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The modified Allen's test is also performed prior to heart bypass surgery. The radial artery is occasionally used as a conduit for bypass surgery, and its patency lasts longer in comparison to the saphenous veins. Prior to heart bypass surgery, the test is performed to assess the suitability of the radial artery to be used as a conduit.
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During an interval of time τ, as measured by the reference clock, the clock under test advances by τy, where y is the average (relative) clock frequency over that interval. If we measure two consecutive intervals as shown, we can get a value of ( y − y ′ ) 2 —a smaller value indicates a more stable and precise clock.
The modified Allan variance (MVAR), [2] also known as mod σ y 2 (τ), is a variable bandwidth modified variant of Allan variance, a measurement of frequency stability in clocks, oscillators and amplifiers. Its main advantage relative to Allan variance is its ability to separate white phase noise from flicker phase noise.
Watzke-Allen test is a test used in the diagnosis of a macular hole. It is a subjective test based on photoreceptor displacement. [1] Test can be used to differentiate full thickness macular hole from other similar conditions and also to assess retinal function after surgical closure of the hole. [2] [3]
Aside from discovering Buerger disease and Buerger's test, he authored the book "Circulatory Disturbances of the Extremities". [5] He is also credited with developing the Buerger’s exercises or Buerger-Allen exercises which were later modified by Arthus Allen. [7] The exercises intend to improve lower limb circulation. The legs are held at 45 ...
The Nelson–Aalen estimator is a non-parametric estimator of the cumulative hazard rate function in case of censored data or incomplete data. [1] It is used in survival theory, reliability engineering and life insurance to estimate the cumulative number of expected events.
The Tecumseh step test is an exercise test that researchers use to determine a person's cardiovascular fitness level. The Tecumseh step test is a modified version of the Harvard Step Test, [1] and was developed by Professor Henry J. Montoye at the Department of Epidemiology, School of Public Health, University of Michigan. The main differences ...