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MRCP 1 > Gastro > Flashcards

Gastro Flashcards

1
Q

Paraffin laxatives are the laxative of choice for use in “body packer” T/F

A

F - they increase the risk of rupture of the package containing the drugs

Note: whole bowel irrigation with polyethylene glycol can be used if there are no signs of drug-associated toxicity, endoscopy for packages in the stomach can also be used. CT > xray for detection of the packages

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2
Q

Kayser-Fleischer rings are associated with what disease?

A

Wilson disease classically

Also seen in isolation in primary biliary cirrhosis and cirrhosis of unknown aetiology

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3
Q

Inserting a g tube decreases the risk of reflux T/F

A

F it increases the chance of reflux or increasing the chance of worsening the disease

Note: in a child with severe reflux who needs a g tube they should get a fundoplication too

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4
Q

Reducing substances in the stool of 0.25 - 0.5% are indicative of carbohydrate malabsorption. T/F

A

F - 0.25 - 0.5% are SUGGESTIVE of the disease; > 0.75% are indicative of the disease

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5
Q

Alkaline stool is indicative of carb malabsorption even in the absence of reducing substances T/F

A

F- acidic stools pH < 5.5 (even in absence of reducing substances)

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6
Q

What is the gold std of diagnosis of carb malabs?

A

Endoscopy + biopsy of small bowel mucosal disaccharidases (rarely actually used)

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7
Q

In the hydrogen breath test an early peak can be due to small intestine bacterial overgrowth. T/F

A

True (peak can also be caused by carb malabs)

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8
Q

Macroscopic finding on endo for UC vs Crohn’s

A

UC - friable mucosa and ulcers, interspersed w/areas of regeneration
Crohns - inflamed mucosa, aphthous ulcers, fissures, cobblestoning and strictures

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9
Q

Features of chronic giardiasis infection and its treatment

A

Symptoms of malabs and nutrient deficiency, Suspect in person w/hx of travel
Metronidazole

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10
Q

Treatment of intestinal lymphangiectasia

A

Dietary - high protein, very low long chain TG diet (abs by lymphatics) with medium-chain TG supplement (not absorbed by lymphatics)

High protein to make up for losses

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11
Q

Features of intestinal lymphangiectasia

A

Dilated lymphatic vessels which burst and leak lymphatic fluid into the gut –> protein loss, diarhoea and hypoproteinaemic oedema

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12
Q

What are monogen, caprillon and liquigen

A

MCT supplements, 1st 2 are formulas

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13
Q

The onset of emesis/reflux after 6 months old or persistent after one year is a red flag sign T/F

A

T

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14
Q

Aetiology of Kwashiorkor?

A

Protein deficiency with adequate calorie intake

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15
Q

In Kwashiorkor there is atrophy of muscle and subcutaneous tissue T/F

A

F - the subcut tissue/adipose tissue is spared.

Other features: localised or generalised oedema, hepatomegaly due to fatty infiltration of the liver, sparse easily pluckable hair, hyper pigmented hyperkeratosis and macular rashes, atrophied tongue and lymphatics

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16
Q

What is marasmus?

A

Severe calorie deficiency and body weight less than 60%.

Note: there is excess loss of subcut tissue and muscle

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17
Q

Coeliac disease is assoc with hyposplenism T/F

A

T

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18
Q

Paralytic ileus is a manifestation of CF T/F

A

F - patients can have mec ileus, paralytic ileus when there is no physical obstruction but occurs secondary to dysfunction of the nerves and muscles of the intestine (eg post OP)

Other GI manifestations of CF - rectal prolapse , ileal atresia, neonatal hepatitis, pseudo bartter syndrome

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19
Q

What is the most common age for rectal prolapse?

A

Most common in preschool age group, < 4 yr

Majority of cases are in first year of life

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20
Q

What is the mgmt of rectal prolapse?

A

1st line is conservative: tx of underlying cause and reduce straining (dietary advice + short course of laxatives)
Surg mgmt is occasionally required for some resistant or recurrent prolapses or if it assoc with pain or ulceration

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21
Q

Causes of rectal prolapse?

A

Idiopathic
CF (10% of cases of prolapses; 20% of pts with CF)
Increased intra abdominal pressure ( constipation, chronic cough, toilet training)
Diarrhoeal disorders: acute infection or malabs
Rectal polyps
Malnutrition/anorexia
Child abuse

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22
Q

What finding on upper GI imaging is diagnostic of mal rotation?

A

Normally the duodenal-jejunal flexure should be to the LEFT of the transverse process of L1 vertebrae at the height of the pylorus.
Flexure seen anywhere else depicts mal rotation

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23
Q

In infants with reflux what % will be symptoms free by 1 yr?

