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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.
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.
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 test was developed at Harvard University in 1942. [3] Several modified versions of the original Harvard step test exist; examples include the Tecumseh step test and the Kasch step test. [5] Another modified version, the Sharkey step test, was developed in the 1970s for use by the United States Forest Service at the University of Montana in ...
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 ...
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 ...
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Watzke-Allen test is done by projecting a thin line of light over the macula with a slit lamp. [4] A fundus lens or macular lens is used to aim beam of light on the macula. [5] It is best performed in a dilated eye, projecting a slit beam of approximately 100 μm. The slit is projected in both vertical and horizontal orientations. [6]