Rx of choice in chronic alcoholic with normal RBS, normal BUN, but altered sensorium –
First, the core concept here is likely related to alcohol-related neurological complications. Chronic alcoholics can present with various issues. Altered sensorium could be due to several causes like hypoglycemia, Wernicke's encephalopathy, hepatic encephalopathy, or even alcohol withdrawal delirium. But the question states that RBS is normal, so hypoglycemia is out. BUN is normal, which rules out some renal issues, but not directly related here.
Wernicke's encephalopathy is a key consideration here. It's caused by thiamine (vitamin B1) deficiency, common in chronic alcoholics. The triad is confusion, ataxia, and ophthalmoplegia, but not everyone has all three. Altered sensorium fits here. The treatment is thiamine administration, typically IV.
Another possibility is alcohol withdrawal delirium, but that usually has a different management (like benzodiazepines). However, the presence of normal RBS and BUN doesn't point to that. Also, hepatic encephalopathy would have other signs like asterixis or liver disease markers, which aren't mentioned here.
So the correct answer is likely thiamine. The options might be thiamine (like option C or D), but need to check the distractors. The other options could be things like glucose (but RBS is normal), naloxone (for opioid overdose), or something else like dextrose.
In the explanation, the core concept would be thiamine deficiency in alcoholics leading to Wernicke's. The correct answer is thiamine. The wrong options are incorrect because glucose isn't needed (RBS normal), naloxone is for opioids, and others might be for different conditions.
Clinical pearl: Always give thiamine first in alcoholics with altered mental status to prevent Wernicke's encephalopathy. The correct answer is thiamine.
**Core Concept**
Chronic alcoholism is strongly associated with thiamine (vitamin B1) deficiency, which can lead to **Wernicke’s encephalopathy**—a medical emergency characterized by altered mental status, ophthalmoplegia, and ataxia. Thiamine deficiency is a critical differential in altered sensorium among alcoholics, even with normal blood glucose and renal function.
**Why the Correct Answer is Right**
The patient’s altered sensorium in the context of chronic alcoholism strongly suggests Wernicke’s encephalopathy. Thiamine deficiency disrupts the **lactate dehydrogenase and transketolase pathways**, leading to metabolic derangements in the brain. Intravenous **thiamine (100 mg) is the first-line treatment** to prevent irreversible neurological damage. Early administration is critical, even if blood glucose is normal, to avoid precipitation of delirium or coma.
**Why Each Wrong Option is Incorrect**
**Option A:** Glucose administration without thiamine can worsen Wernicke’s encephal