ECG - QU

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MumaPadurii
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ECG - QU

Postby MumaPadurii » Mon May 19, 2014 11:58 am

Buna ziua,

Exista vreun student/rezident/specialist care imi poate spune valorile de normalitate ale intervalului QU pe ECG? Sau unde sa le caut rapid.
Multumesc.
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gaurav_singh_md
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Re: ECG - QU

Postby gaurav_singh_md » Thu May 22, 2014 9:49 pm

The interval from the end of T to the apex of U was practically independent of the heart rate and sex; it averaged 0.10 second. The Q-aU interval expected for a certain heart rate can be easily determined, therefore, by adding 0.10 second to the Q-T interval expected for this rate. The interval from the apex to the end of U was influenced by the heart rate more than any other interval, but as the determination of the end of U especially at high heart rates was difficult, this observation should be interpreted with caution.
(The duration of the Q-U interval and its components in electrocardiograms of normal persons; Eugene Lepeschkin, M.D., Borys Surawicz, M.D.; American Heart Journal Volume 46, Issue 1, July 1953, Pages 9–20)

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MumaPadurii
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Re: ECG - QU

Postby MumaPadurii » Thu May 22, 2014 9:53 pm

aha, mersi
doar ca nu e vorba de persoane normale si nici de Q-aU, ci de QU
Ma intereseaza daca exista un interval de normalitate pt QU corectat cu frecventa, evident
cum exista pt QT corectat
Muma the Puma

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Re: ECG - QU

Postby gaurav_singh_md » Mon May 26, 2014 2:40 am

Pérez Riera AR, Ferreira C, Filho CF, et al. (2008). "The enigmatic sixth wave of the electrocardiogram: the U wave". Cardiol J 15 (5): 408–21. PMID: 18810715

This review article will answer your question.
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Re: ECG - QU

Postby gaurav_singh_md » Mon May 26, 2014 2:58 am

I think you can use Bazett's formula on the QU interval in the same way as it is used for getting the QTc interval.
(Bazett's Formula = QT Interval / √ (RR interval), where RR Interval = 60/HR).

801-4 Prognostic Implications of QT and QU Interval Measures in Acute Myocardial Infarction; Ravi Kishore, Josef Kautzner, John A. Camm, Marek Malik; Journal of the American College of Cardiology, Volume 25, Issue 2, Supplement 1, February 1995, Pages 388A.


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