A nurse is assessing a client who has diabetic ketoacidosis. The client's respirations are deep and regular, with a respiratory rate of 28 and an oxygen saturation of 99% on room air. How should the nurse interpret this finding?

Choice A reason: Orthopnea refers specifically to dyspnea that occurs when an individual is in a recumbent position and is typically relieved by sitting or standing. This condition is frequently associated with left-sided heart failure or pulmonary edema rather than the metabolic acid-base imbalances characteristic of diabetic ketoacidosis. Choice B reason: While the respiratory rate is elevated at 28 breaths per minute, the oxygen saturation remains at 99% on room air. Respiratory distress usually involves hypoxia, cyanosis, or significant work of breathing with low saturation, whereas this compensatory hyperpnea is a physiologic response to metabolic acidosis. Choice C reason: Bradypnea is defined as a respiratory rate that is lower than the expected reference range, typically less than 12 breaths per minute in adults. The client in this scenario has a respiratory rate of 28, which is tachypneic, making the term bradypnea clinically inaccurate and contradictory. Choice D reason: Kussmaul's breathing is a deep, rapid, and labored respiratory pattern specifically triggered by metabolic acidosis, such as diabetic ketoacidosis. The body attempts to compensate for a low serum pH by increasing the exhalation of carbon dioxide, which acts as a volatile acid, to restore acid-base homeostasis.