increasing the afterload on the non-working preparations in a stepwise fashion from 75 cm h2o to 120 cm h2o caused significant changes in left ventricular pressure and dp/dtmax in both heart types but the tachycardia in the hyperthyroid hearts persisted ( at 120 cm h2o ; hyperthyroid , 294 +/- 9 beats/min ; euthyroid , 224 +/- 10 beats/min ; p less than 0.001 ) .
C0225897
left ventricular
C0018787
hearts