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J Thorac Cardiovasc Surg 2003;126:1638-1639
© 2003 The American Association for Thoracic Surgery

Brief communications

Doppler microembolic signals during cardiac surgery: Comparison between arterial line and middle cerebral artery

^a Department of Neurology, Martin-Luther University of Halle-Wittenberg, Halle/Saale, Germany,
^b Department of Neurology, University of Zürich, Zurich, Switzerland,
^c Department of Cardio-Thoracic Surgery, University of Basel, Basel, Switzerland.

Received for publication November 7, 2002; revisions received February 10, 2003; revisions received April 15, 2003; accepted for publication April 21, 2003.

^* Address for reprints: Dimitrios Georgiadis, MD, Department of Neurology, University of Zürich, Frauenklinikstrasse 26, CH-8091 Zürich, Switzerland
Dimitrios.Georgiadis@usz.ch

The first 20% of the full text of this article appears below.

Several studies have demonstrated that the counts of Doppler microembolic signals (MESs) detected during cardiac surgery are related to (1) outcome and length of hospital stay,¹ (2) degree of postoperative neuropsychologic deficit,² and (3) incidence of new ischemic lesions on magnetic resonance imaging of the brain.³ Extracorporeal oxygenation causes varying amounts of air to be diluted in the blood; this air is only partially removed by the arterial filters that are routinely used. We undertook this study to evaluate (1) the percentage of MES reduction caused by the arterial filter and (2) the proportion of MESs actually reaching the brain, by comparing the MES counts detected before the arterial filter, after the arterial filer and in both middle cerebral arteries (MCAs).

Patients and methods

Eleven patients, 7 men and 4 women aged 59 ± 18 years, were monitored during elective cardiac surgery (coronary artery bypass grafting n = 9, valve replacement n = 2). Anesthesia was induced by fentanyl . . . [Full Text of this Article]

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