نتایج جستجو برای: valsalva maneuver
تعداد نتایج: 8903 فیلتر نتایج به سال:
The Valsalva maneuver, a test frequently used to evaluate autonomic function, recruits discrete neural sites. The time courses of neural recruitment relative to accompanying cardiovascular and breathing patterns are unknown. We examined functional magnetic resonance imaging signal changes within the brain to repeated Valsalva maneuvers and correlated these changes with physiological trends. In ...
Vogel et al. propose that the BP recovery time following phase III of the Valsalva maneuver is a useful index of sympathetic function, particularly in patients with severe sympathetic adrenergic dysfunction. Clinical evaluation of the sympathetic nervous system usually entails the use of tests that indirectly measure autonomic function. The assessment of muscle sympathetic nerve activity with m...
Functional magnetic resonance imaging (fMRI) was used to measure signal changes in the brain during a respiratory challenge that elevated blood pressure. Subjects were scanned during a baseline period and during a Valsalva maneuver. Results were compared using fixed-effects analysis with the SPM99 package, and examined once using a boxcar model and once by models generated from changes in cardi...
Background: Cervical spondylosis is a common progressive degenerative disorder of the human spine often caused by the natural aging process. Osteophytic formations contribute to biomechanical changes that result in neural and vascular compression. The spinal compression of the obliquely passing cervical nerve roots can result in possible autonomic imbalance in the body. Valsalva maneuver is a s...
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