**Question:** The immediate treatment of 10 kg weight infants presented with tetany

**Core Concept:** Tetany in infants refers to excessive muscle contractions caused by hypocalcemia, hypomagnesemia, or hypokalemia. These electrolyte imbalances lead to overactivity of the neuromuscular junction, causing involuntary muscle contractions.

**Why the Correct Answer is Right:** The correct answer is D, Calcium Gluconate Injection. Calcium plays a vital role in neuromuscular transmission and muscle contraction regulation. When calcium levels are low, as in hypocalcemia, neuromuscular excitability increases, leading to tetany. Calcium Gluconate Injection is a rapid-acting calcium supplement that corrects calcium levels in the blood, effectively treating tetany.

**Why Each Wrong Option is Incorrect:**

A. Calcium Chloride Injection (Calcium Chloride): This option is incorrect because Calcium Chloride is an ionic form of calcium that is poorly suited for infants due to its potential to cause hypercalcemia and nephrotoxicity.

B. Magnesium Sulfate Injection: Magnesium is a potent competitor for calcium binding sites, and excess magnesium levels can block calcium absorption. In hypocalcemic infants with tetany, this option would worsen the condition rather than treat it.

C. Potassium Chloride Injection: Hypokalemia is not the primary cause of tetany in infants. While hypokalemia can exacerbate tetany in some cases, it is less likely than hypocalcemia and hypomagnesemia.

D. Calcium Gluconate Injection: As mentioned earlier, calcium gluconate is a rapid-acting, non-toxic form of calcium supplementation that addresses calcium deficiency and treats tetany in hypocalcemic infants.

**Clinical Pearl:** It is essential to promptly identify and treat tetany in infants, as unmanaged hypocalcemia can lead to serious complications like seizures, muscle rigidity, and cardiac arrhythmias. Timely administration of the appropriate intravenous calcium supplement (e.g., Calcium Gluconate Injection) will prevent progression of tetany and minimize complications in infants.