you can simply take ratio of Intravascular : total ECF compartment for any person to give you a rough idea. e.g. if intravascular volume is 3L (you can not take the cellular compartment in intravascular compartment) and interstitium is 12L; about 3/(3+12) of amount given should remain intravascular. but things are more complicated than this as we will see in further lectures. once you understand these fluid movements you will figure out more novel ways to treat your patient.
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I have revised this version to make it more clear.
it is difficult especially the formula regarging increase of plasma by addin N/S.
you can simply take ratio of Intravascular : total ECF compartment for any person to give you a rough idea. e.g. if intravascular volume is 3L (you can not take the cellular compartment in intravascular compartment) and interstitium is 12L; about 3/(3+12) of amount given should remain intravascular. but things are more complicated than this as we will see in further lectures. once you understand these fluid movements you will figure out more novel ways to treat your patient.