Guía de Práctica Clínica de estenosis hipertrófica del píloro / Clinical Practice Guidelines in Hypertrophic Pyloric Stenosis

La estenosis hipertrófica del píloro es una enfermedad que se presenta fundamentalmente en lactantes, ocurre por un estrechamiento del canal pilórico debido a la hipertrofia gradual de la capa muscular de su esfínter, lo que origina un síndrome pilórico. El objetivo de esta publicación es presentar una actualización sobre el tema. La etiología de la enfermedad es desconocida, la tendencia actual es que se trata de una enfermedad que no es congénita y se sugiere un origen multifactorial, donde influyen factores genéticos y ambientales. Su síntoma fundamental son los vómitos no biliosos y el diagnostico se complementa con el ultrasonido abdominal. El tratamiento de elección es quirúrgico y sus resultados generalmente satisfactorios. La aprobación de esta guía por los servicios de cirugía pediátrica del país la convierten en un útil instrumento asistencial y docente(AU)

Hypertrophic Pyloric Stenosis is a disease that occurs mainly in infants, caused by a narrowing of the pyloric channel due to the gradual hypertrophy of the muscle layer of the sphincter, which originates a pyloric syndrome. The aim of this publication is to present an update on the topic. The etiology of the disease is unknown, the current trend is that it is a disease that is not congenital and a multifactorial origin is suggested, where genetic and environmental factors influence. Its main symptom is non-bilious vomiting and diagnosis is supplemented with abdominal ultrasound. The treatment of choice is the surgical one and its results are generally satisfactory. The approval of this guidelines by the country's pediatric surgery services makes it a useful care and teaching tool(AU)

Ultrasound-guided paravertebral block for pyloromyotomy in 3 neonates with congenital hypertrophic pyloric stenosis / Bloqueio paravertebral guiado por ultrassom para piloromiotomia em 3 recém-nascidos com estenose hipertrófica de piloro congênita / Bloqueo paravertebral ecoguiado para la piloromiotomía en 3 neonatos con estenosis hipertrófica de píloro congénita

Hypertrophic pyloric stenosis is a relatively common affection of gastrointestinal tract in childhood that results in symptoms, such as projectile vomiting and metabolic disorders that imply a high risk of aspiration during anesthetic induction. In this way, the carrying out of a technique with general anesthesia and intravenous rapid sequence induction, preoxygenation and cricoid pressure are recommended. After the correction of systemic metabolic alkalosis and pH normalization, cerebrospinal fluid can keep a state of metabolic alkalosis. This circumstance, in addition to the residual effect of neuromuscular blocking agents, inhalant anesthetics and opioids could increase the risk of postoperative apnea after a general anesthesia.

A estenose hipertrófica do piloro é uma condição relativamente comum do trato gastrintestinal na infância, que causa um quadro de vômitos em jato e alterações metabólicas que envolvem um alto risco de aspiração durante a indução da anestesia. Assim, recomenda-se uma técnica sob anestesia geral e indução intravenosa de sequência rápida, pré-oxigenação e pressão cricoide. Após a correção da alcalose metabólica sistêmica e normalização do pH, o líquido cerebrospinal pode manter um estado de alcalose metabólica. Isso, juntamente com os efeitos residuais de agentes bloqueadores neuromusculares, anestésicos e opioides, pode aumentar o risco de apneia pós-operatória após anestesia geral.

La estenosis hipertrófica de píloro es una afección relativamente común del tracto gastrointestinal en la infancia, que conlleva un cuadro de vómitos en proyectil y alteraciones metabólicas que implican un elevado riesgo de aspiración durante la inducción anestésica. Así, se recomienda la realización de una técnica con anestesia general e inducción de secuencia rápida intravenosa, preoxigenación y presión cricoidea. Tras la corrección de la alcalosis metabólica sistémica y normalización del pH, el líquido cefalorraquídeo puede mantener un estado de alcalosis metabólica. Esta circunstancia, junto con el efecto residual de los bloqueantes neuromusculares, agentes anestésicos inhalatorios y opioides podrían incrementar el riesgo de apnea postoperatoria tras una anestesia general.

validity of ultrasound in diagnosing hypertrophic pyloric stenosis

To evaluate the validity of ultrasound for diagnosis and exclusion of pyloric stenosis in the infants with nonbilious vomiting. In a cross-sectional study, 444 consecutive infants with clinical suspicion of pyloric stenosis were evaluated by ultrasound [US] and categorized as pyloric stenosis or not according measuring parameters as muscle thickness, muscle width and canal length of pylorus. Positive findings were confirmed at surgery; Negative findings were confirmed by means of follow up. Sensitivity, specificity and accuracy were calculated. Sensitivity, specificity and accuracy of ultrasound were 100% if pyloric muscle thickness of >3mm was chosen as diagnostic. When muscle thickness more than 4mm was used, sensitivity, specificity and accuracy were 96%, 100% and 99.32% respectively. Ultrasound is highly sensitive and specific if pyloric muscle thickness 3 mm is used as cut off point. By virtue of direct visualization of the pyloric muscle, ultrasound is method of choice for both the diagnosis and exclusion of pyloric stenosis in infants

