CARDIOMETER TRACINGS 



111 



Stimulate one vagus nerve and see how this affects the 

 tracings. Allow the heart to recover and take two inches 

 more of "normal" tracing. Now crowd on the ether and 

 note the effect on the pressure and cardiometer tracings. 

 What does the cardiometer tracing show with respect to 

 the heart? Be sure you describe this fully and correctly 

 in your notes. 



Faucet from 

 artificial 

 resp/'rafro/) Ha^d 

 machine 



Fig. 107. Method of applying the cardiometer over the ventricles. Artificial respi- 

 ration is carried on either with a hand bellows or by an artificial respiration machine. 

 The ether bottle has a by-pass so the amount of anesthetic can be regulated. The excess 

 air escapes through the tube in the straight end of the tracheal cannula which is regu- 

 lated by the screw clamp to give the desired amount of expansion and exhaustion of the 

 lungs. 



Allow the animal to recover and then give it some chloro- 

 form. How does this compare with ether? Now inject 

 one-half cubic centimeter of adrenaline. Plow does this 

 affect the heart? Is the drum going fast enough to show 

 the individual heart heats? 



Allow the animal to return to normal and then give it 



