Notes:

[1] The term “Max Delivery Rate” means “the maximum flow rate in which target temperature – typically 38°C — will be reached”. Obviously, this measure relates to battery capacity as well; the assumption therefore is that a fully charged battery is used.

[2] “At an input temperature of 20°C and a flow rate of 50 mL/min, the Warrior warmed over 3.5 L to an average temperature of 37.8°C. Flow rates of 100 and 200 mL/min increased total heated volume with small effect on the output temperature (4.3 and 4.8 L at 37.1°C and 36.1°C, respectively). This behaviour persists at an input temperature of 10°C—warming 2.6, 2.9 and 3.3 L to 36.9°C , 35.9°C and 34.4°C at flow rates of 50, 100 and 200 mL/min, respectively. (Lehavi A, Yitzhak A, Jarassy R, et al. Emergency Med Journal, doi:10.1136/ emermed-2017-207112).

[3] “At an input temperature of 20°C and flow of 50 mL/min, the Buddy Lite warmed over 3 L to above 35°C, an energy transfer of more than 44 watt hour (Wh). As the flow increased to 100 mL/min, the Buddy Lite warmed intermittently for 30 min before stabilising at a peak temperature of 33°C (this behavior is demonstrated in figure 2B), heating the first 3 L by only 5°C–8°C, with a maximal temperature exceeding 35°C, achieved after more than 30 min, and lasting for a prolonged period. This translated into low initial energy transfer for the initial 3 L, but equated to heat transfer of greater than 38 Wh when more than 5 L were infused. As flow rate increased to 200 mL/min, the Buddy Lite performance pattern worsened: it consisted of short heating attempts, without stabilising at an appropriate output temperature, providing minimal energy transfer (1.5 Wh). This behaviour persisted at an input temperature of 10°C, regardless of the flow rate. The Buddy Lite was unable to sustain stable, appropriate output temperature and at flow rates of 50, 100 and 200 mL/min it heated fluid by only 1°C–2°C, with minimal heat transfer (6.7, 2.8 and 2.0 Wh, respectively)” (Lehavi A, Yitzhak A, Jarassy R, et al. Emergency Med Journal, doi:10.1136/ emermed-2017-207112).

[4] “At an input temperature of 20°C and flow rates of 50 mL/min and 100 mL/min, the Thermal Angel warmed just under one litre to approximately 36°C. As flow rate increased to 200 mL/min, nearly 1.5 litres reached a substantially lower temperature of 31°C. At an input temperature of 10°C and a flow rate of 50 mL/min, the Thermal Angel warmed under 700 mL to 34°C, with an increase in total heated volume and a further, substantial decrease in output temperature as the flow increased to 100 and 200 mL/min (800 mL and 1.5 litres, at 29.4°C and 20.9°C, respectively).”. (Lehavi A, Yitzhak A, Jarassy R, et al. Emergency Med Journal, doi:10.1136/ emermed-2017-207112).

[5] The term “Battery Capacity” means “the volume of fluids – in liters — that can be warmed with a single, fully charged battery”. Actual output is subject to battery condition, ambient temperature (typically 20°C ambient is assumed) and flow rates. [6] E.g. hand pump; LifeFlow-like devices, etc.

[7] Based on manufacturer’s published data, and as reflected in the independent study results mentioned above, warming efficiency may not suffice for very intense bolus flows. Further, the cassette’s resiliency to sustain the extreme pressure that is often generated by intense push-pull resuscitation techniques need to be validated. It is recommended to consult with the manufacturer.

[8] Based on the independent study results mentioned above, warming efficiency may not suffice for very intense bolus flows. It is recommended to consult with the manufacturer.

[9] Based on manufacturer published data, the device cannot warm blood or near freeze fluids in flow rates exceeding of 100ml/min. Therefore, high flows generated by push-pull resuscitation techniques may be difficult for the device to handle. It is recommended to consult with the manufacturer.

[10] Based on an independent study (Lehavi A, Yitzhak A, Jarassy R, et al. Emergency Med Journal, doi:10.1136, emermed-2017-207112)

[11] Separate warming disposable for blood and fluids

[12] Rounded. Coming soon – lower-cost option ($15-30)

[13] QinFlow’s estimate based on its market research; the stated prices have not been confirmed by the manufacturer