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Ann Thorac Surg 1992;54:502-506
© 1992 The Society of Thoracic Surgeons

Articles

Human cardiac nerve stimulation

David A. Murphy, MD*, J.Andrew Armour, MD, PhD

Departments of Surgery, Physiology, and Biophysics, Faculty of Medicine, Dalhousie University, Halifax, Nova Scotia, Canada

Accepted for publication January 14, 1992.

* Address reprint requests to Dr Murphy, Victoria General Hospital, Suite 3067, Dickson Center, Halifax, Nova Scotia, B3H 2Y9, Canada.

Cardiovascular responses were elicited in 12 patients undergoing cardiac operations when cardiopulmonary neural elements between the aortic root and pulmonary artery or in the right atrial ganglionated plexus were stimulated. Heart rate and left ventricular intramyocardial systolic pressure were augmented when cardiopulmonary nerves between the aorta and pulmonary artery were stimulated in 11 of the 12 patients. Right ventricular intramyocardial systolic pressure was augmented in 7 of these 11 patients. Cardiodepressor responses were elicited when the right atrial ganglionated plexus (9 patients) or a cardiopulmonary nerve (2 patients) was stimulated. These results demonstrate that electrical stimulation of the human extrinsic and intrinsic cardiac nervous systems can alter cardiodynamics, different responses being elicited when different neural structures are stimulated. These data are in accord with those obtained from canine experiments and suggest that the human extrinsic and intrinsic cardiac nervous system contains functionally similar neural elements to those found in other mammals.




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