safe period


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Related to safe period: fertile period

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.

safe period

the period during the menstrual cycle when conception is considered least likely to occur. It comprises approximately the 10 days after menstruation begins and the 10 days preceding menstruation. See also contraception.

safe period

The time during the menstrual cycle when conception is supposedly not possible. It typically extends from five days before ovulation to the day ovulation occurs. Because of the great variability of the menstrual cycle, it is either extremely difficult or impossible to predict the portion of the cycle in which intercourse may take place with no chance of conception. Synonym: fertile interval
See also: period

safe period

The part of the menstrual cycle in which coitus cannot result in fertilization because of the absence of an ovum. As a basis for contraception the term is far from appropriate.
References in periodicals archive ?
Brodie adroitly shows how Poor tried to limit births in response to concerns about family finances, childbirth, and her children's health by concentrating sexual activity during what she considered the safe period (days 9 through 15 of the menstral cycle), and perhaps by using vaginal douches and delaying weaning.
But 3 hours at warm temperatures (mid-70s to 80s) is a safe period if foods are well chilled and come directly from the refrigerator or out of ice.
Contrary to Taser's false and misleading descriptions and representations of fact, Taser's model M18 and M26 tasers lack any cut off circuitry to turn the taser off after 5 seconds of operation and prevent the taser from again firing, that is outputting a disabling shock, until the taser's trigger is again pressed by the operator or to intermittently interrupt the shock for any safe period if the trigger is continuously depressed.

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