Active clinical trials for "Autonomic Nervous System Diseases"

The major aim of this study is to investigate the effects of biofeedback assisted abdominal breathing training on improving the psychological and physiological distress in patients with ACI. In this randomized, controlled, single-blind trial, AIS patients were randomly assigned into experimental and control groups. The experimental group received four HRVBF training sessions. The control group received routine care. Repeated measures of HRV, Mini-Mental Status Examination (MMSE), Hospital Anxiety and Depression Scales (HADS), and Barthel Index for ADLs were collected prior to, and at one, and three months post-intervention.

This study is designed to assess the effect of forearm ischemia-reperfusion injury on sympathetic nerve activity. To determine whether reduced sympathetic responsiveness is a contributor to the protective effects of remote ischemic preconditioning. In addition it will assess whether pharmacologic inhibition of the sympathetic nervous system can ameliorate ischemia reperfusion injury induced endothelial dysfunction.

Introduction: Most cardiovascular diseases (CVD) can be prevented and controlled by adopting lifestyle changes, such as regular physical exercise and nutrition. Resveratrol and beverage extract promote beneficial health effects due to their nutritional properties. Objective: to analyze the effects of resveratrol supplementation and withdrawal extract on post-exercise recovery in coronary heart disease patients. Methods: men diagnosed with ischemic coronary artery disease will undergo four exercise protocols consisting of 30 minutes of aerobic exercise on an ergometric treadmill, with 5 minutes of warm-up, intensity of 30% of the heart rate reserve (HRR), followed by 25 minutes at intensity 60% of FCR and for a final 30 minutes of recovery in the supine position. Before each exercise protocol, all volunteers will consume: 500 mg of placebo (starch), or 500 mg of beetroot, or 500 mg of resveratrol and will also consume resveratrol and drink (500 mg each) 30 minutes before exercise. , the order of each supplementation will be done randomly. Cardiorespiratory parameters and heart rate variability (HRV) will be assessed at different times throughout the experimental procedure. To analyze the moments (rest versus recovery), the Bonferroni post-test will be used for parametric distribution or the Dunn post-test for non-parametric distribution. Statistical significance will be calculated at 5% for all analyses.

Postural Orthostatic Tachycardia Syndrome (POTS) is characterized by symptoms of chronic orthostatic intolerance such as fatigue, lightheadedness, dizziness, palpitations and by pronounced tachycardia upon standing. The aims of the present research study are to test whether a daily transcutaneous vagal nerve stimulation (tVNS) performed for 14 consecutive days may improve heart rate response and reduce disabling symptoms while standing.

Uncontrolled blood pressure represents the main factor in the development of target organ lesions and, consequently, cardiovascular events, which are the leading cause of morbidity and mortality worldwide. In most cases resistant hypertension is preceded by target organ lesions, and is strongly influenced by risk factors or associated diseases. To control this disease requires an adequate and intense therapeutic approach that includes lifestyle changes and the use of several antihypertensive drugs. However, the results are not always satisfactory despite intensive treatment. Of the different pathophysiological mechanisms involved in the pathogenesis of resistant hypertension (RH), two, sympathetic overstimulation and therapies that block the sympathetic system, have been widely studied. But, these approaches are invasive and expensive. Another possible approach is by transcutaneous electrical nerve stimulation (TENS), a non-invasive method that modulates activity by inhibiting primary afferent pathways using low-frequency transcutaneous electrical stimulation. Some studies have shown that TENS reduces blood pressure in patients with hypertension. The current study will evaluate the effect of applying TENS in the cervicothoracic region of subjects with resistant hypertension, seeking to develop a new low cost and readily available therapy to treat this group of hypertensive individuals.

