refractory period

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period

 [pēr´e-od]
an interval or division of time; the time for the regular recurrence of a phenomenon.
absolute refractory period the part of the refractory period from phase 0 to approximately −60 mV during phase 3; during this time it is impossible for the myocardium to respond with a propagated action potential, even with a strong stimulus. Called also effective refractory period.
blanking period a period of time during and after a pacemaker stimulus when the unstimulated chamber is insensitive to avoid sensing the electronic event in the stimulated chamber.
effective refractory period absolute refractory period.
ejection period the second phase of ventricular systole (0.21 to 0.30 sec), between the opening and closing of the semilunar valves, while the blood is discharged into the aorta and pulmonary artery. Called also sphygmic period.
gestation period see gestation period.
incubation period see incubation period.
isoelectric period the moment in muscular contraction when no deflection of the galvanometer is produced.
latency period
latent period a seemingly inactive period, as that between exposure to an infection and the onset of illness (incubation period) or that between the instant of stimulation and the beginning of response (latency, def. 2).
refractory period the period of depolarization and repolarization of the cell membrane after excitation; during the first portion (absolute refractory period), the nerve or muscle fiber cannot respond to a second stimulus, whereas during the relative refractory period it can respond only to a strong stimulus.
relative refractory period the part of the refractory period from approximately −60 mV during phase 3 to the end of phase 3; during this time a depressed response to a strong stimulus is possible.
safe period the period during the menstrual cycle when conception is considered least likely to occur; it comprises approximately the ten days after menstruation begins and the ten days preceding menstruation. See the section on fertility awareness methods, under contraception.
sphygmic period ejection period.
supernormal period in electrocardiography, a period at the end of phase 3 of the action potential during which activation can be initiated with a milder stimulus than is required at maximal repolarization, because at this time the cell is excitable and closer to threshold than at maximal diastolic potential.
vulnerable period that time at the peak of the T wave during which serious arrhythmias are likely to result if a stimulus occurs.
Wenckebach's period a usually repetitive sequence seen in partial heart block, marked by progressive lengthening of the P–R interval; see also dropped beat.

re·frac·to·ry pe·ri·od

1. the period following effective stimulation, during which excitable tissue such as heart muscle and nerve fails to respond to a stimulus of threshold intensity (that is, excitability is depressed);
2. a period of temporary psychophysiologic resistance to further sexual stimulation that occurs immediately following orgasm.

refractory period

A component of the resolution phase, the fourth and final phase of Masters and Johnson’s four-stage model of physiological responses to sexual stimulation, which follows the orgasmic phase. During the refractory period, it is typically physiologically impossible for males to have additional orgasms: the male is sexually satiated physically, and the penis is flaccid and unerectable. Further stimulation of the now hypersensitive penis may even be painful. As further orgasm may be achieved by females following the first, they typically do not have a refractory period.

refractory period

Cardiac pacing The time during which a pacemaker's sensing mechanism is nonresponsive–in full or in part to cardiac activity–eg, to a retrograde P-wave in a DDD pacemaker. See Pacemaker Sexuality A post-orgasm recovery period lasting from mins to hrs during which the penis is unerectable. See Erection.

re·frac·to·ry pe·ri·od

(rĕ-frak'tŏr-ē pēr'ē-ŏd)
1. The time following effective stimulation, during which excitable tissue such as heart muscle and nerve fails to respond to a stimulus of threshold intensity (i.e., excitability is depressed).
2. A period of temporary psychophysiologic resistance to further sexual stimulation, which occurs immediately following orgasm.

refractory period

The period immediately following the passage of a nerve impulse or the contraction of a muscle fibre during which a stimulus, normally capable of promoting a response, has no effect.

refractory period

the period of inexcitability, that normally lasts about three milliseconds, during which the AXON recovers after it has transmitted an impulse. During the refractory period it is impossible for the axon to transmit another impulse, because the membrane is being repolarized by ionic movements at this time. During the absolute refractory period no NERVE IMPULSE can be transmitted, but during the relative refractory period an impulse can be transmitted providing the stimulus is strong.

re·frac·to·ry pe·ri·od

(rē-frak'tŏr-ē pēr'ē-ŏd)
Duration following effective stimulation, during which excitable tissue fails to respond to a stimulus.
References in periodicals archive ?
HR SHG: Heart rate during sustained hand grip, Rec1: 1st min of recovery phase, Rec2: 2nd min of recovery phase, Rec3: 3rd min of recovery phase, Rec4: Mean of 4th and 5th min of recovery phase, Rec5: Mean of 6th and 7th min of recovery phase, Rec6: Mean of 8th and 9th min of recovery phase, ANOVA: Analysis of variance, SE: Standard error Table 2: Analysis of mean recovery heart rate during protocol I?
ADL, HDS and IMCT scores of DEACMP group as well as correlations with S100B and GFAP levels: The ADL, HDS and IMCT scores of the DEACMP group in the acute phase were significantly different from those of the recovery phase (P0.05).
RMS percentage increase in the recovery phase was compared using the same methods as the push phase.
However, eight men had not recovered spermatogenesis enough to meet the criteria for return to fertility; five of these showed restored sperm counts by week 74 of the recovery phase, two declined further follow-up, and one did not recover within 4 years of the last injection.
During recovery phase I (early recovery) average response time for opening eyes on command was 8.04[+ or -]1.06 minutes in group I and 5.00[+ or -]0.81minutes in group II (Table I).
With the recovery phase now in motion, Red Cross is providing ongoing support to assist families and individuals; to clean-up, repair and rehabilitate shelters and homes; to support community initiatives and small businesses; and to work on community resiliency and disaster preparedness.
SpA Italy uses an Atlas Copco oil-free HX booster to compress and recycle CO2 during the recovery phase of its dis-infestation process.
Coronato said the search and recovery phase of the investigation will continue until officials are certain they've accounted for the approximately 40 people who were registered at the motel.
Coronato says the search and recovery phase of the investigation will continue until officials are certain they've accounted for the approximately 40 people who were registered at the motel.
""Given our important and growing people to people ties--and following on our $20 million in humanitarian assistance and the successful deployment of our 320 member Disaster Assistance Relief Team (DART) to Panay Island the Government of Canada will continue to assist the Philippines in the reconstruction and recovery phase," Reeder said in a statement issued on Monday.
Positive MP-IgM and/or MP-IgG antibody titers that were more than fourfold higher in the recovery phase than in the acute phase were regarded as positive results [12-14].
Contrary to the Council, MEPs moved the intervention of a special manager from the recovery phase to the resolution phase (ie later).