Introduction We report the case of an 80-year-old woman with syncope and atrial tachycardia (AT) induced by swallowing. Pharmacologic therapy was ineffective, and she underwent catheter ablation of AT originating from the superior vena cava (SVC). Potential mechanisms of swallow-induced syncope including AT and parasympathetic stimulation are discussed. Electroanatomic correlation with the role...

In the isolated, blood-perfused dog atrium, strychnine evoked dose-dependent decreases in atrial rate and contractile force, and the negative cardiac effects were not influenced by atropine. Strychnine suppressed dose-dependently the negative chronotropic and inotropic responses to intramural parasympathetic nerve stimulation, but not the response to acetylcholine. These results suggest that st...

Panic disorder is often associated with the autonomic nervous system pattern - sympathetic activation and parasympathetic (vagal) withdrawal. However, we present one special case here to show a totally reversed pathogenesis - vagal activation occupying the leading role, which requires atropine to cure the patient's symptoms. Through this report, it is reasonably proven that panic disorder may b...

This report describes a 55-year-old woman in whom yellow scorpion sting resulted in the development of Mobitz type 1 and transient complete heart blocks unresponsive to atropine administration.  It might be concluded that although autonomic involvement including parasympathetic overactivity is present in such cases, other factors such as toxic damage to the cardiac conduction system may play a ...