Which of the following is NOT a sign of respiratory alkalosis?

The correct answer is vital signs hypotension, as this is not a sign typically associated with respiratory alkalosis. Respiratory alkalosis occurs when there is a decrease in carbon dioxide (CO2) levels in the blood, often due to hyperventilation. As a result, many patients may experience lightheadedness as the body adapts to the altered carbon dioxide levels and subsequent changes in oxygenation.

Hyperventilation is a primary cause of respiratory alkalosis and is characterized by rapid, shallow breathing, leading to the expulsion of more CO2 than the body can produce. This can directly lead to symptoms like lightheadedness, as the brain temporarily experiences decreased blood flow due to changes in pH levels. Carpopedal spasm, which involves involuntary muscle contractions, can also occur due to shifts in ionic balances influenced by the alkalotic state, demonstrating the physiological impact of low CO2 and altered calcium metabolism.

In contrast, hypotension is not a direct or common sign of respiratory alkalosis. While hyperventilation and its associated symptoms are clearly linked to the condition, hypotension is more frequently associated with other medical issues, such as volume depletion or septic conditions, rather than with isolated respiratory alkalosis.