Following are the features of chronic arsenic poisoning except ?
**Core Concept**
Chronic arsenic poisoning is a condition resulting from prolonged exposure to arsenic, a toxic metalloid that can cause various systemic effects. Arsenic exposure can occur through contaminated water, air, or food, leading to a range of health problems.
**Why the Correct Answer is Right**
The correct answer is associated with the pathophysiology of chronic arsenic poisoning, which involves the accumulation of arsenic in the body, leading to the formation of reactive oxygen species (ROS) that damage cellular components. Arsenic exposure also affects the methylation of arsenic, which is a crucial detoxification process. The toxin binds to sulfhydryl groups in proteins, leading to enzyme inhibition and disruption of cellular functions. Additionally, arsenic exposure can cause DNA damage and mutations, contributing to the development of various cancers.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because chronic arsenic poisoning indeed causes skin lesions, which are a hallmark of the condition. Arsenic exposure can lead to the development of melanosis, hyperpigmentation, and, in severe cases, skin cancers.
**Option B:** This option is incorrect because arsenic exposure can indeed cause cardiovascular disease, including hypertension, heart failure, and atherosclerosis. Arsenic can also lead to the development of peripheral vascular disease and Raynaud's phenomenon.
**Option C:** This option is incorrect because chronic arsenic poisoning can indeed cause neurological symptoms, including peripheral neuropathy, cognitive impairment, and encephalopathy. Arsenic exposure can also lead to the development of mood disorders, such as depression and anxiety.
**Clinical Pearl / High-Yield Fact**
A classic exam trap to remember is that chronic arsenic poisoning can masquerade as other conditions, such as diabetes mellitus, hypothyroidism, and chronic kidney disease. A high index of suspicion and a thorough medical history are essential for diagnosing chronic arsenic poisoning.
**Correct Answer: D.**