Death in Poliomyelitis is due to –
## **Core Concept**
Poliomyelitis, also known as polio, is an infectious disease caused by the poliovirus. This virus primarily affects the **motor neurons** in the spinal cord, leading to muscle weakness and paralysis. The disease can progress to more severe forms, including **bulbar poliomyelitis**, which involves the brainstem and can be life-threatening.
## **Why the Correct Answer is Right**
Death in poliomyelitis is often due to respiratory failure. When the virus affects the **brainstem** (bulbar poliomyelitis), it can impair the function of the **respiratory centers** or damage the nerves that control **diaphragmatic and other respiratory muscles**. This impairment leads to inadequate ventilation, which can cause respiratory failure. The correct answer, therefore, relates to the involvement of the respiratory system, specifically through **respiratory failure**.
## **Why Each Wrong Option is Incorrect**
- **Option A:** While bulbar involvement can lead to issues with **swallowing (dysphagia)**, this is not the primary cause of death in poliomyelitis. Dysphagia can lead to aspiration pneumonia, but it's not as direct a cause of death as respiratory failure.
- **Option B:** **Intestinal obstruction** is not a direct consequence of poliomyelitis infection. Poliovirus primarily affects the nervous system, not the gastrointestinal tract in a way that would cause obstruction.
- **Option C:** **Cardiac failure** is not a typical direct cause of death in poliomyelitis. While there might be secondary effects on the heart due to severe illness, the primary cause of death is related to respiratory function.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that **respiratory failure** is a critical and potentially fatal complication of poliomyelitis, especially in cases with **bulbar involvement**. The use of **iron lungs** (a type of negative pressure ventilator) historically was a lifesaving intervention for patients with severe respiratory muscle weakness.
## **Correct Answer:** . **Respiratory failure**