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int med 2024 > GI bleed > Flashcards

GI bleed Flashcards

1
Q

upper GI tract is

A

proximal to the ligament of trietz

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2
Q

ligament of Trietz

A

a fold of peritoneum that attaches the duodenojejunal flexure to the retroperitoneum
can be used as a landmark to distinguish the upper and lower GI tracts

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3
Q

lower Gi tract is

A

distal to the ileocecal valve

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4
Q

upper GI bleeding is bleeding from

A

eosophagus, stomach, duodenum (proximal to the ligament of trietz)

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5
Q

Lower GI bleeding is bleeding from

A

colon or rectum

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6
Q

small bowel bleeding is bleeding from

A

a source between the ligament of treitz and the ileocecal valve

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7
Q

overt GI bleeding

A

Gi bleeding that is visible in the form of hematemesis, melon, or hematochezia (including intermittant scant hematochezia)

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8
Q

causes of upper Gi bleeding

A

peptic ulcer disease (20-50% of cases)
eosophagitis
erosive gastritis and/or duodenitis
varices eg. gastric or eosophageal varicies
gastric astral vascular ectasia
dieulafoy lesion
angioma
telangiectasias
angiodysplasia
eosophageal cancer
gastric cancer
mallory weiss syndrome
hiatal hernias
boerhaave syndrome
foreign body ingestion
following open or endoscopic surgery
portal hypertensive gastropathy
coagulopathies

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9
Q

causes of LGIB

A

diverticular bleeding
colitis
proctitis
ulcers
haemorrhoids
intenstinal ischaemia
arteriovenous malformation
colorectal varices
colorectal cancer
anal cancer
colonic polyps
lower abdominal trauma
anorectal trauma
following open or endoscopic surgery
anal fissures
meckel’s diverticulum
etiology of lower GI bleeding in children
coagulopathies

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10
Q

risk factors for GI bleeding

A

NSAID use
antithrombotic use eg. antiplatelet therapy, anticoagulants
history of prior GI bleeding
older age

specifically for upper GI bleeding: H pylori infection, renal failure, especially in the first year of haemodialysis

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11
Q

coffee ground appearance of hematemesis

A

caused by coagulation and the presence of hematin, a dark pigment that forms when heme is oxidised by gastric acid in the stomach
most commonly caused by UGIB

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12
Q

melena

A

black tarry stool with strong offensive odour
caused by the presence of hemetin, a dark pigment formed by the oxidation of heme
in UGIB, heme is oxidised by gastric acid, in LGIB, it is oxidised by intestinal bacteria

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13
Q

hematochezia

A

passage of blood through the anus with or without stool
maroon, jelly like traces of blood indicate colonic bleeding
streaks of fresh blood indcate rectal bleeding

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14
Q

approach for initial management

A

obtain IV access for possible fluid resus and blood transfusion: two large bore peripheral IV catheters
order nill per mouth status
A-E assessment
consider intubation to protect the airway in patients with altered mental state or severe ongoing hematemesis
immediate hemodynamic support with management of haemorrhagic shock
consider anticoagulation reversal

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15
Q

immediate hemodynamic support should consist of

A

IV fluid resus with crystalloids
blood transfusion

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16
Q

blood transfusion for stable patients

A

follow a restrictive transfusion strategy
packed red blood cell transfusion if Hb is <7
a higher threshold may be considered in patients with preexisting cardiovascular disease or delays in endoscopy

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17
Q

empiric pharmacotherapeutic treatment for UGIB

A

prior to Endoscopy: consider erythromycin to improve visualization during EGD
benefit of preprocedural PPIs is unclear
if oesophageal variceal bleeding is suspected: start vasoactive therapy with octreotide or vasopressin and start antibiotic prophylaxis with caeftriaxone

18
Q

elevated BUN/Creatinine ratio in upper GI bleed

A

may be a sign of severe UGIB and is especially relevant in patients who present with an unknown source of bleeding eg. unstable patients with hematochezia).
BUN is elevated in UGIB due to intestinal absorption and metabolism of hemoglobin as well as decreased urea secondary to hypovolaemia

