Abstract
Summary
(1) Nodal rhythm, ventricular extrasystoles, flutter and fibrillation were precipitated by norepinephrine in cats, under pentobarbital anesthesia, treated with harman methosulfate. Migration of the T-wave into the R-wave at onset of ventricular fibrillation was similar to that described before epinephrine induced arrhythmias. (2) The effects of norepinephrine on cardiac excitability were confirmed using isolated papillary muscles in which norepinephrine had a greater potency than epinephrine in eliciting automatic contractile activity.
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