What clinical sign is associated with hypocalcemia?

What clinical sign is associated with hypocalcemia?

• A. Prolonged QT interval
• B. Increased heart rate
• C. Dry skin and hair loss
• D. Hypotension and dizziness

Answer: (A)

Hypocalcemia, which is a condition characterized by low levels of calcium in the blood, is known to have specific electrocardiographic manifestations, one of the most notable being a prolonged QT interval. This prolongation occurs due to a delay in cardiac repolarization, which is influenced by calcium's critical role in cardiac action potentials and muscle contractions. When calcium levels are low, the heart's electrical activity is altered, leading to this prolonged interval, which can predispose individuals to potentially life-threatening arrhythmias. The other options present clinical signs that are less directly associated with hypocalcemia. An increased heart rate may occur due to other conditions but is not a hallmark of hypocalcemia. Similarly, dry skin and hair loss are typically associated with conditions like hypothyroidism or vitamin deficiencies rather than low calcium levels. Hypotension and dizziness can arise from a variety of situations, including dehydration or other electrolyte imbalances, but they do not specifically indicate hypocalcemia. Thus, the direct relationship between hypocalcemia and the prolongation of the QT interval makes this the correct answer.

Hypocalcemia, which is a condition characterized by low levels of calcium in the blood, is known to have specific electrocardiographic manifestations, one of the most notable being a prolonged QT interval. This prolongation occurs due to a delay in cardiac repolarization, which is influenced by calcium's critical role in cardiac action potentials and muscle contractions. When calcium levels are low, the heart's electrical activity is altered, leading to this prolonged interval, which can predispose individuals to potentially life-threatening arrhythmias.

The other options present clinical signs that are less directly associated with hypocalcemia. An increased heart rate may occur due to other conditions but is not a hallmark of hypocalcemia. Similarly, dry skin and hair loss are typically associated with conditions like hypothyroidism or vitamin deficiencies rather than low calcium levels. Hypotension and dizziness can arise from a variety of situations, including dehydration or other electrolyte imbalances, but they do not specifically indicate hypocalcemia. Thus, the direct relationship between hypocalcemia and the prolongation of the QT interval makes this the correct answer.