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Table 2 Peak velocities and VTI of D 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 39.67 ± 26.52 0.0684 ± 0.0509 38.00 ± 9.15 0.0747 ± 0.0371
Expiration 34.43 ± 19.21 0.0580 ± 0.0354 24.73 ± 9.12 0.0454 ± 0.0243
Inspiratory variation ratio (%) 27.03 ± 16.34 33.72 ± 30.33 65.34 ± 44.38 86.18 ± 66.74
Expiratory variation ratio (%) 20.39 ± 13.40 29.98 ± 24.82 35.00 ± 17.96 45.16 ± 35.49
  1. There were no differences in the peak velocities of D wave in inspiratory phase between the patient group and the control group (P > 0.05), but the peak velocities of D wave in expiratory phase were larger in the patient group than in the control group (P < 0.05), and the respiratory variation ratios of peak velocities of D wave were larger in the control group than in the patient group (P < 0.05); there were no differences in the VTI of D 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 VTI of D wave were larger in the control group than in the patient group (P < 0.05).