Hi, i'm currently studying about pressure bag pump flush systems for invasive monitoring transducer. I hope a few question still puzzling me.
When we monitor for invasive line such as CVL and arterial line, we will put pressure at 300mmHg to ensure it infusing 3mL/hr to make sure the lines is patent and to prevent blood back flow from the arterial.
But what I don't understand is how did the 300mmHg deliver exactly 3ml/hr? is there some kind like a calculation or what. If possible some literature as a facts to prove it.
Another question, I have been to 2 different hospital which give different ways of practice. Hospital A practice is if we use double transducer for CVL and Arterial line, then pump 300mmHg, it will give 3mL/Hr each line. So total volume is 6mL/hr (both). It was proven with experimental evidence which it exactly gives 3mls/hr each.
Hospital B practice is if we use the same double tranducer for both lines, then pump 300mmHg, it will give 3mL/Hr. But, it will deliver to both lines. Meaning total volume deliver is 3mL/Hr (both). They rationale is that because they use different set of tranducer where it was calculated by drop factor (which I'm not sure what brand they are using). So, even when they pump 300 mmHg, when it goes into each lines, it will automatic divided into 2. Means 1.5mL/hr each.
But, this discussion going deeper with a question mark:
"How does a same pressure (300mmHg)for double transducer work to give more volume than single transducer?"
"Can a pressure be divided into 2 lines?"
"How does it explain the mechanism of the pressure system in single and double transducer?"
"Can a different IV set transducer affect the systems?"
Please do me a favor. If possible, I need a facts or literature as an evidence for each answer. I have been searching in google, but I still haven't got a clue.. Thank you for giving feedback. Really appreciate it.
OP, not sure if you got your question answered or not, so I will add:
If you took your pressure bag set up to 300mmhg which is attached to the two transducers (one bag - two transducers) and you unscrewed the connection between them.....fluid doesn't drip out at 3ml/hr or 6ml/hr. It POURS out fast! What makes the fluid run at 3ml/hr is that that is all the transducer will allow to flow through. So each transducer allows 3ml/hr through it = total 3ml x 2 transducers = 6ml/hr.
To MunoRN, I also work PICU. If you are under 10kg, your transduced lines run at 1ml/hr. Children over 10kg generally are also put on a pump at 3ml/hr out of habit, but they can also just be set up with a pressure bag and a normal 3ml/hr transducer. The only issue I have ever had with this is that sometimes after drawing blood, the transduced line pump wants to beep occlusion and I have to set the pump to run at 5ml/hr or so for 20 seconds or so to repressurize the line, then I can turn it back down to 1ml/hr again.
Julius Seizure
1 Article; 2,282 Posts
OP, not sure if you got your question answered or not, so I will add:
If you took your pressure bag set up to 300mmhg which is attached to the two transducers (one bag - two transducers) and you unscrewed the connection between them.....fluid doesn't drip out at 3ml/hr or 6ml/hr. It POURS out fast! What makes the fluid run at 3ml/hr is that that is all the transducer will allow to flow through. So each transducer allows 3ml/hr through it = total 3ml x 2 transducers = 6ml/hr.
To MunoRN, I also work PICU. If you are under 10kg, your transduced lines run at 1ml/hr. Children over 10kg generally are also put on a pump at 3ml/hr out of habit, but they can also just be set up with a pressure bag and a normal 3ml/hr transducer. The only issue I have ever had with this is that sometimes after drawing blood, the transduced line pump wants to beep occlusion and I have to set the pump to run at 5ml/hr or so for 20 seconds or so to repressurize the line, then I can turn it back down to 1ml/hr again.