Sign up Latest Topics
 
 
 


Reply
  Author   Comment   Page 2 of 2      Prev   1   2
Kirill

Development Team Member
Registered:
Posts: 94
 #16 
See this calculations. XLS file attach.

The more power, the higher the concentration of blood flow in the legs, hence SmO2 becomes representative for a-v difference.

Allows us to define both the Q and SV.
Would be glad if those who have PhysioFlow independently verified and corrected these calculations.

The test data is not real, just random numbers.

Sel Q formula was created by a physiologist on equipment similar to PhysioFlow , her lack - in the absence of taking into account extraction (A-v or SmO2)  and hemoglobin of the blood

Graphical extrapolation - Holding a line through VT1, to the pulse 190

Blood flow.jpg 

SVcalc.png 

 
Attached Files
xls SV_SMO2.xls (28.50 KB, 2 views)

bobbyjobling

Development Team Member
Registered:
Posts: 214
 #17 
Hi Kirill,
You also need to try to establish uncertainty level for each measurement or calculation you have made else you will not be able to establish a relationship with phisioflow results... that's also assuming physioflow measurements are traceable to some national standards. The calibration certificate For physioflow will have it's own measurament uncertainty too.

For example; from your calculation you get a value of SV of 150ml, physioflow reports 125ml.
You then adjust your calculations to match 125ml.
You repeat the axact same test and now physioflow indicates a SV of 150ml but your calculation indicates 125ml. What do you do?

If you need absolute values you need to calculate the measurament uncertainty value too.

Relative values are bit more manageable as long you establish a method to reset the information, that is why Juerg always says to look at the trends and not at the values.








Kirill

Development Team Member
Registered:
Posts: 94
 #18 
The question is, how can you use the data on SV? What are they better than SmO2 or EchoCG rest SV or Oxygen pulse? It is possible only by the fact that the trend of SV can show, and focusing on it it can be assumed that training on the pulse where the largest SV will lead to an increase in the size of the left ventricle. If this is the case, we do not need absolute accuracy SV volume, we need a true trend of SV.
bobbyjobling

Development Team Member
Registered:
Posts: 214
 #19 
I think you can get an indication on SV going up or down by using more than one MOXY.
If you attache one Moxy on a priority(for exercise)muscle and the second on a non priority muscle and then look how both tHb & SmO2 reacts with a specific SV exercise you can find when SV might be at it's peak.

It is also important to recognise limitation in the theory of using 1 or 2 Moxy and on the training stimulation you are trying to do.

Previous Topic | Next Topic
Print
Reply

Quick Navigation:

Easily create a Forum Website with Website Toolbox.

HTML hit counter - Quick-counter.net