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J Thorac Cardiovasc Surg 1997;113:87-101
© 1997 Mosby, Inc.
SURGERY FOR ACQUIRED HEART DISEASE |
Received for publication April 30, 1996 Revisions requested June 10, 1996 Revisions received July 1, 1996; Accepted for publication July 8, 1996 Address for reprints: P. de Haan, MD, Department of Anesthesiology, Academic Hospital, University of Amsterdam, Academic Medical Center, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands.
Abstract
Objective: Motor-evoked myogenic potentials after transcranial electrical stimulation monitor the vulnerable motoneuronal system of the spinal cord. This study reports our initial experiences with motor-evoked potentials to assess the adequacy of spinal cord perfusion during operations for thoracoabdominal aneurysms. Methods: In 20 patients undergoing thoracoabdominal aneurysm operations, myogenic motor-evoked potentials were recorded. In 18 patients retrograde aortic perfusion was used. When spinal cord ischemia was detected, distal flow or mean arterial pressure was increased in an attempt to restore cord perfusion. By means of sequential crossclamping, motor-evoked potentials were also used to identify intercostal or lumbar arteries that needed to be reimplanted. Results: Reproducible motor-evoked potentials could be recorded in all patients. During retrograde perfusion, nine patients showed a rapid decrease in the amplitude of motor-evoked potentials to less than 25% of baseline, indicating spinal cord ischemia. In five patients ischemic changes in motor-evoked potentials could be reversed by increasing distal and proximal blood pressures. In four patients ischemic changes during crossclamping necessitated segmental artery reimplantation. In three of these four patients intercostal or lumbar arteries were reattached. In one patient reimplantation of segmental arteries was not possible; this patient awoke paraplegic. Segmental arteries were ligated after confirmation of intact motor-evoked potentials during aortic clamping in eight patients. None of these patients had a neurologic deficit. The absence of motor-evoked potentials at the end of the procedure always indicated a postoperative motor deficit. Conclusion: During operations for thoracoabdominal aneurysms, monitoring of motor-evoked potentials is an effective technique to detect spinal cord ischemia within minutes. This modality can be used to guide the management of distal aortic perfusion techniques and may also help to identify segmental arteries that need to be reattached.
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