CARDIOGRAPHIC TRACINGS 



153 



onous drugs the dose must be given much more accurately. 

 How does this first dose affect the heart tracing? Increase 

 the dose and secure marked effects from the heart. Ob- 

 serve the appearance of the organ while the drug is acting. 

 The respiratory movements of the lungs may disturb your 

 cardiac apparatus and show notches at the top and bottom 

 of your heart tracing. To check this reduce the respira- 

 tory movements as much as possible by shutting down the 

 amount of air blown into the lungs. Note carefully any 



Right bowl 



Fig. 145. Special heart holder to keep the heart from moving with the lungs as 

 they contract and expand from the artificial respiration. 



effect this may have on blood-pressure. Watch your 

 anesthesia carefully and do not give too much ether. Make 

 one injection (y 2 c.c. for a dog, 140.0. for a cat) of adrena- 

 line and obtain a tracing showing the action of this drug 

 on the heart. 



2. Now obtain tracings showing the action of whiskey, 

 brandy and wine. Can you use beer or champagne for in- 

 travenous injections? On what do you base your conclu- 

 sions? Record the rectal temperature again and com- 



