The accompanying illustrations show a new cardioscope which is useful in detecting any changes which may take place in the heart action during administration of chloroform or ether.
The disc or phonendoscope is small and flat with a metal tube protruding from one side to which is attached a long firm rubber tube divided by a Y at its distal end to connect with the rubber tubes which hold the small ear pieces. The disc is placed directly over that portion of the chest wall where the heart sounds are most distinctly heard and it is held firmly to the skin with a wide strip of adhesive plaster.
The rubber tubing passes backward under the clothing and up to the ears of the anesthetist. The anesthetist at any time can count the pulsations of the heart and at the same time have his two hands free to attend to his
ROBERTSON AW. A NEW CARDIOSCOPE TO BE USED WHILE ADMINISTERING CHLOROFORM OR ETHER. JAMA. 1909;LII(13):1034. doi:10.1001/jama.1909.25420390030002d
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