POLYSPHYGMOGRAMS 



289 



the blood escapes into the ventricle, is responsible for the downward 

 slope in the curve from v to y. 



The Cardiogram (tracing of the apex beat). In order to record and 

 interpret the cardiogram, tambours are applied to the apex beat and the 



OF Se*]l(||o,,H. 



A 



**& 



L.NE I 



u *iA 



Fig. 97-A. Superimposed pressure curves from aorta, ventricle and auricle, along with elec- 

 trocardiogram and phonocardiogram. A, aorta; V, ventricle; Aur, auricle; E, electrocardiogram; 

 P, phonocardiogram. 



carotid pulse in similar manner to that already described for the venous 

 tracing. An inspection of the tracings so obtained will reveal the fol- 



