Key points are not available for this paper at this time.
In the preceding paper of the present series1it was pointed out that the term nocturnal includes three different clinical syndromes, which may or may not coexist in the same patient. For the first syndrome the term dyspnea was suggested. A patient suffering from this type of respiratory distress is relatively (or entirely) free from 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 of this type is not paroxysmal, but that the discomfort sets in gradually.2 The present paper is concerned with
W. G. Harrison (1934) studied this question.