The pylorus in infancy: overall sonographic assessment
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Ultrasonography accurately diagnoses hypertrophic pyloric stenosis (HPS) in infants. Ultrasound reveals significant pyloric length, diameter, and wall thickness increases in infants with HPS compared to controls.
Area of Science:
- Pediatric Radiology
- Gastroenterology
- Infant Health
Background:
- Hypertrophic pyloric stenosis (HPS) is a common cause of non-bilious vomiting in infants.
- Accurate and timely diagnosis of HPS is crucial for appropriate management.
- Ultrasonography has emerged as a primary diagnostic tool for HPS.
Purpose of the Study:
- To evaluate the efficacy of prospective ultrasonic assessment in diagnosing hypertrophic pyloric stenosis (HPS).
- To compare ultrasonic measurements of the pylorus in infants with and without HPS.
- To identify key morphological changes indicative of HPS via ultrasound.
Main Methods:
- Prospective study involving two infant groups: control and clinically suspected HPS.
- Standardized ultrasonic examination of the pylorus.
- Measurement of pyloric length, transverse diameter, and wall thickness.
- Observation of specific antro-pyloric morphological features.
Main Results:
- Infants with HPS showed an 84% increase in mean pyloric length compared to controls.
- Mean transverse diameter (13.4 mm vs 7.45 mm) and wall thickness (4.5 mm vs 2.3 mm) were significantly greater in HPS cases.
- Characteristic morphological changes in the antro-pyloric region were observed in most HPS cases.
Conclusions:
- Ultrasonography provides highly accurate diagnostic criteria for hypertrophic pyloric stenosis, including borderline cases.
- Key ultrasonic findings include increased pyloric dimensions and specific antro-pyloric morphological alterations.
- Ultrasound is an effective non-invasive method for diagnosing HPS in infants.
Abstract:
A prospective ultrasonic evaluation of the pylorus was performed in two groups of infants, a control group and a group of infants clinically suspected of having hypertrophic pyloric stenosis (HPS). The mean pyloric length in the hypertrophied condition was 84% longer than the mean length in the normal. The mean and standard deviation (sd) for the transverse diameter and pyloric wall thickness in the normals were 7.45 +/- 2.2 mm and 2.3 +/- 0.7 mm respectively, while the corresponding measurements for the mean and sd in HPS were 13.4 +/- 1.6 mm and 4.5 +/- 0.9 mm. In most of the HPS cases the known morphological changes of the antro-pyloric region such as: impingement on the fluid filled antrum, pre-pyloric antral thickening, extension of fluid into the proximal portion of the pyloric canal and the angle formed between antral peristaltic wave and pyloric mass, were observed. Detection of these changes furnished further criteria for highly accurate diagnosis of HPS even of borderline cases.