**Question:** A 50 year old male presented with history of hematemesis - 500ml of blood and on examination shows BP- 90/60, PR-110bpm and splenomegaly 5cm below lower costal margin. Most probable diagnosis is

A. Hepatitis
B. Hepatocellular carcinoma
C. Malignant hypertension
D. Portal hypertension

**Core Concept:**

The clinical scenario described involves a 50-year-old male presenting with massive hematemesis (vomiting blood) along with other vital signs and physical examination findings. The key elements to consider are:

1. Massive hematemesis (500 ml of blood)
2. Low blood pressure (BP-90/60)
3. High heart rate (PR-110 bpm)
4. Splenomegaly 5 cm below the lower costal margin

**Why the Correct Answer is Right:**

The correct diagnosis in this scenario is **D. Portal hypertension**. The key points that lead to this diagnosis are:

- **Hematemesis (vomiting blood)**: This is a significant symptom in the presented case, indicating recent blood loss.
- **Low blood pressure (BP-90/60)**: Portal hypertension can cause hypotension due to reduced cardiac output and peripheral vasodilation. The combination of low blood pressure and massive vomiting of blood further supports this diagnosis.
- **High heart rate (PR-110 bpm)**: Portal hypertension can lead to increased cardiac output due to increased heart rate and reduced systemic vascular resistance.
- **Splenomegaly 5 cm below the lower costal margin**: Portal hypertension can cause splenomegaly as the enlarged spleen tries to compensate for the increased blood flow due to portal hypertension.

**Why Other Options are Incorrect:**

**A. Hepatitis:** Hepatitis is an inflammation of the liver and does not typically lead to portal hypertension or the clinical manifestations described.

**B. Hepatocellular carcinoma:** Hepatocellular carcinoma is a liver tumor that can cause portal hypertension, but the combination of massive vomiting of blood, low blood pressure, and high heart rate are more consistent with portal hypertension than hepatocellular carcinoma.

**C. Malignant hypertension:** Malignant hypertension is high blood pressure secondary to cancer or other malignancies. In this case, the patient has low blood pressure, leading to the wrong diagnosis.

**Clinical Pearls:**

- **Portal hypertension** is a critical concept to understand as it is a common clinical scenario in gastroenterology and internal medicine.
- **Diagnosis** of portal hypertension is based on the clinical picture, with the combination of massive hematemesis, low blood pressure, and tachycardia being most indicative of portal hypertension.
- **Management** of portal hypertension includes treating the underlying cause, such as liver cirrhosis or portal vein thrombosis, to prevent complications like gastrointestinal bleeding, ascites, and liver failure.