**Question:** The following are the main components of the triad of "Heat stroke" Except

A. Increased body temperature
B. Disruption of consciousness
C. Kidney failure
D. Hypotension

**Core Concept:** Heat stroke is a severe and potentially life-threatening hyperthermic condition resulting from the failure of the body's heat dissipation mechanisms. It is characterized by elevated body temperature, impaired consciousness, and potentially organ dysfunction. Heat stroke is primarily caused by excessive exposure to high temperatures, leading to the body's inability to regulate its temperature via sweating.

**Why the Correct Answer is Right:** Hypotension (low blood pressure) is not typically considered a primary component of the heat stroke triad. Hypotension is usually seen in the earlier phases of heat exhaustion or heat stroke, as the body attempts to conserve blood volume to maintain perfusion. However, in established heat stroke, the body has lost its ability to regulate blood pressure effectively, and hypotension usually resolves as the body's core temperature cools down.

**Why Each Wrong Option is Incorrect:**

**Option A (Increased body temperature):** This is the primary and defining feature of heat stroke. Heat stroke results from the inability of the body to dissipate heat through sweating and other mechanisms. Therefore, increased body temperature is the expected finding in heat stroke.

**Option B (Disruption of consciousness):** Impaired consciousness or disturbance in mental status is a crucial component of the heat stroke triad. As the body temperature rises, it affects the brain's function and leads to altered mental status.

**Option C (Kidney failure):** Kidney failure is a potential complication of heat stroke, but it is not a specific element of the heat stroke triad. Kidney dysfunction is often observed later in the course of heat stroke, as the body's cellular and organ dysfunction progresses.

**Option D (Hypotension):** As explained earlier, hypotension is a feature of heat exhaustion or early heat stroke, but it is not a primary component of the heat stroke triad. In heat stroke, hypotension usually resolves as the body temperature decreases upon successful cooling measures.

**Core Concept:** The heat stroke triad is a clinical presentation that helps primary care providers identify and manage the condition promptly. Recognizing this triad allows for timely intervention to prevent progression to organ damage and other complications.

**Clinical Pearl:** Heat stroke is a medical emergency, and early recognition of the triad (increased body temperature, altered mental status, and cardiovascular instability) is crucial for effective management and minimizing morbidity and mortality. Prompt cooling measures, such as fanning, cold water immersion, or cold pack application, should be initiated immediately upon recognition of the triad.