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Valsalva Maneuver hemodynamic response measured using NINscan. (a) O2Hb and HHb measurements from a detector 0.85 cm from the source, and (b) its block averaged result. (c) O2Hb and HHb measurements from the detector 2.35 cm from the source, and (d) its block averaged result. The four phases I, II, III,and IV of Valsava maneuver are clearly demonstrated (see text).
