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Significance of Microembolic Signals during Oxygen Inhalation in Patients with Prosthetic Mechanical Heart Valve  

조수진 (한림대학교 의과대학 신경과)
나찬영 (부천세종병원 흉부외과)
이은일 (고려대학교 의과대학 예방의학과)
민양기 (한림대학교 의과대학 신경과)
권기한 (한림대학교 의과대학 신경과)
이정주 (부천세종병원 신경과)
백만종 (부천세종병원 흉부외과)
오삼세 (부천세종병원 흉부외과)
홍석근 (부천세종병원 심장내과)
Publication Information
Journal of Chest Surgery / v.37, no.1, 2004 , pp. 50-55 More about this Journal
Abstract
Background: Transcranial Doppler ultrasonography (TCD) can detect microembolic signals (MES) in the patients with a potential embolic source. Clinical significance of MES has not been demonstrated in patients with prosthetic mechanical heart valves. We studied the correlation between cerebral thromboemoblic events after the mechanical heart valve surgery (MHVS) and residual MES during TCD monitoring with 100% oxygen inhalation in patients with mechanical heart valves. Material and Method: Twenty patients with previous cerebral thromboemoblic events after MHVS and a sex- and age-matched control group (n=30) were studied. TCD monitoring was performed from unilateral middle cerebral artery. After baseline monitoring for 20 minutes, 61 of oxygen was inspired for 40 minutes. Result: The site of valve and the duration after MHVS of the patients did not differ from those of controls. During baseline monitoring, there was no significant difference in MES prevalence or counts compared to controls. During oxygen inhalation, patients showed a higher MES prevalence (55%, 27.6%, p=0.045) and a more frequent MES counts (p=0.027) compared to controls. Conclusion: TCD monitoring with oxygen inhalation may be useful to differentiate clinically significant MES in patients with mechanical heart valve.
Keywords
Ultrasound; Heart valve prosthesis; Embolism; Oxygen;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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