Glaucoma: Diagnosis and Therapy

Re: COV of end-diastolic velocity (259) to Dr. Emi

Janos Nemeth M.D.

To Dr. Kazuo Emi,
Thank you very much for your interest. Yes, we experienced similar difficulty in the definition of the end-diastolic velocity value on the monitor. We might overcome only some sunjective factors when we introduced the automatic detection mode of our ultrasound machine during velocity measurements. Other thing is that if we are measuring with the same absolute error, in case of a small value like the end-diastolic one, the coefficient of variation will be higher than in case of a high value like the systolic velocity. Third thing is that the end-diastolic blood flow velocity in the very small orbital vessels is really very slow and this velocity is close to the sensitivity limit of the ultrasound measurement.
Janos Nemeth M.D.

On Thu Dec 10, Kazuo Emi wrote
>To Janos Nemeth MD
>How have you been!

>Thank you for the challenging research. The CV-value of our data also indicates
>that of the endo-diastolic velocity is the biggest in intra-observer. In my
>opinion, compared with the PSV, EDV is more difficult to decide the value on the
>monitor screen because the peak of the power spectrum of the EDV is unclear in
>many cases. Do you have any comment?

>Kazuo Emi MD

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