F. KRAFT-HUNTER AND E. W. HAWTHORNE 
635 
ATRIAL PACING 
M|HHI|IMI)|II|IIIMINMIMIIIMIIMHIIM»IIMIMII]IIIIIIIMIMMIMIIIIIIMIIIIII 
' llllti| | |lt||i|MH"i"M'MI""MMiiiiiiinM'l'IM'l'""""l""i"i"""i»'i"i""ll""""l"IMIIIIMMMIIIMMIIIIIII millllllllllllllllllllllMIIIIIIIIIIIIIMIIIHIIIIIIIIIHIIIIIIIIIUIIIMim.' 
HR/min 
-180 
-30 
DLNP/DT sec'^ 
LVEG 
1 
ilPi > 
in ml 
Figure 3. — Effects of atrial pacing, using bipolar stimulation, at different frequencies. LVEG = left ventricular 
electrogram. Other labels are the same as used in Figure 2. 
