In hypocalcemia presenting with tetany, what is the initial management and evaluation steps?

• A. Administer IV calcium gluconate; check magnesium; correct albumin and vitamin D as needed; monitor for arrhythmias
• B. Oral calcium only; check magnesium
• C. Administer phosphate
• D. Monitor for arrhythmias only

Answer: (A)

The key idea is that acute symptomatic hypocalcemia with tetany requires rapid calcium replacement plus evaluation for factors that modulate calcium balance. Start IV calcium gluconate to quickly raise the serum ionized calcium and relieve neuromuscular irritability, because oral calcium alone cannot correct a dangerous, symptomatic deficit fast enough. While calcium is being given, assess and correct contributing factors, especially magnesium, since hypomagnesemia can suppress PTH secretion and action and make hypocalcemia refractory; low magnesium often needs to be corrected before calcium normalizes.

Also evaluate factors that influence calcium measurements and long-term status. Checking albumin helps interpret total calcium because low albumin lowers total calcium without necessarily changing ionized calcium; if albumin is abnormal, a corrected calcium calculation or, ideally, measurement of ionized calcium guides therapy. Checking vitamin D status and providing supplementation as needed addresses one common cause of hypocalcemia and supports ongoing calcium absorption and homeostasis.

Continuous monitoring for arrhythmias is essential because rapid calcium administration and electrolyte shifts can affect cardiac conduction; adjust therapy based on ECG and clinical response.

In contrast, giving oral calcium alone won’t treat an acute tetany, administering phosphate would worsen the calcium deficit, and monitoring without treatment fails to address the immediate threat.