PEDIATRIC Section 7: Luminal GI (Bowel Obstruction in Neonate) Flashcards
Think of bowel obstruction in the nonate as __ or ___.
High or Low
When you say high bowel obstruction, think about these
When you say LOW bowel obstruction, think about these
Why might you think the question is leading you toward obstruction?
Anytime you are dealing with a neonate, and the history mentions
“vomiting,”
“belly pain,” or
“hasn’t passed a stool yet.”
Think of this algorithm when dealing with Bowel Obstruction:
- Bubbles
- Upper GI patterns
- Low Obstruction in Neonate
What are the 9 possible pattern when you think of Bubbles in Neonatal Obstruction?
Single Bubble =
Gastric (Antral or Pyloric) atresia
Double bubble =
Duodenal Atresia (Highly Specific)
Associated conditions in Duodenal Atresia?
- 30% have Downs
- 40% have polyhydramnios and are premature
- The“single atresia” - cannulation error
In Duodenal Atresia, Double bubble can be shown on what trimester? in what modality?
On multiple choice test the “double bubble” can be shown on 3rd trimester OB ultrasound, plain film, or on MRI.
Triple Bubble =
Jenunal Atresia
When you call jejunal atresia, you often prompt search for additional atresias - what are they?
Colonic Atresia
What casuses Jejunal atresia?
Vascular insult during development
“Mulliptle Atresia” =
Vascular error
- Single bubble + distal gas?
- Single bubble + distal gas + bilious vomiting?
- Next step?
- Can mean nothing
- Can be midgut volvulus
- Upper GI
- Double bubble + distal gas?
- Next step?
- Exclude duodenal atresia.
DDx:
a. Duodenal web
b. Duodenal stenosis
c. midgut vovlulus - Next step UPPER GI
- Multiple diffusely dilated loops =
- Next step?
- Low obstruction (ileum or colon)
- Contrast enema - if normal –> Upper GI to exclude atypical look for midgut volvulus
Mildly Dilated, Scattered Loops =
- “Sick Belly” - can be seen in proximal or distal obstruction
- UPPER GI and contrast enma
What are the UPPER GI patterns in Neonates?
Normally, the developmental rotation of the gut places the ligament of Trietz to the LEFT? or to the RIGHT?
Normally, the developmental rotation of the gut places the ligament of Trietz to the LEFT of the spine at the level of duodenal bulb
If mother nature fucks up and this normal rotation doesnt happen, you end up with the duodenum to the right of the midline (spine), you end up with this
Malrotation
Malrotation increase the risk of these conditions:
Midgut volvulus
Internal hernias
Malrotation + bilious vomiting =
Midgut volvulus
Malrotation is associated with these condetions:
Heterotaxy syndromes
Omphaloceles
Diagnosis
Malrotation
Classic Malrotation:
* Small bowel follow through shows all the bowel on one side
* The duodenum does not cross the midline
Diagnosis?
SMA at the right of SMV
What makes UGI fals positive on UGI?
Distal Bowel obstruction displaceing the duodenum (ligamentous laxity)
When I say “Non-bilious voming” - you say?
next step?
Hypertrophic Pyloric Stenosis
Ultrasound
When I say “Bilious vomiting”, - you say?
Next step?
Mid Gut Volvulus (Til proven otherwise)
Upper GI
Diagnosis?
Corkscrew Duodenum
this is diagnostic of midgut volvulus (surgical emergency)
Corckscrew Duodenum
In older children (or even adults) obstruction in the setting of malrotation will present as? what is the caus?
intermittent episodes of spontaneous duodenal obstruction.
The cause is not midgut volvulus (a surgical emergency) but rather kinking from Ladd’s Bands.
What is a Ladd’s Band?
a fibrous stalk o f peritoneal tissues that fixes the cecum to the abdominal wall, and can obstruct the duodenum.
What’s the procedure to prevent midgut volvulus? How is it done?
Ladd’s procedure
Absent distal air
Complete duodenal Atressia
Complete duodenal atresia is strongly associated with what condition?
Midgut volvulus
If the kid is vomiting this might be from extrinsic narrowing (Ladd band, annular pancreas), or intrinsic (duodenal web, duodenal stenosis). You can’t tell.
Partial Duodenal Obstruction
An anatomic variant where the portal vein sits anterior the 2nd part of the duodenum.
Preduodenal Portal Vein