Key result
L-NAME significantly reduced bradycardia induced by vagal stimulation in anaesthetized ferrets, an effect reversed by L-arginine, suggesting nitric oxide modulates vagal heart rate control.
Why the study?
Does nitric oxide synthase inhibition modulate vagally induced bradycardia in anaesthetized ferrets?
Does nitric oxide synthase inhibition modulate vagally induced bradycardia in anaesthetized ferrets?
Nitric oxide appears to play a significant role in modulating the vagally mediated control of heart rate in an animal model.
Answers are grounded in this paper and cite their sources.
Hypothesis-generating in ferrets; leaves open relevance to human vagal heart rate control and any therapeutic targeting.
We have examined a possible role for nitric oxide in the efferent vagal control of heart rate of the anaesthetized ferret, using stimulation of the motor fibres of the right vagus at supramaximal intensities and increasing frequencies. Propranolol was used to block beta-adrenergic actions on the heart. L-NAME (50-100 mg i.v.) significantly reduced the bradycardia induced by vagal stimulation at all frequencies tested (1-15 Hz); subsequent infusion of L-arginine (100-200 mg i.v.) restored the vagally induced heart rate responses to control levels. These results strongly suggest a role for nitric oxide in modulating the vagally mediated control of heart rate.
No takes yet. Share an insight, caveat, or question.
Conlon et al. (1996) studied this question. L-NAME vs. Control levels (baseline) was evaluated on Bradycardia induced by vagal stimulation. L-NAME significantly reduced bradycardia induced by vagal stimulation in anaesthetized ferrets, an effect reversed by L-arginine, suggesting nitric oxide modulates vagal heart rate control.
Synapse has enriched 10 related papers. Consider them for comparative context: