A person has been brought in casualty with history of road accident. He had lost consciousness transiently and then gained consciousness but again became unconsious. Most likely, he is having brain hemorrhage of
**Core Concept**
A brain hemorrhage, specifically a subarachnoid hemorrhage (SAH), can cause a sudden loss of consciousness due to increased intracranial pressure (ICP) and subsequent cerebral hypoperfusion. This condition is a medical emergency requiring prompt diagnosis and treatment.
**Why the Correct Answer is Right**
The patient's symptoms, including transient loss of consciousness and subsequent recurrence, are consistent with a SAH. This type of hemorrhage occurs when there is a rupture of an aneurysm in the subarachnoid space, leading to bleeding into the cerebrospinal fluid (CSF). The increased ICP and CSF pressure can cause cerebral hypoperfusion, resulting in loss of consciousness. The patient's symptoms suggest a possible aneurysmal SAH.
**Why Each Wrong Option is Incorrect**
* **Option A:** Cerebral edema, while a possible cause of increased ICP, is less likely to cause transient loss of consciousness followed by recurrence. Cerebral edema typically presents with gradual worsening of symptoms.
* **Option B:** Meningitis is an infection of the meninges, which can cause increased ICP and loss of consciousness. However, meningitis typically presents with fever, headache, and neck stiffness, which are not mentioned in the patient's history.
* **Option D:** Brainstem stroke can cause loss of consciousness, but it typically presents with additional symptoms such as cranial nerve deficits, ataxia, and difficulty with speech and swallowing.
**Clinical Pearl / High-Yield Fact**
In cases of suspected SAH, it is essential to perform a non-contrast computed tomography (CT) scan of the brain as soon as possible to confirm the diagnosis. A CT scan can detect blood in the subarachnoid space and help identify the location of the aneurysm.
**Correct Answer:** C.