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[Cardiothoracic ratio]

Y Hada1

  • 1Department of Cardiology, JR Tokyo General Hospital.

Journal of Cardiology
|July 1, 1995
PubMed
Summary
This summary is machine-generated.

The cardiothoracic ratio on chest X-rays is unreliable for diagnosing cardiac enlargement. Echocardiography is the accurate method for assessing cardiac dilatation, while chest X-rays are useful for follow-up.

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Area of Science:

  • Cardiology
  • Radiology
  • Medical Imaging

Background:

  • The cardiothoracic ratio (CTR) on chest X-rays is a traditional indicator for cardiac size.
  • A CTR of 50% is often considered the upper limit of normal, but this can lead to misdiagnosis, especially in certain populations.
  • Factors like obesity, age, and technical variations can affect CTR accuracy.

Purpose of the Study:

  • To evaluate the correlation between left ventricular dimension and cardiothoracic ratio in subjects with normal cardiac function.
  • To assess the reliability of chest X-ray in diagnosing cardiac dilatation compared to echocardiography.

Main Methods:

  • Correlation analysis was performed between left ventricular end-diastolic dimension and cardiothoracic ratio.
  • Eighty consecutive subjects with normal physical, ECG, and Doppler echocardiography examinations were included.

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  • Standard chest X-ray measurements were compared with echocardiographic findings.

    • Main Results:

    • No significant relationship was found between left ventricular end-diastolic dimension and the cardiothoracic ratio.
    • The study highlights limitations of CTR in accurately reflecting cardiac size and potential for false positives.
    • Echocardiography demonstrated superior accuracy in diagnosing cardiac dilatation.

    Conclusions:

    • Chest X-ray is essential for initial cardiac assessment but should be interpreted cautiously for cardiac dilatation.
    • Echocardiography is the definitive diagnostic tool for cardiac enlargement.
    • Chest X-rays remain valuable for monitoring and managing diagnosed cardiac conditions.