Doppler ultrasound and calcification score: improving vascular access surveillance

Figures & data

Figure 1. Simple scatterplot DU – Qa versus BTM-Qa.

Table 1. Categorical variables.

	Frequency (%)
Race
Caucasian	100.0
Gender
Masculin	72.5
Diabetes status
Diabetic	35.0
Hypertensive status
Hypertensive	57.5
First VA status
Yes	67.5
Previous interventions
No	80.0
Type of VA
Radiocephalic fistula	32.5
Humerocephalic fistula	40.0
Humerobasilic fistula	10.0
Humerobasilic prothesis	7.5
Proximal radiocephalic fistula	7.5
Humerocommunicant fistula	2.5

Table 2. Continuous variables.

	Mean ± standard deviation
Age (years)	64.50 ± 13.68
Time of dialysis (months)	51.35 ± 47.30
Time of VA (months)	47.60 ± 42.11
Thermodilution Qa (mL/min)	1012.00 ± 492.97
Doppler Qa (mL/min)	1032.55 ± 468.75
Average venous pressure (mmHg)	208.50 ± 31.64
Average arterial pressure (mmHg)	−182.20 ± 31.53
Recirculation (%)	11.65 ± 3.12
On-line clearance monitor (OCM)	1.63 ± 0.33
Paratiroid hormone (ng/L)	355.29 ± 252.57
Serum calcium (mg/dL)	8.72 ± 0.49
Serum phosphate (mg/dL)	4.31 ± 1.03
Venous bicarbonate (mEq/L)	23.46 ± 2.53
Serum magnesium (mg/dL)	2.30 ± 0.32
Simple cardiovascular score (SCVS)	3.28 ± 2.77

Figure 2. Boxplot DU-Qa according to SCVS.

Table 3. Kruskal–Wallis and Mann–Whitney tests.

	p-Value
	BTM Qa	DU Qa
Gender	0.262	0.575
Age (thershold 65 years)	0.017	0.012
Diabetes	0.027	0.100
Hypertension	0.989	0.924
First VA	0.036	0.199
Previous endovascular procedure	0.509	0.478
SCVS (0–8 score)	0.173	0.030
Venous pressure (threshold 200 mmHg)	0.203	0.155
Arterial pressure (threshold −185 mmHg)	0.028	0.015
OCM (threshold 1.4)	0.868	0.892
PTH (threshold 400 pg/mL)	0.257	0.239
Calcium (threshold 8 mg/dL)	0.777	0.918
Phosphate (threshold 4 mg/dL)	0.138	0.402
Bicarbonate (threshold 22 mEq/L)	0.615	0.859
Magnesium (threshold 2.3 mEq/L)	0.234	0.389
Recirculation (threshold 10%)	0.145	0.266
Time on dialysis (threshold 48 months)	0.001	0.002
Time of VA (threshold 48 months)	0.112	0.049
VA type	0.079	0.021

Note: Bold values indicate significant p value < 0.05.