Doppler

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Doppler echocardiographic assessment of aortic regurgitation: uses and limitations
Allan L. Klein, MD, Malcolm B. Davison, MBBS, Galen Vonk, MD and A. Jamil Tajik, MD

Cleveland Clinic Journal of Medicine July 1992, 59 (4) 359-368;

The final determination of the severity of aortic regurgitation should involve a combination of the various Doppler techniques and the indices derived from them.
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Doppler echocardiographic assessment of constrictive pericarditis, cardiac amyloidosis, and cardiac tamponade
Allan L. Klein, MD and Gerald I. Cohen, MD

Cleveland Clinic Journal of Medicine May 1992, 59 (3) 278-290;

Doppler echocardiography is emerging as an excellent noninvasive way to assess diastolic function, and its array of clinical applications is expanding.