[Infantile hypertrophic pyloric stenosis. A 142 cases report]

Hypertrophic pyloric stenosis [HPS] is a common condition affecting infants before the first three months of life. Analysis of our results and comparison with literature to determine particularities of HPS in our country. We conducted a retrospective review of 142 patients presenting HPS, between 1990 and 2003. In this study male sex was predominant, with a sex-ratio of 3,8/1. The classical symptom of projectile vomiting was always present, a pyloric tumor was palpated in 19,7% of the cases, metabolic disturbance was noted in 44,3% of patients. The diagnosis was confirmed by ultrasonography and sometimes contrast upper gastrointestinal study. All the infants were treated surgically unless three patients dying before operation, because of a late diagnosis. Postoperative courses were uneventful in 87.4% of cases. Three patients were dead after operation, because of medical complication. The cause of HPS is unknown. The diagnosis is suggested by clinic features and confirmed by imaging. Early diagnosis prevents from metabolic complications due to vomiting. Surgical treatment allows early feeding and is associated with a low complication rate and a good long-term outcome

Estenosis hipertrófica de píloro: presentación de un caso y actualización / Hypertrophic pyloric stenosis: a case report and update

La estenosis hipertrófica de píloro es una anomalía congénita frecuente, caracterizada por la hipertrófia de la capa muscular circular del estomago en la región pílorica, la que requiere de modo obligatorio cirugía para su corrección. La edad usual en la que se presenta el cuadro es de la tercera a la sexta semana, con un cuadro emético no bilioso, progresivamente continuo hasta llegar al estado del vómito permanente e incontrolable. Se publica el caso de un lactante menor de 6 semanas de edad, asintomático hasta dos días previos a su consulta, iniciando su expresión clínica con un cuadro de emésis incoercible que obligó a una ecografía, la misma que no mostraba claramente la patología de base, por lo que se realizó una serie radiográfica esófagogastroduodenal, que revelaba impedimento paso de contraste a duodeno, llegándose al diagnóstico de estenosis y obstrucción pilórica completa, por lo que a las pocas horas de su diagnóstico fue operado con éxito. Por la ausencia de síntomas previos al vómito incoercible, su presentación brusca y la poca ayuda diagnóstica de la ecografía. Se presenta el caso de referencia y se realiza una breve actualización, con énfasis en aspectos de diagnóstico diferencial en casos de vómito para la edad del paciente.

Hypertrophic stenosis of the pylorus is a frequent congenital abnormality, characterized by hypertrophy of the circular muscle layer of the stomach in the region of the pylorus which needs obligatory surgery for correction. The common age at which this alteration appears is from three to six weeks with non bilious vomiting that progresses continuously to a state of permanent and incontrollable vomiting We present the case of a less than six weeks old baby which had shown no symptoms until two days previous to consultation, starting clinical signs with uncontrollable vomiting that required an echography which did not clearly show the underlying pathology. For this reason , a series of oesophagogastroduodenal radiographies was performed which showed an obstructed pass of the contrast to the duodenum. Therefore the diagnosis of stenosis and complete pyloric obstruction was made, and a few hours later the baby underwent successful surgery.Due to the absence of symptoms previous to the uncontrollable vomiting, its sudden appearance, and the little diagnostic help of the echography, we report the present case, and make a short actualisation, emphasizing diagnostic aspects and differential diagnosis in cases of vomiting for the age of the patient.

Infantile hypertrophic pyloric stenosis: surgical or medical treatment?

Surgical treatment is the gold standard method for treatment of infantile pyloric stenosis. Surgery, however, is not without risks. Medical treatment with atropine was introduced long time ago and seems to be an attractive alternative to surgery. To treat infantile pyloric stenosis medically or surgically is still a controversial area. To test whether medical treatment is as effective as surgery in treatment of infantile pyloric stenosis and to determine which infant is suitable for either modality. 28 infants with infantile pyloric stenosis were included in this study. In all infants the diagnosis was confirmed by an abdominal ultrasound and gastrographin study. Medical treatment consisted of intravenous atropine 0.01 mg/kg /dose every 4 hours followed by oral atropine 0.02 mg/kg/dose every 6 hours. Surgical treatment consisted of standard Ramstdt's pyloromyotomy under general anesthesia. 14 infants were treated medically and 14 infants were treated surgically. Medical treatment was successful in 8 infants [66%] whereas surgical treatment was successful in all cases [p <0.002]. Mean hospital stay was 10 +/- 2 days in medically treated infants and it was 3 +/- 1 days in surgically treated infants [P<0.0001]. In our Hospital, surgical treatment is superior to medical treatment in cases of infantile pyloric stenosis. However the encouraging success rate of medical treatment may justify trying it in infants waiting for surgery or in infants in whom surgery is contraindicated