What does the term 'orthopnea' suggest about a patient's positioning preference?

The term 'orthopnea' specifically refers to a condition in which a patient experiences difficulty breathing when lying flat. This leads them to prefer an upright position, such as sitting or standing, in order to relieve their shortness of breath and facilitate easier breathing. Therefore, the correct interpretation is that the patient can only breathe properly when upright. This condition is often associated with heart failure, chronic obstructive pulmonary disease (COPD), or other respiratory issues that worsen in a supine position. As such, understanding the implications of orthopnea is crucial for providing appropriate care and patient comfort.