In the preceding paper of the present series1 it was pointed out that the term nocturnal dyspnea includes three different clinical syndromes, which may or may not coexist in the same patient. For the first syndrome the term "evening dyspnea" was suggested. A patient suffering from this type of respiratory distress is relatively (or entirely) free from dyspnea in the morning when he awakens, but as the day passes increasing respiratory discomfort gradually develops, reaches its maximum in the evening hours and may prevent the sufferer from going to sleep. At length, either with or without the use of sedatives, he finally sleeps and in the morning awakens with less or no respiratory discomfort, only to undergo a repetition of the same cycle. It should be noted that dyspnea of this type is not paroxysmal, but that the discomfort sets in gradually.2
The present paper is concerned with
HARRISON WG, CALHOUN JA, MARSH JP, HARRISON TR. CONGESTIVE HEART FAILURE: XIX. REFLEX STIMULATION OF RESPIRATION AS THE CAUSE OF EVENING DYSPNEA. Arch Intern Med (Chic). 1934;53(5):724–740. doi:https://doi.org/10.1001/archinte.1934.00160110093009
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