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nocÂ·turÂ·nal. adj. 1. Of, relating to, or occurring in the night: nocturnal stillness. 2. Botany Opening at night.
Paroxysmal nocturnal dyspnea is also sometimes called cardiac asthma because its signs and symptoms mimic those of asthma. This term is actually misleading -- the two conditions are very different. While asthma is a chronic condition caused by inflammation of the airways, which can lead to breathing difficulties, paroxysmal nocturnal dyspnea is a sign of heart failure. Paroxysmal nocturnal dyspnea can be accompanied by swelling of the feet or ankles.