In a case of alcohol intoxication, motor incordination and judgment errors occur at blood alcohol levels of:
**Core Concept**
Alcohol intoxication leads to impaired motor coordination and judgment errors due to its effects on the central nervous system (CNS), specifically the cerebellum and cerebral cortex. The blood alcohol level at which these symptoms occur is crucial in determining the severity of intoxication.
**Why the Correct Answer is Right**
The correct answer is related to the concept of blood alcohol concentration (BAC) and its effects on the CNS. At a BAC of 80-100 mg/dL, individuals experience impaired motor coordination and judgment errors. This is because alcohol affects the GABA receptors in the cerebellum, leading to ataxia and loss of fine motor control. Additionally, alcohol's effects on the cerebral cortex result in impaired cognitive function and judgment.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it is too low. At a BAC of 20-30 mg/dL, individuals typically experience mild euphoria and relaxation, but not significant impairment of motor coordination or judgment.
* **Option B:** This option is incorrect because it is too high. At a BAC of 200-250 mg/dL, individuals experience severe CNS depression, including coma and respiratory failure.
* **Option C:** This option is incorrect because it is too broad. While a BAC of 50-70 mg/dL may cause some impairment, it is not specific enough to accurately predict the occurrence of motor incoordination and judgment errors.
**Clinical Pearl / High-Yield Fact**
When assessing a patient with suspected alcohol intoxication, it's essential to consider the BAC and the patient's symptoms. A BAC of 80-100 mg/dL is often referred to as the "legal limit" for driving, but it's also a critical threshold for assessing the severity of intoxication.
**Correct Answer:** C. 80-100 mg/dL