Atropine used in preanaesthetic produces all EXCEPT
**Core Concept**
Atropine is an anticholinergic medication used in preanesthetic medication to reduce salivation, bronchial secretions, and gut motility, thereby reducing the risk of aspiration and facilitating endotracheal intubation. It blocks the action of acetylcholine at muscarinic receptors, leading to its therapeutic effects.
**Why the Correct Answer is Right**
The therapeutic effects of atropine in preanesthetic medication are primarily due to its ability to block muscarinic receptors in the salivary glands, bronchial tubes, and gastrointestinal tract. This blockade leads to a decrease in the production of saliva, bronchial secretions, and gut motility, making it easier to manage the airway during anesthesia.
**Why Each Wrong Option is Incorrect**
* **Option A:** Anticholinergic effects of atropine can also lead to tachycardia, which is a desired effect in preanesthetic medication to increase cardiac output and reduce the risk of hypotension during induction of anesthesia.
* **Option B:** Atropine can also increase the heart rate and blood pressure due to its vagolytic effects, which is beneficial in preanesthetic medication to prepare the patient for surgery.
* **Option D:** Atropine's anticholinergic effects can also reduce the respiratory secretions, making it easier to manage the airway during anesthesia.
**Clinical Pearl / High-Yield Fact**
Atropine is often used in conjunction with other preanesthetic medications, such as benzodiazepines and opioids, to create a balanced anesthetic effect.
**Correct Answer: A. Atropine does not produce bronchodilation as a primary effect in preanesthetic medication.**