A

90%

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24
Q

Surgical mgmt of constipation?

A

Appendicostomy/MACE

Used for anterior enema

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25
Q

What is the risk of recurrence of appendicitis in a pt managed conservatively for an appendix mass?

A

Roughly 17%

Interval appendicectomy is controversial

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26
Q

What is the initial surgical mgmt of a type A esophageal atresia?

A

Laparotomy and open gastrostomy

Need to establish enteral feeds before a primary anastomosis at 3-6 months.

Note: lack of gas in the abdo indicates a pure TEF

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27
Q

Commonest cause of hepatitis in childhood?

A

Hep A

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28
Q

What two criteria must be present for a child >12 to be started on orlistat?

A
  1. Must have failed lifestyle, behavioural, dietary and exercise interventions
  2. Must have medical co morbidities secondary to their obesity - ortho, sleep apnoea or severe psychological issues
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29
Q

Typical presentation on juvenile polyp?

A

Present around 2-6 yrs with bright red painless blood per rectum

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30
Q

Double bubble is the classic xray finding of what pathology?

A

Duodenal atresia

Note: will also see an absence of distal gas
In a neonate gas should be seen in the stomach immediately after birth, ileo-caecal valve by 6 hours and rectum by 24 hours. In malrotation will see double bubble and gas distally

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31
Q

Lab abnormalities in pyloric stenosis?

A

Met alk with hypoK and hypoCl

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32
Q

Rose thorn ulcers in barium enema what disease?

A

Crohns disease

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33
Q

Pseudopolyps UC or Crohns?

A

UC

As is red-raw mucosa and evidence of colonic dilatation

34
Q

Dietary fiber and increased fluids are the first line treatment of idiopathic constipation T/F

A

F - these changes should be encouraged but will also need laxatives

35
Q

A + pANCA is more common in Crohns or UC?

A

UC (> 70%)

Crohns < 10%

36
Q

How should malrotation be diagnosed?

A

Upper GI contrast

Note: barium enema is not as reliable

37
Q

Most cases of duodenal atresia occur as isolated abnormalities T/F

A

T

38
Q

In a pt with LFTs significant for an elevated alk phos only what lab test can help differentiate etiologies?

A

PTH

DDx: rickets (elevated PTH) and transient hyperphosphatasia (normal PTH)

39
Q

Patients with HLA + IBD are more likely to have other autoimmune aetiologies T/F

A

T

40
Q

What is the typical drug of choice for treatment of shigella infection?

A

Quinolones, not treatment only indicated in severe cases (ie if bloody diarrhoea)

41
Q

Which shigella is assoc with HUS?

A

S dysenteria, especially type 1

42
Q

Which shigella is assoc with post infectious arthritis?

A

S flexneri

Note: esp in HLA B27 individuals

43
Q

Which shigella is more common in the developed world sonnei or flexneri?

A

Sonnei

Note this also causes the mildest form of infection

44
Q

When does type 1 Crigler Najjar syndrome typically present? What type of hyperbili is it?

A

Typically presents in first few days of life as a severe unconjugated hyperbili. Tx is phototherapy and plasmapheresis

Note: type 1 tends to present later and is treated with phenobarb

45
Q

Is gilbert syndrome causes what type of hyperbili?

A

Unconjugated

Note: unconjugated bili is not excreted in the urine

46
Q

Which type of bilirubin is excreted in the urine

A

Conjugated

47
Q

What is the first line treatment of crohns disease? Are there any exceptions?

A

Polymeric diet > Elemental diet

Polymeric is better tolerated orally than elemental so usually try this first

If there is rectal disease iv steroids is first line

48
Q

In infant has pale stools and dark urine, conjugated hyperbili what is the next step in mgmt? Organise a HIDA scan or immediate referral to nearest liver unit?

A

Immediate referral

Should get specialist eval prior to HIDA scan

49
Q

Possible complications of gastro-oesophageal reflux which does not resolve by 1 yr old

A

Recurrent otitis media
Pneumonia
Poor dentition
Apnoea

50
Q

In a patient with suspected coeliac disease but anti IgA tTC that are elevated but less than 10 times the upper limit of normal what is the next step in mgmt?

A

Duodenal biopsy

Note: if elevated > 10 times the upper limit of normal can do a biopsy OR further bloods tests (if + anti IgA endomysial and either HLA DQ2/DQ8 can confirm without biopsy)

51
Q

What is the most common cause of pancreatitis in children?

A

Idiopathic

52
Q

What substance is the most appropriate to measure in a faecal sample to confirm diagnosis of protein losing enteropathy?

