Journal of clinical monitoring and computing
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J Clin Monit Comput · Apr 2015
Comparative StudyComparison of two devices using near-infrared spectroscopy for the measurement of tissue oxygenation during a vascular occlusion test in healthy volunteers (INVOS(®) vs. InSpectra™).
The aim of this study was to compare tissue oxygen saturation as measured by INVOS® and InSpectra™ during a vascular occlusion test (VOT) in the same subject. Twenty healthy adults were investigated. The INVOS® and InSpectra™ probes were placed randomly on the right and left thenar eminence in the same participant and monitoring of tissue oxygen saturation (SrO2 from INVOS® and StO2 from InSpectra™) were begun. ⋯ SrO2 declined to 40% more rapidly than did the StO2 (147±38 vs. 199±41 s, p<0.01). The deoxygenation and reoxygenation rates were higher (p<0.01) and the reactive hyperemic area was more extensive for INVOS® than for InSpectra™ (p=0.015). In conclusion, the VOT on the thenar muscle using INVOS® was as clinically applicable as InSpectra™, but baseline values and dynamic changes of INVOS® differed from those of InSpectra™.
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J Clin Monit Comput · Apr 2015
In-line pressure within a HOTLINE(®) Fluid Warmer, under various flow conditions.
Roller pump infusion devices are widely used for rapid infusion, and may be combined with separate warming devices. There may be instances however, where the pressures generated by the roller pump may not be compatible with the warming device. We assessed a commonly used roller pump in combination with a HOTLINE® Fluid Warmer, and found that it could generate pressures exceeding the HOTLINE® manufacturers specifications. ⋯ The post-warmer pressures exceeded 300 mmHg at the flow rate of 140 mL/min with 20-gauge, 48 mm cannula, and 160 mL/min with 20-gauge, 25 mm cannula, while they were <300 mmHg at any flow rates with 18 and 16-gauge cannulae. The in-line pressure within a HOTLINE® could exceed 300 mmHg, depending on the flow rate and size and length of cannula. It is important to pay attention to the size and length of cannulae and flow rate to keep the maximum in-line pressure<300 mmHg when a roller pump type infusion device is used.