Systemic edema Idiopathic edema Diurnal alterations in weight occurring with orthostatic retention of sodium and water Increase in capillary permeability fluctuate in severity aggravated by hot weather Reduction in plasma volume in this condition with secondary activation of the RaA systemSystemic Edema Idiopathic Edema • Diurnal alterations in weight occurring with orthostatic retention of sodium and water • Increase in capillary permeability fluctuate in severity aggravated by hot weather • Reduction in plasma volume in this condition with secondary activation of the RAA system