Gastro Flashcards
How does malrotation present? Ivx?
• May be asymptomatic but will present with obstruction once the duodenum twists ± compromised blood supply → no stools, cramps, crying and pulling legs up
- Classically first few days of life – obstruction with bilious vomiting
- Can present at any age with volvulus
- Look for bilious vomiting + signs of dehydration
IX:
• Urgent upper GI contrast study - gold standard
(AXR) to assess intestinal rotation in any child with dark green vomiting
• Abdominal xray:
- bird-beak cut-off of duodenum (volvulus);
- corkscrew of duodenum (volvulus)
• FBC - anaemiia, polycythaemia
can do - ABG: metabolic acidosis with respiratory alkalosis (bcos reduced bowel perfusion -> lactic acidosis)
How is malrotation managed?
- Urgent laparotomy – Ladd’s procedure if signs of vascular compromise
- Untwist volvulus, mobilize duodenum, place bowel in non-rotated position and remove necrotic bowel
What is IBS? How does it present?
Irritable bowel syndrome (IBS) is a chronic condition characterised by abdominal pain associated with bowel dysfunction.
The pain is often relieved by defecation and is sometimes accompanied by abdominal bloating.
There are no structural abnormalities to explain the pain. IBS occurs in about 15% of the adult population.
May have: passage of mucus with stool urgency of defecation Tenesmus Constipation Explosive loose stools
How could we ivx IBS?
FBC - normal
Tests to rule out other dfx:
Fecal occult blood - normal. Positive in IBD or CC
Etc
How is IBS treated?
Depends if diarrhoea or constipation predominant
Both need lifestyle advice: food to avoid that make diarrhoea or constipation worse
Adjuncts - loperamide for diarrhoea and laxatives for constipation
What is the variation in presentation of gastroenteritis based on pathogen of aetiology?
Most commonly rotavirus – 60% in <2y
• Campylobacter jejuni (+ abdo pain)
• Shigella/salmonella (+blood and pus in stool, tenesmus)
• Cholera/E. coli (profuse, rapidly dehydrating diarrhea)
What is the presentation of gastroenteritis?
Diarrhoea plus or minus vomiting
Define acute diarrhoea?
3+ stools in 24 hours
Lasts for up to 2 weeks
Stools liquid or semi liquid
How do we manage gastroenteritis?
Advice eg more fluid intake
if in shock
Give IV fluid bolus THEN maintenance therapy
1st - try oral fluids
If cant tolerate eg vomiting then 2nd - IV fluids
• ABX if – suspected sepsis, extra-intestinal
spread, salmonella (<6m, malnourished, for specific organisms eg. C diff, giardiasis, shigella, cholera) - post stool culture
- SAFETY NET:
- Diarrhoea: usually 5-7d, most stop within 2 weeks
- Vomiting: usually 1-2d, most stop within 3 days
Assessing dehydration
• Weight loss is the most accurate marker
• Can use clinical signs to estimate degree of dehydration
Consider admission if dehydrated, shock etc
- No clinically detectable dehydration (<5% loss of body weight)
- Clinical dehydration (5-10%)
- Shock (>10%)
Anti diarrhoeal and anti emetic drugs are NOT recommended for kids!
How may coeliac disease present in kids?
• Profound malabsorption syndrome at 8-24m after introduction of wheat-containing weaning foods → failure to thrive, abdo distension:
Classic sx:
bloated tummy
irritability
diarrhoea, constipation and other gut symptoms
faltering growth or a change in growth pattern.
Most common cause of malabsorption in kids?
• May present later in childhood with non-specific GI symptoms, anemia, iron or folate def, growth failure
Recurrent mouth ulcers Blood deficiencies Autoimmune conditions eg diabetes Elevated tea Sami ashes FH Unexplained depression or anxiety
dermatitis herpetiformis - with red, raised patches often with blisters -> not everyone gets this
How do we ivx coeliac in kids?
• Assess for malnutrition – weight, height, BMI
IX: super sensitive and specific serological screening tests – TTG- IgA tissue transglutamase antibodies and endomysial antibodies
FBC - usually anaemic due to malabsorption Inflammaotry markers (CRP, ESR) - normal
How do we Mx coeliac in kids?
• Gluten free diet – remove all products containing wheat, rye, barley from the diet • Refer to dietician for supervision • Life long • Yearly check-up, monitor growth and development
• If presenting <2y then gluten challenge later in
childhood to demonstrate continuing susceptibility – and check serology
Parent complains her toddler is having episodes of loose stools. The Child is well and thriving – no precipitating dietary factors and normal examination. What is the Dfx? Mx?
Toddler diarrhoea
Relieve symptoms with increased fiber and fat in diet – whole milk, yoghurts, cheeses
• Avoid fruit juice and squash
How does ulcerative colitis present and how is it ivx?
- Classic presentation is rectal bleeding, diarrhea, abdo pain
- weight loss and growth failure +/- erythema nodusum, arthritis
Ix:
- FBC – Hb,WCC, Platelets
- Anaemia, raised wcc + platelets - Stool microbiology investigation
- Raised faecal calprotectin = presence of inflammation in IBD (not accurate/used if <18)
- rule out infectious colitis - Endoscopy + Biopsy:
- histological features
- Continuous colitis extending from rectum proximally
- In children, 90% have pancolitis
- Histology → mucosal inflammation, crypt damage (abscesses, loss, architectural distortion) and ulceration
- small bowel imaging to check extra-colonic inflammation (Crohn’s) is not present
How we Mx coeliac? Complications?
