**Question:** All are immediate causes of death in a case of burn, except -

A. Hypovolemic shock
B. Septic shock
C. Respiratory failure
D. Cardiac arrest

**Core Concept:** Immediate causes of death in burn patients are related to the severity of the burn, extent of body surface area involved, and the subsequent complications. These complications can lead to organ failure and life-threatening conditions.

**Why the Correct Answer is Right:**

D. Cardiac arrest is considered an immediate cause of death in burn patients due to the following reasons:
1. Burn injuries cause significant damage to the cardiovascular system, particularly the heart. This damage can lead to myocardial dysfunction, arrhythmias, and eventually, cardiac arrest.
2. The release of inflammatory mediators and the subsequent systemic inflammatory response can increase the risk of arrhythmias and cardiac arrest.

**Why Each Wrong Option is Incorrect:**

A. Hypovolemic shock: While burns can cause significant blood loss, the question specifically mentions "immediate causes of death." Hypovolemic shock usually develops over time due to ongoing blood loss and inadequate fluid resuscitation. It is not an immediate cause of death in burn patients.

B. Septic shock: Although burn injuries can lead to sepsis, septic shock typically develops over time due to the progression of infection and systemic inflammatory response. It is also not considered an immediate cause of death in burn patients.

C. Respiratory failure: Respiratory failure can occur in severe burn patients, particularly when the burns involve the respiratory system. However, the question lists "immediate causes of death" and respiratory failure may not be immediate.

**Clinical Pearl:**

In burn patients, it is crucial to promptly identify and manage the potential immediate causes of death, such as cardiac arrest and sepsis (septic shock), to improve survival rates. Timely resuscitation, pain management, and addressing complications like hypovolemic shock and respiratory failure can help prevent these immediate causes of death.

**Correct Answer:** C. Respiratory failure

By understanding the underlying pathophysiology and complications associated with burn injuries, healthcare providers can promptly recognize and manage the immediate causes of death identified in the question, thereby improving patient outcomes. Early identification and treatment of complications like cardiac arrest, septic shock, and respiratory failure can prevent these life-threatening conditions in burn patients.