Electrocardiographic criteria for vagotonia-validation with pharmacological parasympathetic blockade in healthy subjects.

Reversal of Electrocardiographic Sodium Channel Blockade Changes with Bicarbonate Therapy in a Pediatric Patient Post-Cardiopulmonary Arrest Secondary to Methadone Toxicity

Clinical and Electrocardiographic comparison of patients with primary Mitral Valve Prolapse Syndrome and control group

ABSTRACT: Mitral Valve Prolapse (WVP) in one of the commonest cardiac abnormalities. Echocardiography has generally been accepted as the diagnostic modality of choice, To assess the characteristic symptoms signs and electrocardiographic abnormalities of MVP results of prospective 500 age and sex matched healthy subjects without echocardiographic MVP (control subjects). The diagnostic criteria...

Cardiac sympathetic blockade during spinal anesthesia involves both efferent and afferent pathways.

To the Editor-We would like to thank Drs. Thnish and Downs for their interesting case report, “Vagotonia and Cardiac Arrest during Spinal Anesthesia.”’ These authors discuss the contribution of sympathetic and parasympathetic nervous system imbalance during spinal anesthesia as a mechanism of asystole. They state that in a patient with vasovagal syncope, the combination of cardiac sympathetic b...

Ethical issues on informed consent and recruitment for clinical trials.

In Rep.ply:-I would like to thank Ilrs. Introna and Blair for making several interesting comments regarding the reported case of vagotonia and cardiac arrest during a spind anesthetic. I agree that in most individuals the sympathetic and parasympathetic systems remains remarkably balanced, despite significant blockade of the sympathetic afferent and efferent pathways during spinal anesthesia. O...

Sympathetic and parasympathetic innervation of pupillary dilation during sustained processing.

The contributions of separate sympathetic and parasympathetic pathways to pupillary dilation during a sustained processing task were studied through environmental and pharmacological manipulations. In Experiment 1, 22 healthy volunteers (11 female) performed a serial Subtract 7 task while pupil diameter was recorded both during moderate room light and in darkness. In a control for verbalization...