Physiological aspects of the determination of comprehensive arterial inflows in the lower abdomen assessed by Doppler ultrasound

Table 2 Bland-Altman analysis of acceptable range in difference (bias) in hemodynamics via three repeated measurements

Hemodynamics variable		Ao	LFA	RFA	Ab
Blood velocity (cm/sec)	Limit of agreement	0.00 ± 8.93	0.00 ± 4.37	0.00 ± 5.24
	95%CI	0.00 ± 0.67	0.00 ± 0.33	0.00 ± 0.39
Vessel diameter (mm)	Limit of agreement	0.00 ± 1.49	0.00 ± 0.95	0.00 ± 0.77
	95%CI	0.00 ± 0.11	0.00 ± 0.07	0.00 ± 0.06
Blood flow (ml/min)	Limit of agreement	0.00 ± 1008.42	0.00 ± 186.78	0.00 ± 180.71	0.00 ± 922.08
	95%CI	0.00 ± 75.16	0.00 ± 13.92	0.00 ± 13.47	0.00 ± 68.73

Results are based on 180 samplings (comparison between 1^st and 2^nd, 2^nd and 3^rd, and 3^rd and 1^st measurements) in 60 participants. All measurements were performed by a single operator. The mean difference (bias) in each hemodynamic parameter (blood velocity, vessel diameter, and blood flow) between two measurements almost corresponds to zero. Therefore, the limit of agreement is expressed as 0.00 ± 1.96 SD. The 95% of confidence interval (95%CI) is expressed as 0.00 ± 1.96 SE. Ao, abdominal aorta; LFA, left femoral artery; RFA, right femoral artery; Ab, lower abdomen; SD, standard deviation; SE, standard error. This material is reproduced and additional data were provided for analysis from Osada et al. [12], with permission from IOP Publishing Ltd.

ISSN: 1476-7120