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Ann Thorac Surg 1995;59:74-77
© 1995 The Society of Thoracic Surgeons

Articles

Optimizing "delay period" for burst stimulation in dynamic cardiomyoplasty

MD Joe Helou, MD Yoshio Misawa, MD James A. Stewart, MS Michael Colson, MD, Phd Ray C.-J. Chiu*

Division of Cardiovascular and Thoracic Surgery and Division of Cardiology, McGill University, Montreal, Quebec, Canada; and Medtronic, Inc, Minneapolis, Minnesota, USA

Accepted for publication June 23, 1994.

* Address reprint requests to Dr Chiu, The Montreal General Hospital, 1650 Cedar Ave, Room C9.169, Montreal, Quebec, Canada, H3G 1A4.

Hemodynamic evidence of systolic assist after dynamic cardiomyoplasty remains inconsistent. One of the relevant factors may be how the burst stimulator is programmed. In 3 patients who underwent cardiomyoplasty for idiopathic dilated cardiomyopathy, we examined the modes used to determine the delay period between the R-wave sensing and the onset of burst stimulation during cardiac systole. These modes include the fixed time mode, the valve-synchronized mode, and the flowoptimized mode. The rationale for choosing these modes and the benefits conferred by each are discussed.




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