Which is not a feature of cocaine poisoning:September 2011
**Question:** Which is not a feature of cocaine poisoning: September 2011
**Core Concept:** Cocaine is a potent central nervous system stimulant, primarily affecting the monoamine neurotransmitters, particularly dopamine, norepinephrine, and serotonin. Cocaine poisoning can present with various clinical manifestations due to its interference with neurotransmitter reuptake and synthesis.
**Why the Correct Answer is Right:** The correct answer, option D, refers to "Increased sweating" as not a feature of cocaine poisoning. Sweating is a normal physiological response to cool down the body, and its increased occurrence is typically associated with hypothyroidism or hyperthyroidism. Cocaine poisoning results in hyperstimulation of the sympathetic nervous system, leading to vasoconstriction, reduced blood flow, and decreased sweating.
**Why Each Wrong Option is Incorrect:**
A. **Increased heart rate:** Cocaine causes a direct stimulation of the central nervous system and the sympathetic nervous system, leading to increased heart rate.
B. **Hypothermia:** Cocaine stimulates the sympathetic nervous system, causing vasoconstriction, reduced blood flow, and decreased sweating, which results in hypothermia. However, in reality, cocaine poisoning results in hyperthermia or high body temperature.
C. **Hypotension:** Cocaine stimulates the sympathetic nervous system, leading to vasoconstriction, reduced blood flow, and decreased peripheral resistance, which results in hypertension (high blood pressure), not hypotension (low blood pressure).
D. **Increased sweating:** As explained above, increased sweating is associated with hypothyroidism or hyperthyroidism, not cocaine poisoning. Cocaine poisoning leads to hyperthermia and vasoconstriction, resulting in decreased sweating.
**Clinical Pearl / High-Yield Fact:** Cocaine poisoning presents with hyperthermia, tachycardia (rapid heart rate), hypertension (high blood pressure), and hypertension (increased blood pressure). These signs and symptoms are caused by cocaine's direct stimulation of the sympathetic nervous system and interference with neurotransmitter reuptake and synthesis.
Understanding these clinical manifestations is essential for differential diagnosis and prompt management of poisoning cases, especially in emergency medicine settings.