Pulsed Wave Doppler Ultrasound Is Useful to Assess Vasomotor Response in Patients with Multiple System Atrophy and Well Correlated with Tilt Table Study

Figure 3

The correlation analysis of hemodynamic variables between SVR and the tilt table study. (a) The HR elevation upon SVR correlated positively with the HR elevation upon head-up tilt (𝑟=0.520, 𝑃=0.005) but (b) negatively with the SBP drop from supine to tilt (𝑟=−0.414, 𝑃=0.029). The SVR latency demonstrated a positive correlation with (c) the SBP drop and (d) MAP drop after tilting up (𝑟=0.486, 𝑃=0.009 and 𝑟=0.5, 𝑃=0.007, resp.). Note: SVR: sympathetic vasomotor response; HR: heart rate; SBP: systolic blood pressure; MAP: mean arterial pressure.

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