using pregnant wistar rats a comparative study was carried out , which was aimed to investigate the effect of long-term tocolysis ( second half of gestation ) with fenoterol alone as well as in combination with the cardioselective beta-blocker metoprolol ( beloc ) upon the level of beta-adrenoceptor stimulation in maternal pulmonal , myocardial and myometrial tissue and in the myocardium of the fetuses .
C0032961
gestation
C0025859
metoprolol