**Question:** Normal portal venous pressure is -

A. 10-15 mmHg
B. 15-20 mmHg
C. 20-25 mmHg
D. 20-25 mmHg

**Core Concept:**
Portal hypertension is a condition characterized by increased pressure within the portal venous system, leading to elevated pressure in the splanchnic circulation. This can result from various etiologies, such as liver cirrhosis, portal vein obstruction, or portal vein thrombosis. The portal venous system is responsible for draining blood from the gastrointestinal tract, spleen, and pancreas into the liver.

**Why the Correct Answer is Right:**
The correct answer, **10-15 mmHg**, is considered normal portal venous pressure within the context of portal hypertension. Normal portal pressure is usually maintained between 10-15 mmHg. It is essential to understand that portal hypertension results in elevated pressure within the splanchnic circulation, leading to increased resistance and reduced blood flow to the liver and other organs.

**Why Each Wrong Option is Incorrect:**

A. 15-20 mmHg (Incorrect): This option is too high, indicating elevated portal pressure, which is not considered normal.

B. 20-25 mmHg (Incorrect): This range is also too high and suggests portal hypertension.

C. 20-25 mmHg (Incorrect): Similar to options A and B, this range is too high and reflects increased portal pressure.

**Clinical Pearl:**

Understanding normal portal venous pressure is crucial in the context of clinical practice, particularly in diagnosing and managing patients with portal hypertension. Normal portal pressure ensures efficient blood flow to the liver and other splanchnic organs. Elevated portal pressure may result from various conditions, including portal vein obstruction, liver cirrhosis, or portal vein thrombosis. Adequate clinical assessment and knowledge of normal values aid in the early detection and appropriate management of patients with portal hypertension.