in order to determine the effect of thyroid status on ventricular growth characteristics and beta-adrenergic receptors , animals were rendered : ( 1 ) hypothyroid with propylthiouracil ( ptu ) , ( 2 ) euthyroid with ptu and daily thyroxine ( t4 ) replacement , ( 3 ) hyperthyroid for several days with daily thyroxine injections or ( 4 ) normal controls with sham saline injections .
C0020676
hypothyroid
C0040165
thyroxine