the cardiovascular effects of levocarnitine chloride ( lc-80 ) were investigated in in vitro and in vivo experiments , and the following results were obtained : ( 1 ) in isolated rabbit cardiac muscle preparations , lc-80 at the high concentration of 10 ( -2 ) m had little influence on the atrial rate of spontaneously beating right atria , while it caused a gradual increase in the contractile tension of both spontaneously beating right atria and electrically driven papillary muscle that reached a maximum level after 10 min of administration and lasted for 20-30 min .
C0027061
cardiac muscle
C0030352
papillary muscle