Paeds 2 - GI, Liver, Renal Flashcards
What does dark green bile-stained vomit indicate?
Intestinal obstruction
What condition is indicated by projectile non-bilious vomiting in the first few weeks of life, up to an hour after feeding?
Pyloric stenosis
What condition is indicated by red-currant jelly stool?
Intussuception
What is the cause of gastro-oesophageal reflux in infants?
Inappropriate relaxation of the lower oesophageal sphincter as a result of functional immaturity
What is a possible complication of GO reflux?
Chest infection from pulmonary aspiration
Oesophageal strictures
Barrett’s oesophagus
Failure to thrive
How is refractory (no spontaneous resolution) GO-reflux treated?
Overnight oesophageal pH study - acid in oesophagus for more than 4% of the day
Thickening agents, small feeds, nurse upright (head up slope of 30 degrees and prone)
Gaviscon
Ranitidine
Domperidone (prokinetic drug)
Omeprazole
Nissen fundoplication
What is the cause of pyloric stenosis?
Hypertrophy of the pyloric muscle
Idiopathic
What metabolic abnormality is seen in patients with pyloric stenosis?
Hypochloraemic hypokalaemic metabolic alkalosis
What can be found on investigation in a patient with pyloric stenosis?
Test feed - visible gastric peristalsis, pyloric tumour
Abdo exam - pyloric mass (olive-like) in RUQ
USS - confirms or excludes diagnosis
What is the treatment of pyloric stenosis?
IV 0.45% saline, 5% dextrose, 20mmol/L K+ supplements
Withold feeds and empty stomach with NGT
Ramstedt’s pyloromyotomy
What presentation is characteristic of infant colic?
Paroxysmal inconsolable crying with knees drawn up
What is Meckel’s diverticulum?
Ileal remnant of the vitello-intestinal duct containing ectopic gastric mucosa or pancreatic tissue
What is the rule of 2s with Meckel’s diverticulum?
2% of the population 2 inches long 2 feet proximal to ileo-caecal valve 2 years of age onset 2 types of ectopic tissue 2% symptomatic
What is the symptom of Meckel’s diverticulum?
Painless severe rectal bleeding
How is Meckel’s diverticulum diagnosed?
Technetium scan - increase uptake by ectopic gastric mucosa
What is the GI anatomy in malrotation?
Caecum goes from RIF to right hypochondrium
SI has a narrow base (volvulus)
Duodenum covered by fibrous bands of Ladd
What is the presentation of intestinal obstruction in days 1-3 of life?
Dark green bilious vomiting
Abdo pain and distension
Blood and mucous in stools
Circulatory collapse
How is malrotation diagnosed?
Urgent upper GI contrast study
AXR - double bubble
What are the symptoms of appendicitis?
Anorexia, vomiting, pain initially central –> RIF
Tenderness and guarding over McBurney’s point
Fever
How is appendicitis diagnosed?
Abdominal X-Ray - faecoliths
Ultrasound - thickened appendix with increased blood flow
What is intussusception?
The invagination of proximal bowel into a distal segment
What is the most common location for intussusception?
Ileum passing into caecum through ileo-caecal valve
What are the risk factors for intussusception?
Viral infection leading to enlargement of Peyer’s patches (lymphoid hyperplasia)
Childhood leukaemia/small bowel lymphoma
What investigations are required in the diagnosis of intussusception?
Abdo exam - palpable sausage shaped mass
AXR - distended small bowel, absence of gas distally, outline of intussusception
AUS - target sign
What are the symptoms of intussusception?
Paroxysmal colicky episodes, refusal of feeds, bile stained vomiting, redcurrant jelly stool, abdo distension
Child falls asleep between episodes
What is the gold standard of treatment of intussusception?
Rectal air insufflation under fluoroscopic control
What is an abdominal migraine?
Functional abdominal pain and functional headaches. Can have vomiting
What is the eradication regime for h.pylori infection?
Amoxicillin/clarithromycin, metronidazole
What is the treatment of functional dyspepsia?
Hypoallergenic diet
What is the most common gasteroenteritis causing organism for under 2s?
Rotavirus
Blood in the stool signifies a bacterial cause for gastroenteritis, such as
E.coli
Campylobacter jejuni
Shigella
What are the complications of gastroenteritis in children?
Dehydration
Malnutrition
What is the management of a child with gastroenteritis?
Antidiarrhoeals and antibiotics not routinely used
Self resolution
When are antibiotics prescribed for gastroenteritis?
Sepsis
Extra-GI spread of infection
Malnutrition
Immunocompromised
What is post-gastroenteritis syndrome?
Following episode of gastroenteritis, intro of normal diet produces watery stools, and temporary lactose and dietary intolerances.
Why are infants at a greater risk for dehydration?
Greater surface area:weight ratio and greater insensible losses
What are the symptoms of dehydration in infants?
