Arrangements of the intravenous parallel infusions with anti-reflux valves decreasing occlusion alarm delay.
BACKGROUND
The methods of arrangement of combined intravenous parallel infusions using anti-reflux valve (ARV), with and without anti-syphon valve (ASV) that could decrease occlusion alarm delay were investigated.


METHODS
Occlusion challenge tests were mainly performed as bench experiments of four kinds of multiple parallel infusions (10 ml/h and 50 ml/h infusions), which were connected at the proximal or distal portion of ARV, with or without ASV. Alarm threshold was set to 1000 mmHg. Occlusion alarm delays and the compliances of the infusion systems were compared among groups.


RESULTS
Without ASV, compared to 10 ml/h infusion alone distal to anti-reflux valve, 50 ml/h infusion distal to anti-reflux valve reduced the mean alarm delay from 416 ± 7 s to 81 ± 3 s (P < 0.001). Compared to 50 ml/h infusion alone, combined 10 ml/h and 50 ml/h infusion distal to ARV prolonged the alarm delay from 81 ± 3 s to 133 ± 6 s (P < 0.001). However, combined infusions distal to ARV with ASV significantly reduced the alarm delay from 133 ± 6 s to 74 ± 5 s (P < 0.001), and also reduced the compliance of the infusion system from 2.31 ± 0.12 to 1.20 ± 0.08 µl/mmHg (P < 0.001).


CONCLUSIONS
The infusion setup of faster infusion rate, lower compliant system using ASV could effectively decrease occlusion alarm delay during multiple intravenous parallel infusions using ARV.
Department of Anesthesiology and Pain Medicine, Ajou University School of Medicine, Suwon, Korea.
Han Bum
HB
Joe
Department of Anesthesiology and Pain Medicine, Ajou University School of Medicine, Suwon, Korea.
Bong-Ki
BK
Moon
Department of Anesthesiology and Pain Medicine, Ajou University School of Medicine, Suwon, Korea.
Yeon-Ju
YJ
Lee
Department of Anesthesiology and Pain Medicine, Ajou University School of Medicine, Suwon, Korea.
Sang-Kee
SK
Min
Anesthetics; Equipment safety; Intravenous infusion