Portal Hypertension Clinical Manifestations and Diagnostic Features

Definition and Pathophysiology

Portal hypertension is defined as a pathological increase in portal pressure with hepatic venous pressure gradient (HVPG) >5 mmHg, with clinically significant portal hypertension (CSPH) occurring at HVPG ≥10 mmHg 2
The condition develops through increased intrahepatic resistance and increased portal blood flow, following the hydraulic equivalent of Ohm's law where "Pressure = Resistance × Flow" 2

Gastrointestinal bleeding is the most frequent and serious complication of portal hypertension, often caused by gastroesophageal varices - dilated submucosal veins in the lower esophagus and stomach that can rupture and cause life-threatening hemorrhage 1, 3
Splenomegaly, or enlarged spleen, is often a prominent physical finding, and can lead to hypersplenism, resulting in reduced blood cell counts (thrombocytopenia, leukopenia) 1, 3
Ascites, or abnormal accumulation of fluid in the peritoneal cavity, is the most common complication of portal hypertension 1

Doppler ultrasound is the first-line investigation for diagnosing extrahepatic portal vein obstruction, while CT or MRI with vascular contrast agents provide confirmation and assessment of extension 4
MR cholangiography should be performed in patients with persisting cholestasis or biliary tract abnormalities suggesting portal biliopathy 4

Previous gastrointestinal bleeding and size of esophageal varices are independent predictors for future gastrointestinal bleeding, and presence of an underlying prothrombotic condition predicts recurrent thrombosis 3
Age, ascites, extension to the superior mesenteric vein, and severity of underlying conditions predict mortality 3