. Medical diagnosis for the student and practitioner. infor-mation as to the progress of the case and the results of medication. It canbe of inestimable value in hospital and house cases where the elaborate andefficient office instruments are not available. When used in this way it veryfrequently gives the first hint that the patient is not doing as well as he isbelieved to be doing and gives the opportunity of changing the existingregime of the patient before any real harm is done, hours or even days beforethe ordinary clinical methods reveal the threatening trouble. THE ELECTROCARDIOGRAPH 51
. Medical diagnosis for the student and practitioner. infor-mation as to the progress of the case and the results of medication. It canbe of inestimable value in hospital and house cases where the elaborate andefficient office instruments are not available. When used in this way it veryfrequently gives the first hint that the patient is not doing as well as he isbelieved to be doing and gives the opportunity of changing the existingregime of the patient before any real harm is done, hours or even days beforethe ordinary clinical methods reveal the threatening trouble. THE ELECTROCARDIOGRAPH 517 THE ELECTROCARDIOGRAPH Basic Principles.—Whenever a portion of muscular tissue takes on activ-ity it becomes electrically negative with relation to the resting portion. The differences of electric potential thus created (electromotive force)can be measured by the string galvanometer when one electrode overliesthe active portion and the other the passive area. Plate/LAdjustabieSlitw ^Cylindrical Lens Time Marker Water Bath Condenser -800Fig. 212. Arc HO _*<_80-— -Essential parts of electrocardiograph, as shown below.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdiagnos, bookyear1922
