cardiothoracic ratio

noun

The ratio (MRD + MLD) / ID, where MRD is the greatest perpendicular diameter from midline to right heart border; MLD is the greatest perpendicular diameter from midline to left heart border; and ID is the internal diameter of the chest at the level of the right hemidiaphragm.

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Meanings

nouncardiothoracic ratio (plural cardiothoracic ratios)

plural cardiothoracic ratios

  1. medicineThe ratio (MRD + MLD) / ID, where MRD is the greatest perpendicular diameter from midline to right heart border; MLD is the greatest perpendicular diameter from midline to left heart border; and ID is the internal diameter of the chest at the level of the right hemidiaphragm.
Cite this entry
APA

cardiothoracic ratio. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/cardiothoracic%20ratio

MLA

“cardiothoracic ratio.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/cardiothoracic%20ratio. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “cardiothoracic ratio,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/cardiothoracic%20ratio.

Source: cardiothoracic ratio on Wiktionary, CC BY-SA 4.0.