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 |