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

Table 1 Peak velocities and VTI of S wave and their respiratory variation ratios ( ± s).

	Patients		Health subjects
	Peak velocity (cm/s)	VTI(mm)	Peak velocity (cm/s)	VTI(mm)
Inspiration	53.00 ± 20.19	0.1038 ± 0.0622	63.30 ± 17.07	0.1647 ± 0.0513
Expiration	39.63 ± 13.48	0.0724 ± 0.0359	43.80 ± 13.88	0.1028 ± 0.0291
Inspiratory variation ratio (%)	32.26 ± 16.49	39.06 ± 34.04	49.67 ± 36.30	68.79 ± 39.64
Expiratory variation ratio (%)	23.32 ± 9.13	24.80 ± 14.57	29.98 ± 14.02	34.71 ± 17.12

There were no differences in the peak velocities of S 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 S wave were larger in the control group than in the patient group(P < 0.05); there were no differences in VTI of S wave in respiratory cycle and its inspiratory variation ratios between the patient group and the control group (P > 0.05), but the expiratory variation ratios of VTI of S wave were larger in the control group than in the patient group(P < 0.05).

ISSN: 1476-7120