Decreased urine output Decreased consciousness Sunken fontanelle Dry mucous membranes Prolonged capillary refill Pale/mottled skin Cold extremities
What are the three degrees of dehydration in infants?
No clinically detectable dehydration (<5% body weight loss)
Clinical dehydration (5-10%)
Shock (>10%)
What is the most common type of dehydration?
Isonatraemic
Children with diarrhoea can suffer with what type of dehydration and why?
Hyponatraemic - they drink water so there is a greater net loss of Na than water
What is a consequence of hyponatraemic dehydration?
Water shifts from extracellular to intracellular compartment, increasing brain volume and causing seizures
What are the causes of hypernatraemic dehydration?
High insensible losses (high fever, hot environment)
How do you treat shock from dehydration?
Rapid infusion of 0.9% NaCl solution
What is the presentation of malnutrition?
Abnormal stools
Failure to thrive
Nutrient deficiencies
What are three causes of malnutrition
Biliary atresia
Short bowel syndrome
Exocrine pancreatic dysfunction
Coeliac disease
When is coeliac disease most likely to present?
8-24 months
How is coeliac disease diagnosed?
IgA, IgA tissue transglutaminase, anti-gliaden and endomysial antibodies
What vitamin deficiencies are most likely to be seen in coeliac disease?
Vitamin B12,
Iron
Folate
What is characteristic of coeliac disease in the small bowel?
Flat mucosa, villous atrophy, crypt hypertrophy
What are the signs and symptoms of Crohn’s disease?
Growth failure, abdominal pain, diarrhoea Delayed puberty Oral lesions Perianal skin tags Uveitis Erythema nodosum
What is the treatment of Crohn’s disease?
Glucocorticoid monotherapy for flares: prednisolone
Enteral nutrition if concerns about growth
What is the difference between Crohn’s disease and Ulcerative colitis?
Crohn’s - transmural inflammation mouth –> anus
UC - inflammation confined to colon (90% children pancolitis)
What are the red flags for constipation in children?
Sacral dimple Abdominal distension Decreased growth Abnormal lower limb neurology Perianal fistulae/abscess/fissures Fever
At what age should children have a comparable stool pattern to adults?
4 years
4/day in first week, 2/day by 1 year
How would you manage a child with constipation?
Fluid and diet advice
Osmotic laxative/movicol
If no effect, stop and add senna
What are the causes of constipation in babies?
Hirschprung's disease Anorectal abnormalities Hypothyroidism Hypercalcaemia Dehydration
Which large bowel nerve plexuses are missing ganglion cells in Hirschprung’s disease?
Myenteric and submucosal
What is the cause of Hirschprung’s?
Defect in the craniocaudal migration of neural crest cells in the first 12 weeks of gestation
What is the gold standard for diagnosis of Hirschprung’s?
Suction rectal biopsy to demonstrate absence of plexuses or large AChE positive nerve
How does Hirschprung’s disease present?
Failure to pass meconium, DRE produces watery stool
Bowel and abdo distension
Bile stained vomiting
Enterocolitis
How is Hirschprung’s disease treated?
Anastamose innervated bowel to anus
What is the main laboratory tool used to assess the kidneys and urinary tract?
PCr (plasma-creatinine ratio)
Then eGFR
What is an MCUG?
Micturating cystourethrogram - contrast introduced to bladder via urethral catheter to visualise anatomy
What is Potter syndrome and how is it caused?
Deficiency of amniotic fluid from renal agenesis or bilateral multicystic dysplastic kidney
How are most congenital renal conditions diagnosed?
Antenatal ultrasound
What is the most common inherited cystic kidney disease?
Autosomal dominant polycystic kidney disease - cysts on both kidneys fill with fluid and enlarge, compress the renal parenchyma and compromise function
What is the treatment of ADPKD?
RRT: dialysis or transplant
What is ARPKD?
Underdeveloped kidneys leading to neonatal death, or hypertension and haematuria in childhood
What is the cause of multicystic dysplastic kidney?
Failure of the union of the ureteric bud and nephrogenic mesenchyme.
What are the characteristics of multicystic dysplastic kidney?
Ureteric atresia, non functioning/no renal tissue with no connection to the bladder
Name two other congenital malformations of the kidney
Horseshoe kidney, duplex kidney
What is a risk factor for vesicoureteric reflux?
Family history
Why do children with VU reflux have recurrent UTIs?
Renal or ureteric scarring (especially if intrarenal reflux)
What is reflux nephropathy?
Shrunken, poorly functioning, scarred renal tissue from recurrent infection
When should you investigate for VUR and what would this entail?
Atypical/recurrent UTIs
Ultrasound
MCUG to diagnose
DMSA to look for renal scarring
How is VUR managed?
Prophylactic antibiotics
Endoscopic injection/surgery
What are three causes of primary nocturnal enuresis?
UTI
Polyuria
Faecal retention severe enough to cause bladder neck dysfunction