alternans

al·ter·nans

(awl-ter'nanz), Avoid the mispronunciation al'ter-nans.
Alternating; often used substantively for alternation of the heart, either electrical or mechanical; used as a noun in the sense of pulsus alternans.
[L.]

alternans

/al·ter·nans/ (awl-ter´nanz) [L.]
1. alternating; see pulsus alternans.

electrical alternans  alternating variations in the amplitude of specific electrocardiographic waves over successive cardiac cycles.
mechanical alternans  alternation of the heart, particularly in contrast to electrical alternans.
pul´sus alternans  see under pulsus.
total alternans  pulsus alternans in which alternating beats are so weak as to be undetected, causing apparent halving of the pulse rate.

alternans

[ôl′tərnənz]
Etymology: L, alternare, to alternate

al·ter·nans

(awl-ter'nanz)
Alternating; used as a noun in the sense of pulsus alternans
[L.]
References in periodicals archive ?
Additionally, we will develop an algorithm for the detection of pulse wave alternans in the photoplethysmogram recorded from the finger, and develop a mobile application to detect repolarization alternans from a fingertip pulse wave using the built-in camera lens.
Objective: The aim of this study was to evaluate influence of noise, T-wave jitter and electrocardiographic (ECG) signal parameters on sensitivity of T-wave alternans (TWA) detection methods.
Results of the Alternans Before Cardioverter Defibrillator (ABCD) Trial show that both diagnostics tests--the T-wave alternans (TWA) test and the electrophysiological study (EPS)--are equally predictive.
Since T-wave alternans often precedes sudden cardiac arrest, researchers have suggested that it could be used to decide which patients need implanted defibrillators (SN: 9/23/06, p.
7 /PRNewswire/ -- The physicians at Westside Medical Associates of Los Angeles (WMALA) in conjunction with Westside Medical Imaging have implemented the use of the novel and exciting Micro-T-Wave Alternans technology for identifying patients at risk for sudden cardiac death (SCD).
SAN FRANCISCO -- The search is on for a more reliable predictor of patients with heart failure who are likely to benefit from an implantable cardioverter defibrillator, and T-wave alternans shows the most promise, Dr.
In multiple clinical studies, the microvolt T-wave alternans testing has been shown to identify accurately both the high- and low-risk patients," explains Dr.
NASDAQ-CAMH), Bedford, Mass, has announced that clinical results, presented at the annual meeting of the American Heart Association demonstrate that Microvolt T-Wave Alternans (MTWA) testing can help determine which MADIT II type patients (prior myocardial infarction and left ventricular ejection fraction of 30% or less) should receive an implantable cardioverter defibrillator (ICD).
The enzyme converts cane or beet sugar to alternans, a class of low-calorie or noncaloric dextrans.
OTCBB: CAMH), a developer of non-invasive diagnostic tests for cardiac disease, today announced that new data presented at the Heart Rhythm Society's 32nd Annual Scientific Sessions in San Francisco confirm the diagnostic value of Microvolt T-wave Alternans (MTWA) testing in identifying patients at risk of sudden cardiac arrest (SCA).
5 cycles per beat; noise, [sigma]noise--mean level and standard deviation of the noise registered in the spectrum in the predefined window located outside the alternans frequency (0.
If such trials prove that T-wave alternans and other new measures can supplement ejection fraction in clinical evaluation of patients, doctors may save more lives even though they implant fewer devices than they do now.