<prompt> Poal hypeension is defined as hepatic venous pressure gradient more than:1 mm Hg5 mm Hg10 mm Hg20 mm Hg  <response>: Poal hypeension is defined as the elevation of the hepatic venous pressure gradient HVPG to 5 mmHg. Poal hypeension is caused by a combination of two simultaneously occurring hemodynamic processes. Ref: Harrisons principle of internal medicine 17th edition, chapter 302. 