Gastro H+I Flashcards
What is Hernia: Congenital diaphragmatic hernia (CDH)?
Congenital defects in the formation of the diaphragm which results in the protrusion of abdominal contents into the thoracic cabity.
What is the background of Hernia: Congenital diaphragmatic hernia (CDH)?
1/2k infants.
More common unilateral though may be bilateral. L>R. Bowel or intraabdominal viscera may be herniated. Common for liver and spleen to be herniated, with associated abnormal hepatic vasculatures. Associated with pulmonary tree abnormalities, surfactant defificney and vasculature changes (hypoplastic lung)
· Posterolateral Bochdalek heriaL 90%, left sided, posterolateral
· Morgagni hernia 3%, right sided anterolateral
· Congenital hiatus hernia: rare, stomach through the esophageal hiatus.
Associated w/ cardiac abnormalities, affected siblings, PPH, CRA, malrotation of bowel.
What would you find in history exam of Hernia: Congenital diaphragmatic hernia (CDH)?
Hx of polyhydramnios, cyanosis, respiratory distress as a neonate. Bochdalek hernia: poor air entry on L and shift in cardiac sounds to the right of the chest. Smaller defects present later as wheezy child or recurrent chest infection.
What investigations would you do for Hernia: Congenital diaphragmatic hernia (CDH)?
Karyotype if appropriate, chromosomal studies
Radiology: CXR with placing of orogastric tube to aid gastric positioning. Cardiac echo for associated abnormalities.
What is the management of Hernia: Congenital diaphragmatic hernia (CDH)?
Medical: NGT to decompress, respiratory support via ETT and mechanical ventilation (avoid high peak inspiratory pressures) Avoid bag/mask. UAC/UVC with monitoring of ABG. Surfactant administration after intubation. ?NO therapy and ECMO.
Surgical: if stabilized, open subcostal approach or thoracoscopic/laproscopic approach. Depends on position of hernia and surgeon. Surgical technique involves careful reduction of herniated contents, definition of the posterior rim and repair with non absorbable sutures.
What are the complications and prognosis of Hernia: Congenital diaphragmatic hernia (CDH)?
Pulmonary hypoplasia, malrotation, volvulis, perforations, renal hypertrophy
Mortality 25-60%. Associated with degree of pulmonary hypoplasia.
What is Hernia: Inguinal hernias (IH)?
Abnormal protrusion of abdominal structures through the inguinal canal and into the inguinal region or scrotum.
What is the background of Hernia: Inguinal hernias (IH)?
5% ful term and 30% premature infants. RHS 60%. Bilateral 15%.
Testicle develops retriperitoneally and then descends into the processus vaginalis under the control of hormones and gubernaculum. The processus vaginalis closes after development but rmains patent in some chinden (PPV) allowing the passage of boewl (IH) or fluid (hydrocele) into the canal. In females, the gubernaculum becomes the ovarian ligament and round ligament, with a PPV it etends into the labium and becomes the canal of Nuck. Hernia is most commonly ileum (male) or ovary (female).
Assoc w/ preterm, low BW, FHx, undescended testes, gastroschisis/exomphalos, Ehlers Danlos, CF, CT disorders and anything increasing IAP.
What would you find in history exam of Hernia: Inguinal hernias (IH)?
Infant: inguinoscrotal swelling ,First presentation with incarceration. Unable to palpate cord superiorly (Differentiate hydrocele) Reducible unless incarcerated. Non transluminable.
Child: supine and standing position, expansile cough impulse
Incarceration: pain, tender non reducible scrotal mass, erythema, vomiting, abdominal distension
DDX: torsion, hydrocele, retractile testes, indescended, femoral hernia, lymphadenopathy.
What investigations would you do for Hernia: Inguinal hernias (IH)?
USS rarely needed to diagnose.
What is the management of Hernia: Inguinal hernias (IH)?
General: herniotomy preformed, Hernia sac located, separated form vas deferens and testicular vessels, transected and ligated. Can be laproscopic with placement of intraperitoneal purse string for closure.
Neonate with reducible hernia: elective repair. Infant: elective repair.
Incarceration: manual reduction under sedation (IV morphine) with repair within 48h.
What are the complications of Hernia: Inguinal hernias (IH)?
Inguinal hernia: incarceration (50% within 1y). Henioromy recurrence 1%.
Prognosis excellent with surgical repair.
What is Hirschsprung disease?
Aganglionosis of the enteric (Auerbach) and submucoasl (Meissner) plexus. Results in functional obstruction.
What is the background of Hirschsprung disease?
1/5k live births, 20% neonatal obstruction.
General: affects anus and variable distance of bowel proximally from it. Classified according to distal bowel affected (ultra short, short, long, total colonic, total intestinal).
EmbryologyL failure of neural crest derived ganglion cells to migrate from proximal to distal bowel during development, leading to lack of PSNS nerves. SNS only in affected bowel leads to hyerptonicity and lack of secretion/ relaxation in response to distension. This leads to stool stasis and narrow lumen.
Pathlogy: increased number of acetylcholinesterase stained nerve endings, and hypertrophied nerve trunks in lamina propria or muscolaris propria.
What would you find in history exam of Hirschsprung disease?
NN:
· Failure to pass meconium <24h.
· Acute intestinal obstruction, distension, poor feeding
· Life threatening enterocolitis
Infantile:
· Chronic obdurate constipation with abdominal distension, No soiling.
· Intermittend abdominal pain and fever during episodes
· Failure to thrive
Depends on age of presentation. Typically abdominal distension with dilated bowel. PR exam leads to sudden explosive gush of stool as examination bypasses aganglionic segment, Septic signs if infected