What is orthopnea?

Orthopnea is specifically defined as shortness of breath that occurs when a person is lying flat. This condition is often seen in individuals with certain heart or respiratory conditions, where the gravitational effects on the body can lead to increased fluid in the lungs when horizontal, making it more difficult to breathe. Patients with orthopnea often find relief when they are sitting up or propped with pillows, as this position can help reduce the strain on their respiratory system.

The other options focus on different respiratory issues or conditions not related to body position, such as asthma attacks, loss of consciousness, or chronic conditions characterized by general shortness of breath without the positional aspect, making them distinct from orthopnea. This highlights the unique nature of orthopnea as it specifically addresses the impact of body position on breathing difficulties.