49 
» systole, namely, is lengthened, so that at the 
moment when the stimulus is applied 
the postcompensatory 
and consequently 
, the ventricle is still refractory 
The auricles, however, 
auriculoventricular boundary, so 
traverses the auricles in retrograde 
xtrasystole. 
stimulus at the 
no e 
presents 
do respond to the 
excitation 
ie) 
of 
E 
an 
GENNER NENDE DEET 
FNS EML RY AAU a UNA 
that consequently 
