Figure 2From: Body fluids and salt metabolism - Part IIHypotetical diagrams depicting the relationship between initial state of hydration and plasma sodium in acute meningitis (and respiratory infectious diseases). It has been traditionally assumed that hyponatremia is due to inappropriate anti-diuresis (left panel). On the contrary, most recent data indicate that hyponatremia is due to appropriate, volume-dependent anti-diuresis (right panel).Back to article page