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The intensity of RRIV abnormalities in AD.
0 = normal RRIV test at rest, during deep breathing, and an increase of the RRIV during deep breathing; 1 = abnormal (decreased) RRIV test at rest or during deep breathing or no increase of the RRIV during deep breathing; 2 = abnormal (decreased) RRIV test at rest And during deep breathing And no increase of the RRIV during deep breathing. AD indicates Alzheimer’s disease; RRIV, R-R interval variation.
