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

Table 4 Peak velocities and VTI of AR wave and their respiratory variation ratios ( ± s).

	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

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).

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