A

Alpha 1 antitrypsin

Note: if thinking specifically of IBD can check calprotectin

53
Q

Triangular cord sign on ultrasound is seen in what pathology

A

Biliary atresia

Note: represents the fibrous ductal remnant of the extrahepatic bile duct

54
Q

Which is the most common type of tracheo oesophageal fistula?

A

Type C (atresia with distal fistula)

55
Q

Which type of TOF does not have bowel gas?

A 
Type A (isolated atresia)
Type B (atresia with proximal fistula)
56
Q

Bloody diarrhoea is more common in the presentation of UC or crohns?

A

UC

57
Q

How much small bowel is a neonate born with? If a patient has a small bowel resection what is the cut off under which they would require TPN?

A

Normal 250cm

Less than 100cm an infant will require TPN.

58
Q

Buzz word: stools that get looser as the day progresses

A

Toddler’s diarrhoea

59
Q

What age is associated with a poor prognosis in HUS?

A

Age > 5

60
Q

What type of pathogen is associated with a poor prognosis in HUS?

A

Non-shiga toxin HUS

61
Q

Involvement of which arteries is associated with a poor prognosis in HUS?

A

Involvement of mediums sized arteries.

62
Q

Prolonged oliguria or anuria is associated with poor prognsis in HUS T/F

A

T

63
Q

Severe hypotension is assoc with poor prognosis in HUS T/F

A

F - severe HTN, especially late onset is assoc with poor prognosis

Other factors: severity of CNS symptoms, persistent consumption of clotting factors, extensive glomerular involvement (> 80%)

64
Q

Lab findings and pathology in Vit D dependent rickets type I vs type II

A

Type I: 1a hydroxylase def –> cannot convert 25 -OH vit D to 1, 25. Hence will have a low 1,25

Type II: absent receptors –> high 1,25

65
Q

Dubin Johnson is associated with what type of hyperbili?

A

Conjugated

Hence it is excreted in the urine

66
Q

Rotor is associated with what type of hyperbili?

A

Conjugated

67
Q

When is the peak age of HUS?

A

1-2 yrs old

68
Q

Incomplete obliteration of the vitelline duct leads to what pathology?

A

Meckel’s diverticulum

69
Q

Risk factors for pyloric stenosis?

A 
Maternal smoking
Eldest child
IUGR
Pre term
Bottle feed
70
Q

Villious atrophy is a specific finding in coeliac disease T/F

A

F - it is found in coeliac disease but it is non specific. Also seen in Crohns, lymphoma, eosinophilic gastroenteritis, giardiasis, tropic sprue

71
Q

4 typical features of coeliac disease on biopsy

A
  1. Intra epithelial lymphocytosis
  2. Lamina propria plasma cell infiltrate
  3. Crypt hypertrophy
  4. Subtotal or complete villous atrophy
72
Q

Is there any dietary intervention that may reduce the duration of crying in infantile colic?

A

Yes, there is some evidence for using whey hydrolysate milk instead of regular cows milk formula

73
Q

Excessive iron intake can reduce Zn absorption and vice versa T/F

A

T - they both use transferrin for transport

74
Q

Mgmt of GI reflux in an otherwise well infant after a breastfeeding assessment has been carried out.

A

Alginate trial for 1-2 weeks

75
Q

C/I to enema in investigation of intusseception?

A

Signs of peritonitis or perforation, including currant jelly stool

76
Q

Presentation of a choledochal cyst in an infant?

A 
RUQ mass (not always present but high suggestive of the diagnosis when it is)
Elevated conjugated bili and jaundice
Can have severe liver dysfunction and hence ascites and coagulopathy
77
Q

In coeliac disease is CRP typically elevated or normal?

A

Typically normal

Note: this can help differentiate between IBD in an exam

78
Q

Hypoglycaemia is a recognised complication of refeeding syndrome T/F

A

F - hyperglycaemia is a known complication, it is caused by inadequate insulin supply.

79
Q

Treatment of cows’ milk protein allergy?

A

If formula feed - switch to amino acid based formula (note hydrolyzed formula may still have a small amount of cows milk protein)
If breast feed - mother to go a strict cow milk free diet

80
Q

Which is more likely to affect growth UC or Crohns?

A

Crohns

81
Q

Dietary mgmt of a chylothorax?

A

High amount of MCTs (monogen or liquigen) + low fat diet

Avoid LCTs, using MCTs bypasses the lymphatic system

82
Q

Dietary mgmt of MCADD

A

Normal diet but should not go a long time in between eating, frequent drinks contains glucose polymer and restriction of fat when unwell

MRCP 1 (21 decks)

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