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PEDIATRICS Vol. 103 No. 2 February 1999, p. e15

ELECTRONIC ARTICLE:
Chest Roentgenogram in the Evaluation of Heart Defects in Asymptomatic Infants and Children With a Cardiac Murmur: Reproducibility and Accuracy

Received Feb 24, 1998; accepted Sep 11, 1998.

Niels H. Birkebæk*, Lars K. Hansen*, Bo ElleDagger , Poul E. AndersenDagger , Merete Friis§, Mogens Egeblad§, Karen Damgaard-Pedersenparallel , Nina T. Nielsen, and Henrik Oxhøj*

From the * Department of Pediatrics, Odense University Hospital, Denmark; the Dagger  Department of Radiology, Odense University Hospital, Denmark; the § Department of Radiology, Glostrup Hospital, Denmark; the parallel  Department of Radiology, Rigshospitalet, Denmark; and the  Department of Radiology, Køge Hospital, Denmark.

Objectives.    To evaluate the reproducibility and the accuracy of pediatric radiologists' assessments of chest radiographs with respect to the presence or absence of heart defects in children with an asymptomatic heart murmur.

Design.    Ninety-eight children, ages 1 month to 15 years (median, 30.1 months), referred for evaluation of a heart murmur were consecutively included. They all had a standard chest radiograph and a color Doppler echocardiograph (CDE) performed. Six specialists in pediatric radiology evaluated the chest radiographs independently on two occasions 6 months apart. The radiologists were asked to classify each set of films into one of two categories: heart disease or no heart disease. The outcome of the CDE was considered the definite diagnosis. kappa  statistics were used to analyze the reproducibility of the radiologic assessments. Sensitivity, specificity, and the predictive value of a positive and a negative test were used for evaluation of the accuracy of the radiologic assessments.

Results.    Mean intra- and interobserver kappa  values were all <0.6, and the majority were <0.4. Mean sensitivity was 0.3 (range: 0.17-0.52), mean predictive value of a positive test was 0.4, implying that 60% of the positive assessments were falsely positive. Mean specificity was 0.86 (range: 0.75-0.93) and the mean predictive value of a negative test was 0.80 implying that 20% of the negative assessments were falsely negative.

Conclusion    We found a low reproducibility, as well as a low accuracy, of the radiologic assessments of the chest radiographs of children with an asymptomatic heart murmur with respect to the presence or absence of heart disease. A false-positive radiologic assessment of the chest radiograph with respect to heart defects causes unnecessary anxiety and further examinations, whereas a false-negative assessment might result in omission of relevant investigations and proper identification of the heart defect. We cannot recommend the use of chest radiographs in the initial evaluation of the asymptomatic child with a heart murmur. If a heart defect cannot be excluded by clinical examination a CDE must be performed.  Key words:  child, cardiac murmur, chest radiograph, reproducibility, accuracy.




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