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 (Hz) [herts]
the SI unit of frequency, equal to one cycle per second.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


Heinrich R., German physicist, 1857-1894. See: hertz, hertzian experiments.

hertz (Hz),

A unit of measure of frequency equivalent to 1 cycle/sec; this term should not be used for radial (circular) frequency or for angular velocity, in which cases the term sec-1 should be used.
[H.R. Hertz]
Farlex Partner Medical Dictionary © Farlex 2012


The standard SI (International System) unit of frequency, which is equal to 1 cycle/second.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.


(Hz) (hĕrts)
A unit of sound or alternating current frequency, 1 Hz is equivalent to 1 cycle per second.
[H.R. Hertz]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

hertz (Hz)

the SI UNIT of frequency measuring cycles per second.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005


Heinrich R., German physicist, 1857-1894.
hertz - a unit of frequency equivalent to 1 cycle per second.
hertzian experiments - experiments demonstrating that electromagnetic induction is propagated in waves analogous to waves of light but not affecting the retina.
Medical Eponyms © Farlex 2012


A unit of frequency equal to one cycle per second. Symbol: Hz.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in periodicals archive ?
The T-wave associated with coronary insufficiency has inverted, symmetrical limbs and sharply pointed arrowhead vertex or nadir.
The third universal definition of MI [35] gives diagnostic criteria for MI: rise and/or fall of cardiac biomarker values plus symptoms of ischemia, or new or presumed new significant ST segment T-wave changes, or new left bundle branch block.
Myocardial damage results in altered electrical potential distributions and repolarization changes manifesting as prolonged Qt dispersion and electrophysiological changes in T-waves [3, 4].
So, due to the absence of the ST segment in [WR.sub.ECG], we observed that the beginning of the T-wave was located in the same position as the end of the QRS complex.
These included the documentation of sustained VT of the morphology described in Table 1 (arrhythmia criteria), the presence of epsilon waves (depolarization criteria) and T-wave inversions in [V.sub.1], [V.sub.2], and [V.sub.3] in the absence of complete Right Bundle Branch Block (RBBB) (repolarization criteria).
For these reasons, automatic algorithms have been developed to determine the beginning of the QRS complex and the end of the T-wave.
Sinus arrest, A-V blocks (2nd and 3rd degree), T-wave depression and atrial premature complexes have been reported in bald eagle given Isoflurane anaesthesia (Aguilar et al.,1995).
The QT interval was measured from the earliest onset of QRS complex to the point of the T-wave offset, defined by a return of the terminal T-wave to the isoelectric TP baseline.
In a repeat of ECG, QRS-complex, P-wave, and T-wave are the main parts that can describe the action of heart.
The treatment with antiplatelets (salicylic acid), Ca-channel antagonists (verapamil), and digoxin was successful and the patient had no symptoms; physical examination was normal, ECG showed the following: sinus rhythm (HR of 60/min) and negative T-wave from leads V2 to V6; chest X-ray corresponded with condition after right pneumonectomy (Figure 2).
In the experimental group, ST segment depression and abnormal T-wave was found in 6(86%) animals within 60min.