Figure 3: Correlations between upright NPY levels and hemodynamic parameters in the positive-response period in vasovagal syncope children with a mixed inhibitory response. (a) Correlation between the plasma NPY levels and the systolic blood pressure. (b) Correlation between the plasma NPY levels and the diastolic blood pressure. 1 mmHg = 0.133 kPa. NPY: Neuropeptide Y; SBP: Systolic blood pressure; DBP: Diastolic blood pressure.