This study will conduct tests in patients with primary chronic autonomic failure (CAF) to learn more about these disorders, which include pure autonomic failure, multiple system atrophy, Parkinson's disease with autonomic failure, and autoimmune autonomic neuropathy. Healthy volunteers and patients with primary CAF 18 years of age or older may be eligible for this study. Participants undergo some of the following tests: Blood studies, including arterial catheter insertion to measure blood pressure and collect arterial blood samples, blood flow studies using sensors applied to the skin and a pressure cuff around a limb, and blood draw for genetic studies. Bladder motility: Ultrasound test of bladder function. Electrocardiogram and heart ultrasound. Responses to changes in temperature: Warm water and then room temperature water are passed through watertight pads applied to the back and front of the body and body temperatures are measured. Gastrointestinal motility: Bowel sounds are recorded using a microphone placed on the abdomen. Lower body negative pressure: The lower body is placed into an airtight barrel-like chamber. Some air is sucked out of the barrel, causing blood to pool in the legs, as occurs during standing. Lumbar puncture: A needle is inserted in the space between the bones in the lower back to collect a small sample of cerebrospinal fluid. Microdialysis to measures levels of chemicals in the body fluid of certain tissues. A solution is passed through a thin tube inserted into the skin. Chemicals in the body tissues enter the solution. The solution is collected and the chemical levels are measured. PET scanning: A nuclear medicine test to produce images of body organs. For patients with urinary problems, a catheter is inserted into the bladder before starting the scan. Pupillometry: The pupil of the eye is measured using a special camera in a light-controlled room. QSART. A small amount of a brain chemical is applied to the skin with a tiny amount of electricity, and the sweat in a nearby patch of skin is measured. Measurement of saliva production, using a cotton-like material placed between the teeth and gums to absorb saliva. Skin electrical conduction test, using sensors on the skin to measure sweat production. Skin and core temperature measurements using sensors on the skin and in the ear canal. Speech and swallowing assessment for patients with speech and swallowing difficulties. Stress echocardiogram: A catheter is placed in the subject's arm for sampling blood or giving a drug while the subject exercises. During the test, blood pressure, pulse rate, and EKG are continuously monitored.

Background: - The autonomic nervous system helps control things that happen automatically in the body, like blood pressure, heart rate, and digestion. When it doesn t work properly, it s called dysautonomia. Researchers want to learn more about dysautonomias and train doctors to learn how to better diagnose them. Objectives: To allow people with autonomic disorders to be evaluated. To help fellows in the NIH Autonomic Disorders fellowship program see a variety of diseases in their training. Eligibility: People age 18 and older with dysautonomia; children over age 2 if they might benefit Healthy adult volunteers Design: Participants will have different procedures depending on their symptoms. They will have one or more visits. They will have some but not all of the tests below. Participants will have a medical history and physical exam. They may be tested for problems thinking. They may complete a symptom questionnaire. They may have their temperature and blood pressure taken. Participants may have an intravenous line placed. A needle will guide a thin plastic tube into an arm vein. Participants may have blood drawn several times. They may give a urine sample. Participants may have an electrocardiogram. How much blood a participant s heart is pumping and/or how much blood is flowing through their arm may be measured. The total amount of blood in their bloodstream may be measured. Participants may have their ability to sweat and/or sense of smell tested. Breathing, bowel sounds, and/or body functions may be monitored. Pupil size, response to environmental temperature changes, and/or breathing may be measured. Participants may have a bladder ultrasound. Small pieces of skin may be taken for study.

Traditional Chinese Medicine (TCM) practitioners believe that health can be maintained if the body has a balanced ying-yang or the qi flows in correct strength and quality along the meridians.Stimulation of the acupoints such as by acupuncture can awaken and modulate qi in the channels and is able to regulate and restore yin-yang balance.However, there are some drawbacks associated with acupuncture which may limit its applications. These include transmission of infectious disease, pneumothorax and other problems associated with organ punctures, cardiac tamponade, and broken needles with remnants migrating to other locations.Studies have shown that when TENS is applied over acupoints (Acu-TENS), it is effective in reducing dyspnoea in patients with chronic obstructive pulmonary disease,facilitate early haemodynamic recovery after open-heart surgery,relieve labor pain,increase in blood β-endorphin level,reduce blood pressure changes in normal healthy subjects and decrease airway resistance.Despite these promising results, how Acu-TENS works still remain unclear.This study aimed to investigate the effects of Acu-TENS over Hegu (LI4) and Quichi (LI4) on the autonomic nervous system activities and to investigate whether the subject could experience distinct sensation as deqi.

Autonomic dysreflexia in high spinal cord-injured can be initiated by a full bladder or bowel, or when trying to empty either. This randomised study aims at evaluating whether irrigation procedure or digital stimulation or evacuation of the rectum is less provocative of autonomic dysreflexia. Participants have their bowels emptied on different days, in the morning fasting. Bladder filling with sterile saline water is evaluated on a third day as a control.

Refractory cardiogenic shock is characterized by a decreased in cardiac output with hypo-responsiveness to increasing doses of catecholamines resulting in a profound tissular ischemia. VAECMO, by restoring a circulatory flow, could be associated to a major reperfusion syndrome which may lead some patients to multiple organ failures and death. Pathophysiology of this syndrome includes 1/an hyper-adrenergic state secondary to the over activation of the sympathetic system and 2/ a major release of pro-inflammatory cytokines. As adrenoreceptors are also exhibited on immunes cells, the pro-inflammatory state might be enhanced by the over-activation of the sympathetic system.