That is what I thought, but if you do that you come up with arterial pressures around 10-40s. They said that a pre pump arterial pressure should be between -200 and -240. I can't find any literature on how or when this is to be done but in crownweb it asks if we are doing it or not. ??
Pre pump arterial pressures should not be greater than negative 200 - 250. I don't think they are referring to pre-treatment arterial pressures, but during treatment. You would monitor venous pressures pre-treatment.
What they are probably looking for is the intra-access pressure (IAP) or "static pressure". A single reading means little as you are actually looking for changes in pressure over time. An increase in IAP would point to a venous stenosis and a decrease would point to an arterial stenosis.
DISCLAIMER : My opinions and views are mine and may not be the same as my employer.
Posts: 1843 | Location: Baltimore, MD USA | Registered: 24 October 2001
The "pre-pump arterial pressure" is just the technical term for the arterial pressure reading on the machine. It is said to be pre-pump because it is measured (via transducer in our K2s) before the blood is passed through the pump on the machine. It should be a reading of between -10 and -250 as pressures beyond -250 are contraindicated due to mechanical hemolysis of blood. Positive arterial pressures at prescribe blood flow rate indicate access complications or failure of the machine to accurately measure the pressure. (eg: the arterial transducer not plugged in to machine during tx.) Hope this helps!