cardiothoracic ratio

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 [ra´she-o] (L.)
an expression of the quantity of one substance or entity in relation to that of another; the relationship between two quantities expressed as the quotient of one divided by the other.
A/D ratio adult versus developmental toxicity ratio; the ratio between the toxic effects of a substance on adults (humans or animals, especially pregnant females) and such effects on developing embryos or fetuses.
A-G ratio (albumin-globulin ratio) the ratio of albumin to globulin in blood serum, plasma, cerebrospinal fluid, or urine.
arm ratio a figure expressing the relation of the length of the longer arm of a mitotic chromosome to that of the shorter arm.
benefit-risk ratio a determination of the potential of a research study for positive effects on patients compared to the risks of doing harm.
cardiothoracic ratio on a chest radiograph, the ratio of the transverse diameter of the heart to the internal diameter of the chest at its widest point just above the dome of the diaphragm.
grid ratio a ratio comparing the height of lead lines in an x-ray grid to the distance between the lead strips.
inspiratory-expiratory ratio the ratio of the inspiratory time to the expiratory time during the breathing cycle. Normally, expiratory time will be longer than inspiratory time; if the inspiratory time is longer than the expiratory time, gas trapping may result.
lecithin/sphingomyelin ratio see lecithin-sphingomyelin ratio.
risk ratio relative risk.
sex ratio the proportion of one sex to the other; by tradition the number of males in a population to the number of females, usually stated as the number of males per 100 females.
signal-to-noise ratio the ratio between the amplitude of a signal being measured and that of the noise.
urea excretion ratio the ratio of the amount of urea in the urine excreted in one hour to the amount in 100 ml of blood. The normal ratio is 50.
zeta sedimentation ratio (ZSR) a measurement comparable to the erythrocyte sedimentation rate, except that it is unaffected by anemia. The packed-cell volume (zetacrit) of a blood specimens is calculated by centrifuging the specimen in a Zetafuge, a specially designed instrument that produces controlled cycles of compaction and dispersion and allows rouleaux to form and sediment rapidly. The zetacrit divided into the true hematocrit gives the zeta sedimentation ratio.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

car·di·o·tho·rac·ic ra·ti·o

the ratio of the horizontal diameter of the heart to the inner diameter of the rib cage at its widest point as determined on a chest roentgenogram.
Farlex Partner Medical Dictionary © Farlex 2012

car·di·o·tho·rac·ic ra·ti·o

(kahr'dē-ō-thōr-as'ik rā'shē-ō)
The ratio of the horizontal diameter of the heart to the inner diameter of the rib cage at its widest point as determined on a chest roentgenogram.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
2 = 4.264, P = 0.039), the cardiothoracic ratio of the TVR group was larger than that of the TVP group ( t = 0.044, P = 0.044), and there was a significant difference in Carpentier type between the TVR and TVP groups (Fisher's exact test, P = 0.001) [Table 2].
Ito, "Effect of aging on cardiothoracic ratio in women: A longitudinal study," Gerontology, vol.
Danisa et al., "The relationship between cardiothoracic ratio and left ventricular ejection fraction in congestive heart failure," JAMA Internal Medicine, vol.
Correlations among NT-proBNP levels, LVEF, LA diameter, and the cardiothoracic ratio with miR-126 expression were performed using Pearson correlation analysis.
The aim of this study was, therefore, to evaluate the effects of surgical ASD repair on functional status, right ventricular size, cardiothoracic ratio and pulmonary hypertension in patients over 40 years of age.
Objective: In this study we compared cardiothoracic ratio on chest radiography and left ventricular dimensions from echocardiography in patients with left heart valvular regurgitation.
Overall heart size can be evaluated from chest films in a variety of ways; two of the most popular ways are calculation of the cardiothoracic ratio from posteroanterior (PA) films alone, and determination of the total cardiac silhouette volume utilizing both PA and lateral projections (2).