超音波連続波ドプラー法による僧帽弁位および大動脈弁位置換弁の弁開放能の評価 チョウオンパ レンゾクハ ドプラーホウ ニヨル ソウボウ ベンイ オヨビ ダイドウミャク ベンイ チカンベン ノ ベン カイホウノウ ノ ヒョウカ Continuous wave Doppler echocardiographic assessment of prosthetic valves in the mitral and aortic position

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著者

    • 木佐貫, 彰 キサヌキ, アキラ

書誌事項

タイトル

超音波連続波ドプラー法による僧帽弁位および大動脈弁位置換弁の弁開放能の評価

タイトル別名

チョウオンパ レンゾクハ ドプラーホウ ニヨル ソウボウ ベンイ オヨビ ダイドウミャク ベンイ チカンベン ノ ベン カイホウノウ ノ ヒョウカ

タイトル別名

Continuous wave Doppler echocardiographic assessment of prosthetic valves in the mitral and aortic position

著者名

木佐貫, 彰

著者別名

キサヌキ, アキラ

学位授与大学

鹿児島大学

取得学位

医学博士

学位授与番号

乙第884号

学位授与年月日

1991-03-04

注記・抄録

博士論文

Noninvasive evaluation of the prosthetic valve function remains a clinical challenge. Earlier noninvasive technlques were of limited success because of their inability to provide hemodynamic inforrnation. However, recently developed continuous wave Doppler echocardiography has enabled us to determine transvalvular pressure gradients. We evaluated the prosthetic valve opening function in the mitral and aortic position using continuous wave Doppler echocardiography. I: Prosthetic mitral valve. To evaluate the opening function of prosthetic valves in the mitral position, the mitral flow velocity pattern was recorded with continuous wave Doppler echocardiography in 55 patients with prosthetic mitral valves (34 patients with St. Jude Medical and 21 with porcine xenograft valves). Twenty patients with mitral stenosis and 15 normal subjects were served as controls. An ultrasonic transducer was placed over the left ventricular apex and the direction of the ultrasonic beam was positioned to be parallel with the mitral flow using the Doppler audio-signals. A pressure gradient was calculated form the peak flow velocity with a simplified Bernoulli equation. The peak flow velocity, the pressure half time and the peak and mean pressure gradients were measured to evaluate the opening function of the prosthetic valves. The results were as follows; 1. The values of the peak flow velocity, the pressure half time, the peak and mean pressure gradients in patients with St. Jude Medical valves (1.4±0.3 m/sec, 90±20 mesc, 7.9±2.8 mmHg and 3.5±1.1 mmHg, respectively) and in patients with porcine xenograft valves (1.6±0.3 m/sec, 130±40 msec, 11.2±4.0 mmHg and 4.8±2.1 mmHg, respectively) were significantlylarger than those in normal subjects (0.8±0.1 m/sec, 70±10 msec, 2.8±0.8 mmHg and 1.2±0.4 mmHg, respectively) (P<0.01 or P<0.001), but significantly smaller than those in patients with mitral stenosis (1.9±0.3 m/sec, 240±70 msec, 14.6±4.6 mmHg and 8.2±3.8 mmHg, respectively) (P<0.02, P< 0.01 or P<0.001). All measurements of the 4 indices in patients with the St. Jude Medical valves were significantly smaller than those in patients with the porcine xenograft valves (P<0.01). 2. The changes in the 4 indices related to the valvular size were small in patients with St. Jude Medical and porcune xenograft valves. 3. The correlation between the peak flow velocity (Y_1), the peak pressure gradient (Y_2) and the mean pressure gradient (Y_3) and the years after the valve replacement (X) in patients with porcine xenograft valves demonstrated a significant relationship (Y_1=0.1X+1.4, r=0.62, P<0.01; Y_2=0.7X+7.8, r=0.60, P<0.01 and Y_3=0.3X+3.3, r=0.50, P<0.01, respectively).

II: Prosthetic aortic valve. To evaluate the opening function of prosthetic valves in the aortic position, the aortic flow velocity pattern was obtained with continuous wave Doppler echocardiography in 40 patients with prosthetic aortic valves (21 patients with Björk-Shiley valves, 12 patients with St. Jude Medical valves and 7 patients with Carpentier-Edwards valves) and in 25 normal subjects. The peak flow velocity across the aortic valve was recorded from the left ventricular apex, the suprasternal notch and the right parasternal border in the second intercostal space. The highest value was judged to be the peak flow velocity in each patient. The peak and mean pressure gradients were measured from the peak flow velocity with a simplified Bernoulli equation. The results were as follows; 1. The values of the peak flow velocity, the peak and mean pressure gradient in patients with Björk-Shiley valves (2.5±0.6 m/sec, 26±12 mmHg and 14±6 mmHg, respectively), in patients with St. Jude Medical valves (2.7±0.4 m/sec, 30±9 mmHg and 16±5 mmHg, respectively) and in patients with Carpentier-Edwards valves (2.7±0.7 m/sec, 31±15 mmHg and 18±9 mmHg, respectively) were significantly larger than those in normal subjects (1.1±0.2 m/sec, 5±2 mmHg and 3±1 mmHg, respectively) (P<0.001). But there were no significant differences of the values among the 3 groups of prosthetic valve. 2. The correlation between the peak flow velocity (Y_1), the peak (Y_2) and mean (Y_3) pressure gradients and the valvular size (X) in patients with Björk-Shiley valves demonstrated a significant inverse relationship (Y_1=-0.4X+3.5, r=-0.62, P<0.01; Y_2=-6.8X+45.9, r=-0.60, P<0.01 and Y_3=-4.1X+25.7, r=-0.65, P<0.01, respectively). 3. All 3 indices did not change significantly within 2 years after the first examination in patients with prosthetic valves. In conclusion, continuous wave Doppler echocardiography is a useful noninvasive method for the quantitative assessment of the opening function of the prosthetic valves in the mitral and aortic position.

医歯学総合研究科博士論文(医学) ; 学位取得日: 平成3年3月4日

目次

  1. 目次 / p286 (0003.jp2)
  2. 緒論 / p287 (0003.jp2)
  3. I 僧帽弁位置換弁における検討 / p287 (0003.jp2)
  4. 1.緒言 / p287 (0003.jp2)
  5. 2.対象および方法 / p287 (0003.jp2)
  6. 3.結果 / p288 (0004.jp2)
  7. 4.考案 / p294 (0007.jp2)
  8. II 大動脈弁位置換弁における検討 / p296 (0008.jp2)
  9. 1.緒言 / p296 (0008.jp2)
  10. 2.対象および方法 / p296 (0008.jp2)
  11. 3.結果 / p296 (0008.jp2)
  12. 4.考案 / p299 (0009.jp2)
  13. 総括 / p302 (0011.jp2)
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各種コード

  • NII論文ID(NAID)
    500000083765
  • NII著者ID(NRID)
    • 8000000083975
  • DOI(NDL)
  • 本文言語コード
    • jpn
  • NDL書誌ID
    • 000000248079
  • データ提供元
    • 機関リポジトリ
    • NDL-OPAC
    • NDLデジタルコレクション
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