Abstract:
OBJECTIVE:Intraoperative monitoring of myogenic motor evoked potentials to transcranial electrical stimulation (tc MEPs) is a new method to assess the integrity of the motor pathways. The authors studied the effects of 50% nitrous oxide (N2O) and a low-dose propofol infusion on tc MEPs paired electrical stimulation during fentanyl anesthesia with partial neuromuscular blockade. DESIGN:Cross-over study. SETTING:St Antonius Hospital, Nieuwegein, The Netherlands. PARTICIPANTS:Ten patients scheduled to undergo surgery on the thoracoabdominal aorta were studied; 6 women aged 54 to 69 years and 4 men aged 68 to 77 years. INTERVENTIONS:After achieving a stable anesthetic state and before surgery, tc MEPs were recorded during four 15-minute periods: (I) air/oxygen (O2; F(I)O2 = 50%); propofol target blood concentration, 0.5 microg/mL; (II) N2O/O2 (F(I)O2 = 50%); propofol target blood concentration, 0.5 microg/mL; (III) N2O/O2 (F(I)O2 = 50%; propofol target blood concentration, 1.0 microg/mL; and (IV) air/O2 (F(I)O2 = 50%); propofol target blood concentration, 1.0 microg/mL. MEASUREMENTS AND MAIN RESULTS:Tc MEPs were recorded from the right extensor digitorum communis muscle and the right tibialis anterior muscle. The right thenar muscle was used for recording the level of relaxation; the T1 response was maintained at 40% to 70% of the control compound muscle action potential. There was no significant difference in onset latency among the four phases. The addition of N2O and doubling the target propofol infusion to 1.0 microg/mL resulted in a 40% to 50% reduction of tc MEP amplitude recorded in the extensor digitorum communis muscle and tibialis anterior muscle (p < 0.01). During each phase, tc MEPs could be elicited and interpreted, except in one patient, in whom no tc MEPs could be elicited in the leg because of technical problems. CONCLUSION:The data indicate that tc MEP monitoring is feasible during low-dose propofol, fentanyl/50% N2O in 02 anesthesia and partial neuromuscular blockade.
journal_name
J Cardiothorac Vasc Anesthjournal_title
Journal of cardiothoracic and vascular anesthesiaauthors
van Dongen EP,ter Beek HT,Schepens MA,Morshuis WJ,Langemeijer HJ,Kalkman CJ,Boezeman EHdoi
10.1016/s1053-0770(99)90169-6keywords:
subject
Has Abstractpub_date
1999-02-01 00:00:00pages
30-4issue
1eissn
1053-0770issn
1532-8422pii
S1053-0770(99)90169-6journal_volume
13pub_type
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journal_title:Journal of cardiothoracic and vascular anesthesia
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abstract:OBJECTIVE:Auditory information presented during anesthesia can activate memory. Surgical stimulation may enhance memory formation. The authors' hypothesis is that implicit memory processing is not preserved during unconsciousness, even in the presence of a surgical stimulus. DESIGN:A double-blind randomized controlled...
journal_title:Journal of cardiothoracic and vascular anesthesia
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abstract:OBJECTIVE:Postcardiopulmonary bypass hemorrhage remains a serious complication of cardiac surgery. Given concerns regarding adverse effects of blood product transfusion and limited efficacy of current antifibrinolytics, procoagulant medications, including recombinant factor VIIa (rFVIIa) and factor eight inhibitor bypa...
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abstract::In the UK, mortality rate during pregnancy/in the peripartal period is 14.1 per 100,000 maternities with heart disease being the leading cause of non-obstetric maternal mortality (10% to 15% of all maternal deaths). Owing to the advances in the treatment of congenital heart disease (CHD), an increasing percentage of w...
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abstract:OBJECTIVE:Controversial results exist on the effects of spinal analgesia in cardiac surgery. The authors conducted a review of randomized studies to show whether there are any advantages in clinically relevant outcomes using spinal analgesia in patients undergoing cardiac surgery. DESIGN:Meta-analysis. SETTING:Multip...
journal_title:Journal of cardiothoracic and vascular anesthesia
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abstract:OBJECTIVES:To test the hypothesis that the hemodynamic and left ventricular functional actions of levosimendan (Orion Pharmaceutica, Espoo, Finland), a new myofilament calcium sensitizer with phosphodiesterase-inhibiting properties, in conscious dogs are correlated with plasma concentrations of the drug measured with r...
journal_title:Journal of cardiothoracic and vascular anesthesia
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doi:10.1016/s1053-0770(97)90252-4
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abstract:OBJECTIVE:To assess whether or not a positive fluid balance masks acute kidney injury (AKI) and is associated with adverse outcomes after cardiac surgery. DESIGN:Retrospective analysis. SETTING:Tertiary university-affiliated metropolitan hospital: single center. PARTICIPANTS:Three thousand two hundred seven consecut...
journal_title:Journal of cardiothoracic and vascular anesthesia
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journal_title:Journal of cardiothoracic and vascular anesthesia
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更新日期:2004-08-01 00:00:00
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更新日期:2008-08-01 00:00:00
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journal_title:Journal of cardiothoracic and vascular anesthesia
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更新日期:1994-04-01 00:00:00