The effects of Valsalva manoeuvre on Ocular Response Analyzer measurements
نویسندگان
چکیده
منابع مشابه
Influence of posture on the Valsalva manoeuvre.
The objective of the present study was to evaluate the influence of posture on the responses of blood pressure (BP) and heart rate (HR) to the Valsalva manoeuvre (VM). Neurohumoral activation, as well as changes in intravascular and intracardiac volumes and pressures, are well known effects of orthostatic stress. These changes are likely to have significant effects on cardiovascular reflexes, s...
متن کاملEffects of assuming constant optical scattering on haemoglobin concentration measurements using NIRS during a Valsalva Manoeuvre
Resolving for changes in concentration of tissue chromophores in the human adult brain with near-infrared spectroscopy has generally been based on the assumption that optical scattering and pathlength remain constant. We have used a novel hybrid optical spectrometer that combines multi-distance frequency and broadband systems to investigate the changes in scattering and pathlength during a Vals...
متن کاملA clinical description of Ocular Response Analyzer measurements.
PURPOSE To examine the interrelationships among the Ocular Response Analyzer (ORA; Reichert Ophthalmic Instruments, Buffalo, NY), Goldmann applanation tonometer (GAT), and corneal geometry measurements in a young, healthy sample. METHODS Central corneal radius, ORA, GAT, and central corneal thickness (CCT) measurements were taken in 99 subjects (age, 21 ± 2 years) who were free of ocular and ...
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ژورنال
عنوان ژورنال: Clinical and Experimental Optometry
سال: 2015
ISSN: 0816-4622,1444-0938
DOI: 10.1111/cxo.12303