634 
PHYSIOLOGY 
CONTROL 
HR/min 
-171 
DLNP/DT sec^ 
-116- 
-H- 
T 
-116 + 
DP/DT 
-37334- 
-3733- 
A P mm hff 
-153 ^ 
mm hg / sec 
LVP mm her 
-160 ^ 
LAP mm hg 
-28.6 ^ 
LVID cm 
-5.7 
-2,7 
LAEG 
JJ M LL- 
01 
IL. 
Ul 
Figure 2. — Typical recording from a conscious instrumented dog 45 days after surgery for implanting transducing 
devices. HR = heart rate, d InP/dt = the first derivative of the natural logarithm of the left ventricular 
pressure; dP/dt = first derivative of the left ventricular pressure; AP = central aortic pressure; LVP = 
left ventricular pressure; LAP = left atrial pressure; LVID = left ventricular internal diameter; LAEG = 
left atrial electrogram. 
