Chap. 2. Of the Palpitation, or Breathing of the Heart.
AS in a Synoope the motion of the Heart is diminished, so in this Disease it is depraved. It i•• wrongly stiled by some a trembling of the Heart, when trembling is a passion of the Animal and voluntary motion, and is not proper to any parts but such as have voluntary motion.
Galen in his Book of Trembling, Palpitation, and Convulsion, saith, That Palpitation comes on∣ly from the Disease that is from the Cause which lifteth up, and depresseth the part, without any help of the Faculty; but Trembling comes partly from the Faculty, partly from the Disease. Hence it is that many using the word Palpitation indifferently to any part, think it is in the Heart, as in the Skin and Muscles, in which it comes from wind driven violently thither: for if the Heart be moved as a Bladder by water or wind, they suppose that to be a Palpitation. But the reason is different; for the Skin and Muscles cannot naturally dilate and contract themselves, but by Diseases. But the Heart hath a Natural Faculty to contract and dilate it self, therefo••e a Palpitation cannot be without its motion. And they do in vain muster up Galens Reasons, so thought by them, to prove that the Palpitation of the Heart comes not by Nature, but by a Di••ease, or cause of a Disease. For Galen in all those places speaks of no other Palpitation than that which is in the Skin and other external parts, and not of the palpitation of the Heart, which is of another Nature; and Galen 2. de sympt. caus. cap. 2. saith that the Palpitation of the Heart and Arteries, is different from that of the other parts.
Therefore the Palpitation of the Heart is an immoderate and preternatural shaking of the part, with a great Diastole or Dilatation, and a vehement Systole or contraction which somtimes is so great that as Fernelius observes, it hath often broken the Ribs adjoyning, & somtimes displaced them which are over the Paps; and somtimes it hath so dilated an Artery forth into an Aneurism as big as ones fist, in which you might both see and feel the pulsation.
This immoderate shaking of the Heart comes from the Pulsative Faculty provoked.
But here may be objected, That in Feavers all these things are found, for this is an immoderat•• Systole and Diastole, by the provocation of the Faculty through some troublesom matter, or by en∣crease of heat in the Heart.
To this we answer, That the motion of the Heart in Feavers is distinguished from Palpitation, on∣ly by its degrees, and the depraved motion of the Heart when it is vehement, is called Palpitation; but if it be not vehement, it is called a quick, great, and swift Pulse, and is referred to the difference•• of Pulses.
Now the Efficient Causes of this Palpitation may be referred to Three Heads: Either it is som∣what which troubleth and pricketh; or necessity of Refrigeration; or defect of Spirits: which two latter may be referred to the encrease of Custom.
The Molesting Cause is most usual, so that many Authors knew no other, the other are rare, and that is either a vapor or wind which troubleth the Heart either in quantity or quality, or both. The quality is either manifest or occult▪
A vapor troublesom in a manifest quality, is either in the Heart and its parts adjoyning; or it is sent from other parts; and this suddenly getting to the inmost parts of the Heart, doth stir up the Expul••ive Faculty, which being Naturally very strong, ariseth powerfully with all its force to ex∣pel the enemy.