Systolic and diastolic effects of beta-adrenergic stimulation in normal humans

We conclude that stimulation of β-adrenergic receptors with low-dose isoprenaline exerts greater effects on myocardial relaxation than contraction. This suggests that diastolic function is exquisitely sensitive to acute changes in sympathetic tone, a finding that may have relevance in the pathogenesis and treatment of disease states associated with impaired ventricular filling.