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Table 4 Peak velocities and VTI of AR 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 18.33 ± 5.29 0.0173 ± 0.0103 17.40 ± 5.82 0.0134 ± 0.0069
Expiration 23.08 ± 7.78 0.0228 ± 0.0119 19.23 ± 5.98 0.0154 ± 0.0075
Inspiratory variation ratio (%) 21.71 ± 16.02 29.79 ± 22.95 9.83 ± 8.81 27.83 ± 40.52
Expiratory variation ratio (%) 29.65 ± 24.91 47.21 ± 46.41 12.11 ± 12.92 34.71 ± 17.12
  1. The peak values and VTI of AR wave were larger in the patient group than in the control group in expiratory phase (P < 0.05), but there were no differences in inspiratory cycle; the respiratory variation ratios of peak values and the expiratory variation ratios of VTI of AR wave were larger in the patient group than in the control group (P < 0.05), but there were no differences in the inspiratory variation ratios of VTI of AR wave between the two groups (P > 0.05).