ラディアル・トノメトリー・プレッシャーの数学的変換による中央大動脈の圧力波形の推定. 一般化された転送関数の検証
1Department of Internal Medicine, Johns Hopkins University Medical Institutions, Baltimore, Md, USA.
Circulation
|April 1, 1997
まとめ
中枢大動脈の圧力は,一般化された移転関数 (TF) を使用して,放射動脈の測定から非侵襲的に推定することができます. この方法は,精密な動脈コンプライアンス推定を提供し,心血管評価の貴重なツールです.
科学分野:
- 心血管の生理学 心血管の生理学
- バイオメディカルエンジニアリング
- ヘモダイナミクス (血動力学)
背景:
- 中央大動脈の圧力は,心血管状態の重要な指標ですが,侵襲的な測定が必要です.
- 周辺圧力は,中央圧力とは異なるが,非侵襲的な代替手段を提供している.
- 数学的変換は,周辺の測定から中央圧力を近似することができます.
研究 の 目的:
- 中枢大動脈の圧力を近似した外周圧力の変換の有効性をテストするために.
- これらの変換における主体間および主体内変動性を調べる.
- 単一の平均変換の適用性を評価する.
主な方法:
- 侵襲的中央大動脈圧と非侵襲的放射線圧は,20人の患者で測定されました.
- 圧力間の転移関数 (TF) は,パラメトリックモデルを使用して計算されました.
- 個々のTFを平均して一般化されたTFを作成しました.
主要な成果:
- TFは,幅度 (24.9%) と頻度 (16.9%) で患者間変動を示した.
- 患者内TF変異は,血液動力学的トランジッタ中に患者の28.5%で発生しました.
- 汎用TFは,中心圧 (誤差<3.8mm Hg) と動脈適合 (精度6%) を正確に推定した.
結論:
- 中枢大動脈の圧力は,一般化されたTFを用いた放射性トノメトリーから正確に推定できます.
- 再構築された波形は,動脈の適合性を推定するのに役立ちます.
- 増幅指数は,波形フィデリティ要件のために過小評価される可能性があります.
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