What is a common manifestation of magnesium toxicity?

• A. Increased reflexes
• B. Absence of knee Jerk
• C. Muscle cramps
• D. Severe headaches

Answer: (B)

Magnesium toxicity, or hypermagnesemia, occurs when there is an excessive amount of magnesium in the body, often resulting from over-supplementation or impaired renal function. A common manifestation associated with magnesium toxicity is the absence of deep tendon reflexes, notably the knee jerk reflex.

This loss of reflex activity happens because magnesium plays a critical role in neuromuscular transmission and muscle contraction. Elevated levels of magnesium can depress neuromuscular activity, leading to reduced excitability at the neuromuscular junction. Therefore, individuals experiencing magnesium toxicity may show diminished or absent reflexes as the nervous system's responsiveness is impaired.

Understanding this relationship is important for recognizing the clinical signs of magnesium overload and managing them effectively in a healthcare setting.