Active clinical trials for "Hypotension, Orthostatic"

Suspension syndrome refers to a potentially life-threatening condition that can occur in unconscious persons after prolonged suspension in a harness. To date, our understanding of the pathophysiology and appropriate treatment is based primarily on case reports and expert opinion. The main pathophysiological hypothesis implicates blood pooling in the lower extremity and lack of return via muscle pumping. However, a recent French study could not support this hypothesis. Other mechanisms, such as a central vagal reflex may play a role in the pathophysiology of suspension syndrome. The aim of this study is to better understand the pathophysiological basis of suspension syndrome and to develop practical recommendations for prevention and treatment.

The purpose of the study is to understand how blood pressure, heart rate, and symptoms of low blood pressure (such as dizziness or nausea) are affected by positional changes and exercise when on land or in the water for people who tend to experience orthostatic hypotension.

SynABPM 2 proof-of-efficacy is a retrospective, multicentre, observational study performed in patients affected by hypotensive reflex syncope who had performed two ABPMs, one before and another after any therapeutical intervention aimed to increase arterial blood pressure

Primary objective: To compare the decrease in systolic blood pressure between hydration and venous contention when switching to a standing position. Hypothesis in that hydration is better than venous contention. Secondary objective: To evaluate the effect of hydration on lowering systolic blood pressure during the passage standing in elderly patients with orthostatic hypotension. Inclusion criteria: Patient aged over 75 years old with orthostatic hypotension proved to 1 and / or 3 min

Rationale: Orthostatic hypotension increases with age and is associated with increased vascular and all-cause mortality. The prevalence of orthostatic hypotension is also increased in diabetic subjects. In order to prevent related adverse events and vascular mortality it is of great interest to examine the prevalence of orthostatic hypotension in elderly diabetic subjects. Objective: To examine the prevalence of orthostatic hypotension and associated adverse events in type 2 diabetic elderly subjects. Study design: Cross-sectional observational study. Study population: Elderly type 2 diabetic subjects (70 years and older).

The purpose of this study is to determine how blood pressure and blood flow are controlled during head-up tilt in a semi-upright position. In this investigation we are studying blood pressure and blood flow to the brain, with and without a medication which lowers blood pressure (Vasotec). We will determine how persons with a spinal cord injury are able to maintain blood flow to the brain (not get dizzy) as they assume a more upright position and their blood pressure decreases.

One of the most physiologically demanding things that older people do every day is to get up in the morning. After spending a night laying flat, where the blood distributes evenly across the body, when they stand in the morning (and the blood rushes to their feet), their cardiovascular system may not be able to compensate and maintain blood flow to the brain. This phenomenon is known as orthostatic or postural hypotension. The investigators have found in a group of young individuals that use of a dawn-simulation light that gradually wakes the brain is able to increase cardiovascular tone prior to arising. The goal of this experiment is to determine whether this dawn simulation light is able to increase cardiovascular tone in older adults such that they would have reduced or absent postural hypotension when they awaken in the morning. This would greatly reduce the risks of falls and their associated morbidities in older adults.

The study is aimed to assess the efficacy of hand-grip in preventing orthostatic hypotension in 20 patients diagnosed with autonomic failure. Five healthy subjects will be studied for comparison. The investigators will evaluate the subjects while on tilt table for 10 minutes and than while mounted from lying down to 70 degrees for additional 10 minutes. Blood pressure, heart rate and symptoms will be continuously measured. First study will evaluate the blood pressure changes. Second measure will include hand-grip maneuver 1 minute before the erect positon. Trans cranial Doppler will assess the intracranial blood flow during the position changes.

The autonomic or automatic nervous system helps control blood pressure. Diseases of the autonomic nervous system may result in a drop in blood pressure on standing in many cases leading to fainting. Diseases that affect the autonomic nervous system include pure autonomic failure, multiple system atrophy and Parkinson's disease, and can present with very similar symptoms and it is sometimes difficult to determine an exact diagnosis. The purpose of the study is to find out if the blood pressure response from taking a single dose of the medication atomoxetine can help in the diagnosis of these diseases.

To characterize the impact of orthostatic hypotension (OH) and reflex syncope on signals measured using a wearable cardiac monitor prototype device. To evaluate the relationship of signals measured from the wearable cardiac monitor prototype device with reported symptom severity of orthostatic intolerance per standard data collection, analysis, and questionnaires.