"Thermic applications, general and local, may safely be affirmed to be the true physiological heart tonic. In the employment of the cold pericardial compress as a heart tonic, the application should generally be continued not more than half an hour at a time, and its use may be alternated with general cold applications to the surface. A cold towel rub, or the cold trunk pack is the best form for application if the patient is very feeble.
"The cold towel rub is applied thus: wring a towel as dry as possible out of very cold water, and spread it quickly and evenly over the surface; rub vigorously outside until the skin begins to feel warm; then remove, dry the moistened surface, rub until it glows, and make the same application to another part; and so on until the whole surface of the body has been gone over. The procedure should be rapid and vigorous.
"If the cold trunk pack is employed, a sheet of not more than one thickness should be wrung as dry as possible out of very cold water, and wrapped quickly about the body, after first dipping the hands in water, and rubbing the trunk vigorously. In cases of extreme cardiac weakness, very cold and very hot applications may be alternately applied over the region of the heart. The duration of the hot and cold applications should be about fifteen seconds each.
"Any one who has ever witnessed the marvelous effects of applications of this sort in reviving a flagging heart will never doubt their efficacy, and will have no occasion to resort to alcohol, or any other intoxicant, to stimulate a flagging heart. The writer has employed these measures for stimulating the heart for more than twenty years, and might cite hundreds of instances in which their efficiency has been demonstrated. They are applicable not only to the cardiac depression encountered in the adynamic stage of typhoid and other fevers, but in cases of heart failure from hemorrhage, of surgical shock, collapse under chloroform or ether, opium poisoning,