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Table 3 Peak velocities and VTI of VR 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 17.15 ± 6.27 0.0159 ± 0.0110 12.77 ± 3.34 0.0080 ± 0.0043
Expiration 19.74 ± 6.71 0.0192 ± 0.0157 15.13 ± 3.90 0.0098 ± 0.0049
Inspiratory variation ratio (%) 16.47 ± 5.51 21.55 ± 12.79 15.75 ± 8.90 17.69 ± 17.08
Expiratory variation ratio (%) 20.21 ± 7.94 27.68 ± 18.19 20.10 ± 14.45 28.25 ± 34.71
  1. The peak velocities and VTI of VR wave were larger in the patient group than in the control group in whole respiratory cycle (P < 0.05), but there were no differences in their respiratory variation ratios.