Dose of atropine for premedication per kg body weight is
**Core Concept**
Atropine is an anticholinergic medication used for premedication in patients undergoing surgery to reduce salivary and bronchial secretions. The optimal dose of atropine for premedication is crucial to prevent excessive anticholinergic side effects.
**Why the Correct Answer is Right**
The dose of atropine for premedication is typically 0.01-0.02 mg/kg body weight administered intramuscularly or subcutaneously. This dose range allows for effective blockade of muscarinic receptors without causing significant anticholinergic side effects such as tachycardia, dry mouth, and blurred vision. The mechanism of action of atropine involves competitive antagonism of acetylcholine at muscarinic receptors in the parasympathetic nervous system.
**Why Each Wrong Option is Incorrect**
* **Option A:** This dose is too high and may cause significant anticholinergic side effects, including tachycardia, dry mouth, and blurred vision.
* **Option B:** This dose is too low and may not provide adequate blockade of muscarinic receptors, potentially leading to inadequate reduction of salivary and bronchial secretions.
* **Option C:** This dose is not a standard recommendation for atropine premedication and may be associated with increased risk of side effects.
**Clinical Pearl / High-Yield Fact**
The optimal dose of atropine for premedication should be individualized based on the patient's weight, age, and underlying medical conditions. A dose of 0.01-0.02 mg/kg body weight is generally considered safe and effective.
**Correct Answer: B. 0.01-0.02 mg/kg**