Describe the clinical symptoms of ARS. Enumerate the investigations required. Describe the comprehensive patient management of such cases.

Acute Radiation Syndrome (ARS) occurs after significant exposure to ionizing radiation, typically from a nuclear event or accident. The clinical symptoms of ARS are divided into four distinct phases: prodromal, latent, manifest illness, and recovery or death.

1. Prodromal Phase: This phase occurs within hours to days following exposure and is characterized by gastrointestinal (GI), hematologic, and neurologic symptoms. The severity depends on the radiation dose. Mild exposure leads to nausea, vomiting, fatigue, and headache, while higher doses may cause severe vomiting, diarrhea, and dehydration.

2. Latent Phase: After the initial symptoms subside, the patient may appear symptom-free for hours ___ _____ ______ _____ _________ _____ ____ ____ _______ _____.
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