathy
  • Diabetes mellitus necessitating any pharmacologic therapy
  • Severe (i.e., life-limiting) concomitant disease, including life-threatening malignancy (cancer likely to reduce life expectancy to less than 5 years), acquired immune deficiency syndrome, or any other life-threatening disease.
  • Diuretics should not be taken before measurements

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT01750489

Universitaetsmedizin Goettingen
Goettingen, Germany, 37075
Sponsors and Collaborators
University Medical Center Goettingen
Principal Investigator: Stefan Andreas, Professor Universitaetsmedizin Goettingen

Additional Information:
Responsible Party: Tobias Raupach, Dr., University Medical Center Goettingen Identifier: NCT01750489     History of Changes
Other Study ID Numbers: RA1937/1-1
First Posted: December 17, 2012    Key Record Dates
Last Update Posted: May 12, 2014
Last Verified: May 2014

Keywords provided by Tobias Raupach, University Medical Center Goettingen:

Additional relevant MeSH terms:
Lung Diseases
Lung Diseases, Obstructive
Pulmonary Disease, Chronic Obstructive
Respiratory Tract Diseases