Echocardiography Is Not Indicated for an Enlarged Cardiothoracic Ratio

Lucinda Wingate-Saull Yassir Javaid; John Chambers

Disclosures

Br J Cardiol. 2013;20(4) 

In This Article

Abstract and Introduction

Abstract

An increased cardiothoracic ratio (CTR) on chest X-rays is a not uncommon reason for requesting echocardiography. To assess how often the echocardiogram was abnormal in patients with an increased CTR, the results of 62 open-access echocardiograms requested with this indication were analysed.

Means, standard deviations and 95% confidence intervals were calculated for the left ventricular diameters of the patient group investigated. Two-tailed t-tests were used to compare those with and without reported breathlessness, and those with additional radiology consistent with heart failure. Positive predictive values (PPVs) were calculated.

Only four echocardiograms were abnormal, giving a PPV for CTR of 6%. This increased only slightly to 15% with the inclusion of another radiological abnormality, and to 19% with a symptom or sign. We, therefore, conclude that an increased CTR alone is not a valid reason for requesting echocardiography.

Introduction

National Institute for Health and Care Excellence (NICE) guidance for the investigation of breathlessness is to request echocardiography if either the 12-lead electrocardiogram (ECG) is abnormal or the B-type natriuretic peptide (BNP) level raised.[1] Heart size judged by the chest X-ray is not part of this screening process and known not to correlate well with left ventricular (LV) systolic dysfunction.[2–3] Nevertheless, an increased cardiothoracic ratio (CTR) on a chest X-ray is a not uncommon reason for requesting echocardiography.

We, therefore, assessed the results of open-access echocardiography performed because of an increased CTR.

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