Which respiratory rate indicates tachypnea in an adult patient?

Tachypnea is defined as an increased respiratory rate, typically considered to be greater than 20 breaths per minute in adults. In this context, the correct answer is the option representing the highest respiratory rate, which is 28 breaths per minute. A respiratory rate at this level signifies that the patient is likely experiencing a heightened state of respiratory demand, which can be due to various underlying conditions such as anxiety, fever, respiratory distress, or other health issues.

The understanding of normal versus rapid breathing is crucial for assessing a patient's respiratory status. In a normal adult, a resting respiratory rate typically ranges from 12 to 20 breaths per minute. Therefore, a rate of 28 bpm exceeds this range and is indicative of tachypnea, which warrants further evaluation and potentially intervention. Recognizing these variations in respiratory patterns is an essential skill in clinical practice, allowing for timely and appropriate medical response to a patient's needs.