The Development of Real-Time Two-Dimensional Doppler Echocardiography and Its Clinical Significance in Acquired Valvular Diseases : With Special Reference to the Evaluation of Valvular Regurgitation

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概要

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• A noninvasive method for real time blood-flow imaging using ultrasound has long been required in the fields of cardiology, and cardiovascular surgery. Recently, we developed a method of two-dimensional Doppler echocardiography (hereafter abbreviated as "2-D Doppler") for clinical use which allows us to obtain noninvasively, intracardiac blood-flow images in real time. The main purpose of this paper is to describe the newly developed blood-flow imaging system "2-D Doppler" and to demonstrate its clinical usefulness in acquired valvular diseases, particularly in the evaluation of valvular regurgitation.The device, in principle, combines a conventional pulsed-Doppler system and a newly developed auto-correlator, in which blood-flow images within a given cross section of a beating heart are noninvasively displayed in real time, simultaneously with conventional two-dimensional echocardiograms. The system can provide three kinds of information, direction, velocity and turbulence of blood flow.The 2-D Doppler examinations were carried out on 72 patients with acquired valvular diseases whose diagnoses were confirmed by angiography and/or surgery. Studies were performed comparing the findings of the 2-D Doppler and those of angiography (for aortic and mitral lesions) or with operative findings (for tricuspid lesions) in the quantitative evaluation of valvular regurgitation. Aortic, mitral and tricuspid valvular regurgitation have been quantitatively demonstrated with 2-D Doppler, and, for each value, the severity of the regurgitation showed a high correlation between the findings of 2-D Doppler and of angiography or surgery. In conclusion, we have found that (1) 2-D Doppler is very useful in detecting and estimating the severity of valvular regurgitation, and that (2) 2-D Doppler may replace conventional angiography in some situations.

著者

• Asano Haruhiko

  First Department Of Internal Medicine Nagoya University School Of Medicine

• Kyo Shunei

  First Department Of Surgery Saitama Medical School

• Koyano Akira

  Aloka Co.

• Kasai Chihiro

  Aloka Co .ltd.

• Namekawa Koroku

  Aloka Co.

• Yokote Yuji

  First Department of Surgery, Saitama Medical School

• Omoto Ryozo

  First Department of Surgery, Saitama Medical School

• Takamoto Shinichi

  First Department of Surgery, Saitama Medical School

• KONDO Yuji

  ALOKA Co. Ltd.

• KYO Shunei

  First Department of Surgery, Saitama Medical School

• KONDO Yuji

  Aloka Co., Ltd.

• KOYANO Akira

  Aloka Co., Ltd.

• UEDA Keisuke

  First Department of Surgery, Saitama Medical School

• YOKOTE Yuji

  First Department of Internal Medicine, Hiroshima University School of Medicine

• ASANO Haruhiko

  First Department of Surgery, Saitama Medical School

• NAMEKAWA Koroku

  Aloka Co., Ltd.

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