# curve

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Related to closed curve: simple curve

## curve

[kerv]a line that is not straight, or that describes part of a circle, especially a line representing varying values in a graph.

**dose-effect curve**(

**dose-response curve**) a graphic representation of the effect caused by an agent (such as a drug or radiation) plotted against the dose, showing the relationship of the effect to changes in the dose.

**growth curve**the curve obtained by plotting increase in size or numbers against the elapsed time.

**oxyhemoglobin dissociation curve**a graphic curve representing the normal variation in the amount of oxygen that combines with hemoglobin as a function of the partial pressures of oxygen and carbon dioxide. The curve is said to shift to the right when less than a normal amount of oxygen is taken up by the blood at a given Po

_{2}, and to shift to the left when more than a normal amount is taken up. Factors influencing the shape of the curve include changes in the blood pH, Pco

_{2}, and temperature; the presence of carbon monoxide; alterations in the constituents of the erythrocytes; and certain disease states.

**pulse curve**sphygmogram.

**Spee curve**(

**curve of Spee**) the anatomic curvature of the occlusal alignment of teeth, beginning at the tip of the lower canine, following the buccal cusps of the premolars and molars, and continuing to the anterior border of the ramus.

**strength-duration curve**a graphic representation of the relationship between the intensity of an electric stimulus at the motor point of a muscle and the length of time it must flow to elicit a minimal contraction; see also chronaxie and rheobase. In cardiac pacing it is useful in determining characteristics of a particular pacing electrode and determining the most efficient selection of pacing parameters for an appropriate safety margin.

**survival curve**a graph of the probability of survival versus time, commonly used to present the results of clinical trials, e.g., a graph of the fraction of patients surviving (until death, relapse, or some other defined endpoint) at each time after a certain therapeutic procedure.

## curve

(kerv),**1.**A nonangular continuous bend or line.

**2.**A chart or graphic representation, by means of a continuous line connecting individual observations, of the course of a physiologic activity, of the number of cases of a disease in a given period, or of any entity that might be otherwise presented by a table of figures. Synonym(s): chart (2)

[L.

*curvo,*to bend]## curve

(kerv) a line which is not straight, or which describes part of a circle, especially a line that represents varying values in a graph.**Barnes curve**the segment of a circle whose center is the sacral promontory, its concavity being directed posteriorly.

**curve of Carus**the normal axis of the pelvic outlet.

**dental curve**c. of occlusion.

**dye dilution curve**an indicator dilution curve in which the indicator is a dye, usually indocyanine green.

**growth curve**the curve obtained by plotting increase in size or numbers against the elapsed time.

**indicator dilution curve**a graphic representation of the concentration of an indicator added in known quantity to the circulatory system and measured over time; used in studies of cardiovascular function.

**isodose curves**lines delimiting body areas receiving the same quantity of radiation in radiotherapy.

**curve of occlusion**the curve of a dentition on which the occlusal surfaces lie.

**oxygen-hemoglobin dissociation curve**a graphic curve representing the normal variation in the amount of oxygen that combines with hemoglobin as a function of the tension of oxygen and carbon dioxide.

**Price-Jones curve**a graphic curve representing the variation in the size of the red blood corpuscles.

**Starling curve**a graphic representation of cardiac output or other measure of ventricular performance as a function of ventricular filling for a given level of contractility.

**strength-duration curve**a graphic representation of the relationship between the intensity of an electric stimulus at the motor point of a muscle and the length of time it must flow to elicit a minimal contraction.

**temperature curve**a graphic tracing showing the variations in body temperature.

**tension curves**lines observed in cancellous tissue of bones, determined by the exertion of stress during development.

**ventricular function curve**Starling c.

## curve

Etymology: L,

*curvare,*to bend(in statistics) a straight or curved line used as a graphic method of demonstrating the distribution of data collected in a study or survey.

## curve

(kŭrv)**1.**A nonangular continuous bend or line.

**2.**A chart or graphic representation, by means of a continuous line connecting individual observations of the course of a physiologic activity, of the number of cases of a disease in a given period, or of any entity that might be otherwise presented by a table of figures.

Synonym(s): chart (2) .

[L.

*curvo,*to bend]## curve

(kŭrv)**1.**A nonangular continuous bend or line.

**2.**A chart or graphic representation, by means of a continuous line connecting individual observations, of the course of a physiologic activity, of the number of cases of a disease in a given period, or of any entity that might be otherwise presented by a table of figures.

[L.

*curvo,*to bend]## curve

a line that is not straight; the line representing varying values in a graph.

**area under moment curve**

plasma drug concentration × time after dosing versus time after drug administration.

**area under the curve**

the area under a plasma concentration versus time curve. A measure of drug absorption.

**epidemic curve**

a graphical representation showing the number of new cases of the disease plotted against time. A decision on when the new infection rate creates an epidemic varies with the disease and the circumstances. The rate would need to be clearly in excess of its expected frequency.

**fitted curve**

the theoretical frequency distribution whose closeness of fit to the subject data is under test.

**freehand curve**

a line drawn in by hand on a scattergram to establish the relationship between two variables.

**frequency curve**

a curve representing graphically the probabilities of different numbers of occurrences of an event.

**logarithmic curve**

the curve which demonstrates the straightline relationship between two variables when both of them are scaled as logarithms.

**log dose-response curve**

the standard way of presenting pharmacological data about a drug. The response is plotted against dose on a semilogarithmic graph. It has the advantage that a wide range of dose rates can be entered on the one graph.

**plasma concentration-time curve**

the plasma concentration of a drug plotted against time.

**semilogarithmic curve**

as for logarithmic curve except that only one of the variables is scaled as a logarithm. See also logarithmic relationship.

**sigmoid curve**

an S-shaped curve. A common curve in biological distributions.

**survivorship curve**

a graphic presentation of a life table. Obviously the proportion of survivors decreases with advancing age of the group.

**vertebral curve**

the downward curve of the thoracolumbar region and that of the cervical region in some animals.

## Patient discussion about curve

**Q. I broke my pinkie finger a year ago. It is locked in a curved position. How can I straiten it out?**

**A.**i would let a certified orthopedic look at the finger. treatment is according to the severity of the case. i think Terrany method is about finger physiotherapy. i'm not sure this method is to reshape uneven bone healing. this is a bit different situation, bone can be reshaped, this is how an orthodontic can move teeth- by changing the bone. but it takes a few years. i would go to an orthopedic, i advise you to do the same.