The data for evaluation is gathered through computer monitoring of the
R-R intervals using a chest strap sensor applied to the subject's body
(Figure 5). First the patient lies down (supine position) for
several minutes. Then, after a computer-generated signal (beep), the
subject stands up and remains standing (upright position) until the second
computer-generated cue comes on. This concludes the test. During the test
the monitoring device down loads the test data into the computer, where
results are calculated by the Nerve-Express system.
Nerve-Express can test up to four patients simultaneously, with
special devices. The time required to complete the testing is seven to ten
minutes, and the results are sent immediately either to a disk, the
screen, or a printer.
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Fig. 5 Fig. 5
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The Rhythmographic Strip (Fig. 4) correlates to number 1-192 in
the supine position and to 256-448 in the upright. The R-R intervals from
192-256 are dedicated to the transition between the supine and upright
states.
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