An obese patient presented in casualty in an unconscious state. His blood sugar measured 400 mg%, urine tested positive for sugar and ketones; drug most useful in management is:
First, I need to recall the treatment protocol for DKA. The primary treatment is intravenous insulin, right? Because insulin helps to lower blood glucose levels and stop ketogenesis. But wait, sometimes people might confuse it with other treatments like fluids or electrolytes. But the question specifically asks for the drug most useful. So insulin is definitely the key here.
Looking at the options, even though they aren't listed, the correct answer is likely insulin. The other options might be things like oral hypoglycemics, which aren't used in acute situations, or maybe something like sodium bicarbonate, which is only used in severe acidosis. But the mainstay is insulin infusion.
Wait, let me make sure. In DKA, the initial treatment is IV fluids to correct dehydration, followed by insulin infusion. But the question is about the drug most useful. So insulin is the drug here. The other options could be things like metformin (not used in DKA), sulfonylureas (oral, not IV), or maybe something like a beta-blocker, which is contraindicated because it can worsen hypoglycemia and mask symptoms.
So the correct answer is insulin. The key is that in DKA, you need to administer insulin intravenously to reverse the metabolic derangements. The other options don't address the root cause of DKA, which is lack of insulin leading to hyperglycemia and ketosis.
**Core Concept**
This question tests the management of **diabetic ketoacidosis (DKA)**, a life-threatening complication of diabetes mellitus characterized by hyperglycemia (>250 mg/dL), ketonemia/ketonuria, and metabolic acidosis. The cornerstone treatment involves **fluid resuscitation, insulin therapy, and electrolyte correction**.
**Why the Correct Answer is Right**
The patient’s presentation (obesity, unconsciousness, hyperglycemia, and ketonuria) is classic for **type 2 diabetes mellitus with DKA** or **hyperosmolar hyperglycemic state (HHS)**. However, DKA is more likely given the presence of ketones. The **most critical drug** is **intravenous regular insulin**, which suppresses gluconeogenesis, promotes glucose uptake, and halts ketogenesis by inhibiting lipolysis in adipose tissue. Insulin also facilitates intracellular potassium shift, addressing hypokalemia common in DKA.
**Why Each Wrong Option is Incorrect**
**Option A:** *Oral hypoglycemics (e.g., metformin)* are ineffective in DKA due to severe metabolic derangements and require IV therapy.
**Option B:** *Sodium bicarbonate* is reserved for pH <6.9 and is not first-line in DKA.
**Option C:** *Beta-blockers* are contraindicated as they may mask hypoglycemic symptoms and worsen insulin resistance.
**Option D:** *Thiazide diuretics* exacerbate