Timeline for Dimensionless number for blood volume
Current License: CC BY-SA 3.0
15 events
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| Aug 7, 2015 at 18:36 | comment | added | Vance L Albaugh | @bobthejoe - cool... we don't use any of those types of numbers clinically when treating patients. On the research side the bioengineers might use numbers like those you mention for modeling purposes. Clinically we have estimates of blood volume that are "close enough" for treatment purposes. 50+ years ago when you wanted to experimentally measure a volume of any fluid within the body, you used the dilution technique that is shown in my answer above. | |
| Aug 7, 2015 at 17:42 | comment | added | bobthejoe | @VanceAlbaugh, Tau, Damkholer, f-number, Knudsen number, Radians, etc. Nondimensionalization is pretty standard in a lot of engineering fields. I would guess that BV is a good factor to normalize against. That way you can say that a "heart contains 0.05 BV" or "there is a flux of 0.01 BV/minute through this artery". | |
| Jul 27, 2015 at 23:53 | comment | added | Vance L Albaugh | Like? @bobthejoe | |
| Jul 27, 2015 at 23:51 | comment | added | bobthejoe | @vancealbaugh, neither is time and length yet we frequently find ways to nondimensionlize those properties. | |
| Jul 27, 2015 at 13:37 | comment | added | Vance L Albaugh | @bobthejoe that's because volume is not dimensionless | |
| Jul 21, 2015 at 21:36 | comment | added | bobthejoe | Thanks for answering but at @WYSIWYG mentioned, it doesn't really answer. | |
| Jun 19, 2015 at 22:58 | comment | added | Vance L Albaugh | There is no unit that I am aware of for an index of blood volume for research purposes. Clinically we use the historical values of 7% of total body weight - but realize that is based on 70kg males from 50+ years ago. Obese and morbidly obese individuals have different values because the relationship is nonlinear. Check out this for one model (but definitely not the only one) that has been 'attempted' to model blood volume. ncbi.nlm.nih.gov/pubmed/16756741 | |
| Jun 19, 2015 at 15:20 | comment | added | WYSIWYG | @VanceAlbaugh So like there is BMI, is there not a blood volume to body weight ratio such that a range of that factor may be considered healthy? | |
| Jun 19, 2015 at 13:28 | comment | added | Vance L Albaugh | I see what you are saying - larger individuals would have larger volumes of blood. Similar to energy expenditure, though, that's a nonlinear relationship that you would need a large, diverse sample size to measure empirically (not sure if that's been done yet). The numbers we use clinically, like blood volume being 7% of total body weight, only holds in a 'normal size' or near normal weight individual around 70-80kg. Even though the numbers don't hold at the extremes of weight they remain "close enough" for clinical estimation when needed. | |
| Jun 19, 2015 at 5:42 | review | Low quality posts | |||
| Jun 19, 2015 at 15:07 | |||||
| Jun 19, 2015 at 5:34 | comment | added | WYSIWYG | This does not really answer the question. The OP wishes to know if blood volume can be non-dimensionalized. My opinion is that it can be normalized to body size (which seems quite reasonable; larger people would perhaps have higher volume of blood) but I haven't seen any literature on that. | |
| Jun 19, 2015 at 2:20 | comment | added | AliceD♦ | Great that you dug up this old question and answered it. +1 | |
| Jun 19, 2015 at 1:43 | history | edited | Vance L Albaugh | CC BY-SA 3.0 |
added 138 characters in body
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| Jun 19, 2015 at 1:05 | review | Late answers | |||
| Jun 19, 2015 at 1:11 | |||||
| Jun 19, 2015 at 0:41 | history | answered | Vance L Albaugh | CC BY-SA 3.0 |