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SECT. I. CHAP. XII. Of an Asthma.
AMong the Diseases whereby the Region of the breast is wont to be infested, if you regard their tyranny and cruelty, an Asthma (which sometimes by * 1.1 reason of a peculiar symptome is denominated likewise an Orthopnoea) doth not deserve the last place; for there is scarce any thing more sharp and terrible than the fits hereof, the organs of breathing, and the Precordia themselves, which are the foundations and Pillars of Life, are shaken by this disease, as by an Earthquake, and so totter, that nothing less than the ruine of the whole animal Fabrick seems to be threatned; for breathing, whereby we chiefly live, is very much hindred by the assault of this disease, and is in danger, or runs the risque of being quite taken away.
An Asthma is denominated from 〈◊〉〈◊〉 (which is to breathe pursie, or difficultly) and may have this description, that it is a difficult, frequent, and pursie breathing with a great shaking of the breast, and for the most part without any Feaver.
The act of breathing depends as well on moving the Lungs, the Structure whereof ought to be of that sort that its passages, and all the pores may perpetually be open, * 1.2 for the free sucking in and letting out air; as from the parts or organs moving them, which by alternate turns of Systole and Diastole, do cause the hollowness of the breast, and consequently of the Lungs themselves to be dilated, and contracted: whereas there∣fore there are many and divers reasons of disturbance, whereby respiration is preju∣diced, for the most part they may all be reduced to these two heads; viz. that there is a fault either in moving the Lungs or in the parts or Instruments that ought to move them, and from hence the differences and kinds of this disease are best of all design'd; for according to the various nature and position of the morbific cause, it is called an Asthma, eith•…•…r meerly Pneumonick, proceeding altogether from the passages bring∣ing in air being obstructed, or not enough open; or it is meerly convulsive, which only arises by reason of a defect or fault in the motive organs; or mixt, when either parts conspire in the fault, which origine every great and inveterate Asthma is wont to have; of each of these we will treat in order.
1. The ancient Physicians, and for the most part hitherto the Moderns have only acknowledged the first kind of Asthma, judging the next cause, and almost the only * 1.3 cause of this Disease, to be the straitness of the Bronchia, viz. inasmuch as the spa∣ces of those passages, being either straitned together by obstruction, or com∣pression, as often as the use of breathing is required, do not admit of plenty enough of Air, wherefore, for the more free inspiration of air, as shall be needful, the organs of breathing do most difficultly labour, with throes most frequently repeated. But that some are found obnoxious to fits of an Asthma, without manifest taint of the Lungs, it was wont to be ascribed to vapours from the Spleen, Womb, Mesentery, or * 1.4 some other bowel, undeservedly enough; but surely that passion, without the strait∣ness of the Bronchia, or fault of those bowels we have in another place sufficiently evidenced to arise from Cramps of the moving parts, and shall be presently clearly made out. But in the mean time by what means it may arise also from the passages of the Trachea, obstructed, or compressed, it lyes upon me to declare.
The straitness of the Bronchia, inducing the first kind of an Asthma, is suppo∣sed to come to pass by an obstruction, as often as either thick humours and viscous, * 1.5 or purulent matter of blood extravasated, are forced in upon them; or that little swellings as Schirrus's or little Stones, stop up their passages; or finally that a Ca∣tarrh of a serous humour suddenly distils upon them. Moreover the same distemper is thought to be raised by compression, as often as matter of that kind (and of every kind of them) shall cleave to the passages of the Pneumonic Arterie or Vein. Sure∣ly, an Asthmatical disposition depends upon these various causes and manners of di∣sturbance: but all invasions of the disease, or at least the greater fits are usually pro∣voked by reason of some accidents or occasions. For while the stream of blood sliding and running down gently can be content with a small breathing, it passes through the Precordia without great labour either of Lungs or Breast. But being boyling and passing through the Lungs more impetuously, it requires a more full inspiration of air; for the freer admittance of this through strait passages presently all the breathing organs are alarmed into most frequent throes. Whatsoever therefore makes the blood