人工心肺におけるＴＣＤによるＨｉｇｈ‐ｉｎｔｅｎｓｉｔｙ　Ｔｒａｎｓｉｅｎｔ　Ｓｉｇｎａｌｓ（ＨＩＴＳ）の周波数分析の臨床的意義について

• 榛沢 和彦

  新潟大学第二外科

書誌事項

タイトル別名

• Clinical Significance of Frequency Analysis of High-intensity Transient Signals(HITS) by TCD in Cardiopulmonary Bypass.

抄録

Purpose: High-intensity transient signals (HITS) are commonly detected during cardiopulmonary bypass (CPB) . However, the clinical significance of HITS during CPB is still controversial. Micro-bubbles are reported to produce HITS of more than 400-500 Hz. We attempted to elucidate the incidence of HITS exceeding 400 Hz during CPB. Methods: The subjects were 6 patients who underwent open heart surgery using CPB. HITS were detected by TC2020, PIONEER (Nicolet /EME) with a 2.0-MHz pulsed Doppler probe at the middle cerebral artery. Transesophageal echocardiography (TEE) was undertaken during the operation. Results: The total number of HITS during CPB was 1707±1392 (n=6) . Of the total HITS, 88.1±6.8% had a frequency of more than 400 Hz. On the other hand, HITS of less than 400 Hz were frequently detected at aortic cannulation, aortic decannulation and aortic cross-clamping. HITS of more than 400 Hz were detected in cases showing cardiac or aortic micro-bubbles in TEE. Conclusion: The present findings suggest that the majority of HITS during CPB reflect micro-bubbles, and that aortic manipulation may be related to the formation of solid micro-emboli. HITS frequency analysis may be useful for differentiating between micro-bubbles and solid micro-emboli formed during CPB.

収録刊行物

• Neurosonology:神経超音波医学

  Neurosonology:神経超音波医学 12 (2), 64-70, 1999

  一般社団法人日本脳神経超音波学会

キーワード

• cardiopulmonary bypass
• high-intensity transient signals
• frequency analysis

詳細情報

• CRID: 1390001204419822208
• NII論文ID: 10027071617
• NII書誌ID: AN10236361
• DOI: 10.2301/neurosonology.12.64
• ISSN: 18843336
• ISSN: 0917074X
• ISSN: http://id.crossref.org/issn/0917074X
• Web Site: https://search.jamas.or.jp/link/ui/2000087438
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可