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Comparison of Different Methods to Assess Fistula Flow
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<i>Background:</i> We compared three access flow (AF) monitoring techniques: blood dilution using ultrasound (US), blood temperature monitoring (BTM), and online clearance monitoring (OCM), and investigated the impact of dialyzer blood flow (Q<sub>B</sub>), measurement time point and patient’s position. <i>Methods:</i> US, BTM and OCM were performed in 20 hemodialysis (HD) patients at Q<sub>B</sub>300. OCM was unreliable for measuring AF and was therefore further omitted. US and BTM measurements were repeated in 10 patients at Q<sub>B</sub>200 ml/min, in 15 patients at the first weekly HD start and end and at the midweek HD start, and switching position during midweek HD. <i>Results:</i> AFs of 1,104 ± 607 (US) and 1,264 ± 664 ml/min (BTM) significantly correlated. No differences were found comparing AF at Q<sub>B</sub>300 and Q<sub>B</sub>200. AF decreased from HD start to end, while no difference was found changing patient’s position. <i>Conclusion:</i> AFs by BTM and US correlated well and may be measured at Q<sub>B</sub>200–300 in all measured positions.
Title: Comparison of Different Methods to Assess Fistula Flow
Description:
<i>Background:</i> We compared three access flow (AF) monitoring techniques: blood dilution using ultrasound (US), blood temperature monitoring (BTM), and online clearance monitoring (OCM), and investigated the impact of dialyzer blood flow (Q<sub>B</sub>), measurement time point and patient’s position.
<i>Methods:</i> US, BTM and OCM were performed in 20 hemodialysis (HD) patients at Q<sub>B</sub>300.
OCM was unreliable for measuring AF and was therefore further omitted.
US and BTM measurements were repeated in 10 patients at Q<sub>B</sub>200 ml/min, in 15 patients at the first weekly HD start and end and at the midweek HD start, and switching position during midweek HD.
<i>Results:</i> AFs of 1,104 ± 607 (US) and 1,264 ± 664 ml/min (BTM) significantly correlated.
No differences were found comparing AF at Q<sub>B</sub>300 and Q<sub>B</sub>200.
AF decreased from HD start to end, while no difference was found changing patient’s position.
<i>Conclusion:</i> AFs by BTM and US correlated well and may be measured at Q<sub>B</sub>200–300 in all measured positions.
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