Pihritlation in the Mammalian Heart, 9 



In the case of a heart which is showing individual fibrillar beats of the 

 nature already described the process of recovery under the influence of 



A. 



B. 



Fia, 8. — K.V. recorded. Fibrillation from application of faradic current (200 units). 

 A is taken 7 seconds after beginning of fibrillation. B shows recovery occurring 

 after fibrillation had lasted 75 seconds, massage being done at intervals. Adrenaline, 

 0'27 mgrm., had been injected previously, and this i probably favoured recovery. 

 Marked coarsening of the movement (followed by a long pause) is seen prior to 

 recovery. • 



massage, removal of depressing influences, etc., is usually a more elaborate one. 

 The phase of slow coarse fibrillation has to be passed through, with a gradual 

 increase in the rate and the grade of dissociation as excitability is restored ; 

 this leads up to the condition of rapid fine fibrillation — from which recovery 

 occurs in the fashion stated above. But treatment with certain doses of 

 adrenaline, etc., may sometimes change the fibrillar beats into co-ordinated 

 ones without a transition through the various phases just enumerated (fig. 9). 



A. B. 



Fig. 9. — A shows slow coarse fibrillation — a series of irregular fibrillar beats. B is 

 taken shortly after the injection of 0*2 mgrm. adrfenalin into the L.V. (1 in 5000 

 solution used). The fibrillar beats are changed into normal ones. 



( 310 ) . 



