Tenany is caused by which poisoning –
**Core Concept**
Tetany is a clinical condition characterized by muscle cramps, spasms, and weakness, often due to alterations in calcium and magnesium levels. This condition is typically associated with hypocalcemia, which can be caused by various factors, including poisoning.
**Why the Correct Answer is Right**
The correct answer is related to the concept of hypocalcemia-induced tetany. When calcium levels in the blood fall below a certain threshold, it can lead to the depolarization of nerve cells and muscle fibers, resulting in tetanic contractions. This is because calcium plays a crucial role in stabilizing the resting membrane potential of neurons and muscle cells. In the context of poisoning, certain substances can chelate calcium, leading to a decrease in its availability and resulting in hypocalcemia.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because, although it may cause neurological symptoms, it is not typically associated with tetany.
**Option B:** This option is incorrect because it is not a common cause of hypocalcemia or tetany.
**Option C:** This option is incorrect because it is not directly related to the pathophysiology of tetany.
**Clinical Pearl / High-Yield Fact**
It is essential to note that tetany can also be caused by other factors, including hypomagnesemia, alkalosis, and certain medications. A thorough history and physical examination, along with laboratory tests, are necessary to determine the underlying cause of tetany.
**Correct Answer: B. Organophosphate poisoning.**