宮沢 総介¹, 鈴木 茂¹, 佐々木 達海¹, 中村 譲¹, 鈴木 和彦¹, 水野 朝敏¹, 新井 達太¹, 吉川 義博², 寺島 昌夫², 望月 剛²

Sosuke MIYAZAWA¹, Shigeru SUZUKI¹, Tatsuumi SASAKI¹, Yuzuru NAKAMURA¹, Kazuhiko SUZUKI¹, Asatoshi MIZUNO¹, Tatsuta ARAI¹, Yoshihiro YOSHIKAWA², Masao TERASHIMA², Takashi MOCHIZUKI²

¹東京慈恵会医科大学心臓外科, ²アロカ株式会社

¹Department of Cardiovascular Surgery, Jikei University School of Medicine, ²Aloka Co., Ltd.

キーワード : High pulse repetition frequency Doppler (HPRF), Continuous wave Doppler

　High pulse repetition frequency (HPRF) Doppler was used to determine the flow velocity of abnormal blood flow in varied heart disease, and the findings were compared with those by continuous wave Doppler. The model SSD-730 by Aloka Co., Ltd. was used in this study, and the reference frequency of this system ranged from 4.2 KHz to 19.2 KHz. Twenty-seven cases of mitral stenosis and 12 cases of semilunar valve stenosis and coarctation of aorta were studied.
　Little differences were noted in all studied cases in terms of the maximum flow velocity between HPRF Doppler and continuous wave Doppler. Pressure gradient obtained by catheterization was compared with that estimated by HPRF Doppler, and good correlations (r=0.74 in MS group; r=0.95 in other diseases) resulted.
　HPRF Doppler that has improved pulse repetition frequency is not only capable of displaying the blood flow signal at a specific region without producing aliasing but also of measuring the flow velocity that has been usually determined only by continuous wave Doppler. This technique appears to serve as a highly useful clinical tool because of its wide diagnostic capabilities.