hysteresis (redirected from Hysterysis)

hysteresis /hys·te·re·sis/ (his″tĕ-re´sis) [Gr.]

1. a time lag in the occurrence of two associated phenomena, as between cause and effect.

2. in cardiac pacemaker terminology, the number of pulses per minute below the programmed pacing rate that the heart must drop in order to cause initiation of pacing.

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hys·ter·e·sis (hst-rss)

n. pl. hys·ter·e·ses (-sz)

The lagging of an effect behind its cause, as when the change in magnetism of a body lags behind changes in the magnetic field.

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hyster·etic (-rtk) adj.

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hysteresis

[his′tərē′sis]

Etymology: Gk, hysterein, to be late

1 a lagging or retardation of one of two associated phenomena or a failure to act in unison.

2 the influence of the previous condition or treatment of the body on its subsequent response to a given force, as in the elastic property of a lung. At any given lung volume the elastic recoil pressure within the airways during expiration is less than that which exists at the same lung volume during inspiration.

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hysteresis [his-tĕ-re´sis]

1. the failure of coincidence of two associated phenomena, such as that exhibited in the differing temperatures of gelation and of liquefaction of a reversible colloid.

2. a phenomenon exhibited by a physical system in which the system's response to an outside influence depends not only on the instantaneous magnitude of the influence but also on the system's previous history, as when a material undergoing cyclical loading exhibits a loss of energy between cycles of loading and unloading.

3. in cardiac pacing terminology, the number of pulses per minute below the programmed pacing rate that the heart must drop in order to cause initiation of pacing; it can be programmed in by a pulse generator.

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hysteresis (histerē´sis),

n a physical phenomenon whereby a material such as a reversible hydrocolloid passes from a solid to a gel state at one temperature and a gel to a solid state at another.

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hysteresis

the failure of coincidence of two associated phenomena, such as that exhibited in the differing temperatures of gelation and of liquefaction of a reversible colloid.