Abstract
Background: 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. Methods: 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. Results: 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. Conclusion: 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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