- Aminosalicylates (mesalazine or balsalazide) for induction and maintenance
- +/- topical steroids if confined to rectum/sigmoid
• If extensive or aggressive→add systemic
steroids and immunomodulatory therapy
(azathioprine)
• If severe fulminating disease→consider
colectomy with ileostomy or ileorectal pouch
- Increased risk of adenocarcinoma of colon
- Increased risk of toxic megacolon
• Regular colonoscopy screening from 10y post
diagnosis
How does Hirschsprung disease present?
Clinically:
• Presents in the neonatal period with intestinal obstruction, failure to pass meconium within first 24h of life (basically they pass it AFTER 48h)
Normally, 90% of babies pass their first meconium within 24 hours, and 99% within 48 hours.
• Leads to development of abdo distension, bile-
stained vomiting
• Classically explosive passage of liquid and foul
stools (particularly after rectal examination)
• May present later in life with severe, life-
threatening Hirschsprung enterocolitis during
first few weeks (commonly Clostridium difficile)
• Or later with chronic CONSTIPATION and abdo
distension
• RF: Down syndrome Male!!
What is the aetiology of Hirschsprung?
complications ?
• Most commonly diagnosed in first year of life
• Absence of ganglion cells from myenteric (Auerbach) and submucosal plexus (miessner's) of the distal/large bowel
→ this means loss of parasympathetic/motor innervation to the segment so absence of peristalsis
causes a narrow-contracted segment of bowel
- Extends from the rectum for a variable distance proximally, ends in dilated colon
- 75% is rectosigmoid only
complications: megacolon, bowel obstruction, intestinal perforation
How is Hirschsprung ivx?
- AXR used initially, but is non-specific → can ID if colon or small bowel (will see dilated loops of bowel and constricted segments too)
- Contrast enema → contracted distal bowel and dilated proximal bowel with demonstration of transition zone in between
• Definitive diagnosis with Punch biopsy/ suction rectal biopsy!!!
→ confirms diagnosis → demonstrate absence of ganglion cells with presence of large acetylcholinesterase positive nerve trunks
How is Hirschsprung managed?
prognosis?
First do -> • Initially, bowel irrigation aka rectal washout; with saline
- is the short term rx for constipation
• Definitive management is surgical:
- Anorectal pull-through
- affected loop of bowel is pulled out and bowel is anastomosed
- can be done if child is well or newborn - Initial stoma/colostomy
- done if child is too unwell for surgery
- once they stabilise / feel better, corrective surgery can be arranged
• IV fluids and ABX (Metronidazole) if presence of
enterocolitis
prognosis: ongoing constipation in 7%
What is the aetiology of necrotising enterocolitis?
Unknown but risk factors include: premature, LBW
Most common surgical emergency in newborn babies
How does necrotising enterocolitis present? What will ivx show?
Preterm neonates in the first 2 weeks of life!!!
• Feeding difficulties • Abdo distension, altered stool pattern • Bloody stool and bile-stained vomiting Abdominal erythema/ discolouration- if perforation Failure to thrive
• Palpable abdo mass or ascites
See staging card for more signs/ sx
Late finding:
• Associated → bradycardia, lethargy, shock, apnoea, respiratory distress
Lactate can rise if severe
Ix:
- Clinical diagnosis
- Dx confirmed by AXR, the finding that is seen will determine the STAGE
- Arterial blood gas and bloods (coagulation panel) will help with staging too when signs of compromise eg if DIC seen
How is necrotising enterocolitis Mx? Complications?
Decompress bowel with NG tube
• IV fluids, nil by mouth
TPN - orogastric tube, IV Abx for 10-14d using local guidelines:
vancomycin and tazocin (g+- cover) - NICU
o Ampicillin/Gentamicin or Cefotaxmine + Metronidazole/Clindamycin - notes
Note if not severe, abx + nbm can resolve it
If patchy, they try not to use surgical methods.
• If they do not respond, or if perforation or necrotic bowel is suspected (free air in AXR) → surgical intervention (needed in 20-40%), open laparotomy
+ resection of necrotic bowel + creation of stoma
Complications: multi organ failure and death
What condition is clinically indistinguishable from appendicitis? Mx?
Mesenteric adenitis - often preceded by sore throat. Usual organism - Yersinia enterocolitica. Not just RIF
DX can only be made definitively when large mesenteric lymph nodes are seen at laparoscopy (w/ normal appendix)
Do bloods to differentiate
Mx:
Pain relief, will go in few days
Sometimes can use abx
What is the staging system for necrotising enterocolitis? What are the signs and sx in each stage?
And what do ivx show?
Bells staging
Stage 1:
Mild intestinal signs inc haematochezia and possibly abdominal distension, emesis.
systemic disease
Normal or non specific radiological signs - distension, mild ileus.
Stage 2:
Moderate intestinal signs inc absent bowel sounds, ileus, pneumatosis intestinalis (bowel wall gas)
AXR: portal venous gas
Lab tests: thrombocytopenia, metabolic acidosis
Stage 3:
3a - bowel intact, Hypotension, bradycardia, apnoea, peritonitis. AXR - portal venous gas.
3b - bowel peroration. AXR - Pneumoperitoneum (extraluminal gas)
Neutropaenia Metabolic (and respiratory) acidosis and DIC