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Table 1 Peak velocities and VTI of S wave and their respiratory variation ratios ( ± s).

From: The characteristics of the spectra of superior venae cavae in patients with right heart failure

  Patients Health subjects
  Peak velocity (cm/s) VTI(mm) Peak velocity (cm/s) VTI(mm)
Inspiration 53.00 ± 20.19 0.1038 ± 0.0622 63.30 ± 17.07 0.1647 ± 0.0513
Expiration 39.63 ± 13.48 0.0724 ± 0.0359 43.80 ± 13.88 0.1028 ± 0.0291
Inspiratory variation ratio (%) 32.26 ± 16.49 39.06 ± 34.04 49.67 ± 36.30 68.79 ± 39.64
Expiratory variation ratio (%) 23.32 ± 9.13 24.80 ± 14.57 29.98 ± 14.02 34.71 ± 17.12
  1. There were no differences in the peak velocities of S wave in respiratory cycle and its expiratory variation ratios between the patient group and the control group (P > 0.05), but the inspiratory variation ratios of S wave were larger in the control group than in the patient group(P < 0.05); there were no differences in VTI of S wave in respiratory cycle and its inspiratory variation ratios between the patient group and the control group (P > 0.05), but the expiratory variation ratios of VTI of S wave were larger in the control group than in the patient group(P < 0.05).