What is the main cause of respiratory alkalosis?

• A. Severe dehydration
• B. Excessive alcohol intake
• C. Hyperventilation
• D. Acute renal failure

Answer: (C)

Respiratory alkalosis primarily arises when there is hyperventilation, leading to an increased rate of carbon dioxide (CO2) elimination from the body. Normally, CO2 is produced during cellular metabolism and is expelled through the lungs during respiration. When a person hyperventilates, they breathe rapidly and deeply, which causes a significant drop in CO2 levels in the blood. As CO2 is a component that forms carbonic acid when dissolved in blood, a reduction in its concentration leads to a decrease in hydrogen ion (H+) concentration, resulting in a higher blood pH and thus causing alkalosis.

Understanding this mechanism is crucial because identifying hyperventilation as the cause of respiratory alkalosis helps healthcare providers manage the patient's breathing pattern and address underlying issues, such as anxiety, pain, or respiratory conditions that may induce hyperventilation.