**Question:** Patient with BP 90/60 mmHg, lips and peripheries are cyanosed; blood drawn was chocolate color. Diagnosis is: DNB 10

**Core Concept:** DNB stands for Deoxygenated blood, which is a term used to describe blood with low oxygen saturation. In the context of this question, DNB refers to the condition where deoxygenated blood is present in the peripheral tissues and the blood drawn appears chocolate-colored. This indicates anemia, which is a decrease in the number of red blood cells or hemoglobin concentration in the blood.

**Why the Correct Answer is Right:**

The correct answer, DNB, signifies the presence of deoxygenated blood (D) with low oxygen saturation (N), leading to the characteristic brownish color (B) in the blood drawn from the patient. This is indicative of anemia, a condition where there is a decrease in red blood cell count or hemoglobin concentration, resulting in a reduced ability to transport oxygen to tissues. In this case, the patient presents with low blood pressure (BP 90/60 mmHg) and cyanosis (blue discoloration of lips and peripheral extremities) due to reduced oxygen delivery to tissues.

**Why Each Wrong Option is Incorrect:**

A. Hypovolemic shock (low blood volume) is not the correct answer because the cyanosis and low blood pressure do not correlate with this condition. Hypovolemic shock typically presents with a rapid heart rate, tachycardia, and a decreased blood pressure with a normal or slightly decreased hemoglobin concentration.

B. Hemolytic anemia (breakdown of red blood cells) is not the correct answer because the chocolate-colored blood indicates the presence of deoxygenated blood (DNB). Hemolytic anemia would lead to hemoglobinuria (red urine), not brownish blood.

C. Acidemia (increased acidity) is not the correct answer because the presence of deoxygenated blood (DNB) indicates hypoxia (low oxygen saturation) rather than increased acidity. Acidemia is unrelated to the brownish color of the blood.

D. Hypothermia (reduced body temperature) is not the correct answer because the chocolate-colored blood indicates hypoxia (low oxygen saturation) due to deoxygenated blood (DNB). Hypothermia does not affect the hemoglobin concentration or color of the blood.

**Clinical Pearl:** Anemia is a common clinical condition that can present with various signs and symptoms, including cyanosis, fatigue, pallor, and shortness of breath. It can be caused by various factors, such as nutritional deficiencies, inherited disorders, or acquired causes like blood loss or hemolysis. A thorough history and physical examination are essential to determine the underlying etiology and guide appropriate management.