electrical instability

electrical instability

[i′lek·trə·kəl ‚in·stə′bil·əd·ē]
(electricity)
A persistent condition of unwanted self-oscillation in an amplifier or other electric circuit.
References in periodicals archive ?
However, when this effect is confined to a limited area of the heart, segmental delays in myocardial repolarization may produce global cardiac electrical instability.
But too much CaM kinase, and consequently too much calcium entry into heart cells, causes electrical instability and other downstream molecular problems that can lead to cell overload and cell death, which causes heart failure.
According to one of the current concepts, a large amount of necessary information, required for identification of patients with high level of myocardial electrical instability, i.
Some of that evidence spoke to the efficacy of a conservative, noninvasive management strategy and a recognition that one approach does not fit all when treating patients with unstable angina or non-STEMI who do not have hemodynamic or electrical instability or persistent angina.
Because medications were ineffective in this case, the Mayo Clinic team treated the woman's atrial fibrillation by targeting high-energy radio waves to an area of the atrium -- an upper heart chamber -- most vulnerable to stress-induced electrical instability.
It is the result of poor contraction of the heart or electrical instability of the heart due to the inflammation of the heart muscle.
I think it is consistent with an electrical instability of the heart which could cause sudden instantaneous death with no warning.
The twitching is normally caused by temporary electrical instability in the nerve or muscle and is not a sign of an underlying health problem.
Rachel Lampert, the cardiologist who led the Yale study, found that anger appeared to increase electrical instability in these patients.
Lampert and her team sought to discover whether T-wave alternans (TWA), which monitor electrical instability in the heart induced by anger, would predict future ventricular arrhythmias.
Arrhythmogenic right ventricular cardiomyopathy (ARVC) is characterized by progressive fatty or fibrofatty infiltration of the right ventricular myocardium, which constitutes a substrate for electrical instability and a focus of ventricular arrhythmias (1).
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