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Echocardiographic assessment of valvular pulmonary stenosis in children
Insights
Maximal amplitude of pulmonary valve motion (Amax) is not a reliable measure for diagnosing or assessing the severity of pulmonary stenosis in children. This echocardiographic finding showed significant overlap across different patient groups, limiting its clinical utility.
Area of Science:
- Pediatric Cardiology
- Echocardiography
- Valvular Heart Disease
Background:
- Maximal amplitude of pulmonary valve motion following atrial contraction (Amax) has been proposed as a clinical tool for evaluating valvular pulmonary stenosis.
- Assessing the diagnostic accuracy of Amax in pediatric populations is crucial for its clinical application.
Purpose of the Study:
- To determine the specificity and sensitivity of Amax in identifying and grading pulmonary stenosis in children.
- To evaluate the utility of Amax in non-invasive assessment of post-pulmonary valvotomy outcomes.
Main Methods:
- Retrospective review of echocardiograms from 120 children.
- Subjects included normal individuals, patients with atrial septal defect, and patients with confirmed pulmonary stenosis (mild, moderate, severe).
- Pulmonary valve motion (Amax) was measured and compared across groups.
Main Results:
- Amax values showed considerable overlap between normal subjects and patients with pulmonary stenosis of varying severity.
- No significant differences in Amax were found between patients with atrial septal defect and those with pulmonary stenosis.
- Amax could not reliably differentiate between normal and stenotic pulmonary valves or grade the severity of stenosis.
Conclusions:
- Maximal amplitude of pulmonary valve motion (Amax) is neither specific nor sensitive for diagnosing valvular pulmonary stenosis in children.
- Amax is not a suitable non-invasive method for evaluating the severity of pulmonary stenosis or the results of pulmonary valvotomy.
Abstract:
It has been suggested that the maximal amplitude of the pulmonary valve motion following atrial contraction (Amax) may be useful in the clinical evaluation of patients with valvular pulmonary stenosis. To evaluate the specificity and sensitivity of this measurement in children, we reviewed the echocardiograms of the pulmonary valve of 120 subjects: 57 normal individuals, 25 patients with secundum atrial septal defect and without pulmonary hypertension, and 32 patients with pulmonary stenosis proven at catheterisation (mild in 16 patients, moderate in nine, and severe in seven). Amax ranged from 0 to 12 mm in the normal subjects, and from 2 to 16 mm in those with atrial septal defect. In mild pulmonary stenosis, Amax ranged from 2 to 12 mm, in moderate pulmonary stenosis from 2 to 14 mm, and in severe pulmonary stenosis, from 3 to 12 mm. Though mean Amax was significantly larger in patients with moderate and severe pulmonary stenosis compared with normal subjects, there was much overlap between the two groups so that individual cases could not be identified correctly from this measurement. No significant difference was observed when comparing Amax values of patients with atrial septal defect and those of patients with pulmonary stenosis of various severity, nor were any observed between the pulmonary stenosis groups. These findings indicate that Amax is neither specific nor sensitive for the presence or severity of valvular pulmonary stenosis in children, and that it cannot be used to evaluate non-invasively the results of pulmonary valvotomy.