Pitting edema

Hypotonic fluid disorders: hyponatriemia; cells swelling

1.hypertonic lost-loop diuretics, Addison's

2.pure water gain-SIADH secretion

3.hypotonic salt gain-right sided heart failure, cirrhosis,nephrotic syndrom

This link explains very well the pathophysiology of the edema:

http://umed.med.utah.edu/ms2/renal/Word%20files/c)%20Disorders%20of%20Volume_Ed.htm