19
Q

issues on medical history suggesting UGIB

A

history of UGIB
known potential source of UGIB
- history of PUD
- hepatic cirrhosis, portal hypertension

20
Q

issues on medical history suggesting LGIB

A

history of LGIB
known potential source of LGIB
- diverticulitis
- colonic angiodysplaasia
- recent polypectomy

21
Q

approach to suspected UGIB

A

if hemodynamically stable
- endoscopy
if endoscopy is not diagnostic
- colonoscopy after bowel prep
- CT abdomen

22
Q

approach to suspected LGIB if hemodynamically unstable

A

if hemodynamically unstable: CTA
if CTA identifies source of bleeding,
proceed to catheter angiography or colonoscopy for endoscopic hemostasis

23
Q

approach to suspected LGIB if hemodynamically stable

A

non emergency colonoscopy after bowel prep
consider CTA for patients who cannot tolerate bowel prep or if there is high suspicion of active bleeding
tagged RBC scintigraphy may be ordered for patients with ongoing LGIB that can not be loclized with colonoscopy and CTA

24
Q

obscure Gi bleeding

A

overt Gi bleeding from an undetermined source that persists of recurs after a negative diagnostic evaluation

25
Q

approach to suspected small bowel bleeding

A

evaluate for small bowel bleeding in patients with obscure GI bleeding
CTA
video capsule endoscopy
consider further investigations as necessary
- advanced endoscopic evaluation: push enteroscopy, double balloon enteroscopy
- radiographic evaluation: CT enter-graphe, tagged RBC scintigraphy, Meckel scan

26
Q

interventional radiology - catheter angiography

A

indicated for ongoing severe LGIB in patients with hemodynamic instability refractory to resus
identification of an arterial source of UGIB on endoscopy
consider in patients with rebleeding despite endoscopic homeostasis
techniques: angioembolisation (preferred in faesible), or intraarterial vasopressin (if the source of bleeding is diffuse)

27
Q

endoscopic hemostasis

A

preferred intervention for most patients with ongoing bleeding or signs of recent bleeding on endoscopy
techniques: thermal coagulation, clip placement, band ligation, injection with epinephrine solution, topical sealants, polypectomy in case of bleeding polyp

28
Q

surgical hemostasis

A

may be considered in patients with onogoing Gi bleeding only in the following scenarios
- all other therapeutic options have failed
- refractory hemodynamic instability
techniques: surgical ligation of bleeding vessels, excision of susceptible mucosa, segmental bowel resection

29
Q

forms of intervention for hemostatic control

A
  • endoscopic hemostasis: preferred method for most patients with ongoing bleeding or signs of recent bleeding on endoscopy
  • interventional radiology (catheter angiography): consider in patients with ongoing bleeding despite endoscopic hemostass
  • surgical hemostasis: if all other therapeutic options fail
30
Q

occult GI bleeding

A

Gi bleeding that is not visible and can only be detected by faecal occult blood tests or seen on microscopy

31
Q

management of a positive FOBT

A

FBC, Fe studies
non emergency colonoscopy

32
Q

what is intermittant scant hematochezia

A

chronic, intermittant passage of a small amount of bloow from the rectum

33
Q

eatiology of intermittant scant hematochezia

A

hemorrhoids, anal fissures
colorectal cancer, colon polyps

34
Q

diagnostics for intermittent scant hematochezia for patients <40

A

for patients <40 without features of underlying malignancy or IBD, perform DRE and flexible sigmoidoscopy
these tests are sufficient to evaluate for haemarhoids and fissures

35
Q

when is colonoscopy indicated in scant intermittant haamatochezia

A

non diagnostic sigmoidoscopy
age >50 years
unexplained red flags for colorectal cancer or IBD eg. weight loss, altered bowel habits, iron deficiency anaemia
- other risk factors for colorectal cancer eg. history of colonic polyps or family history of colorectal cancer

36
Q

differential diagnosis

A

bleeding from upper respiratory tract eg. nocturnal nosebleeds: blood can be swallowed and vomited or appear as malaena
ingestible substances that can darken stool and resemble malaena eg. iron tablets, bismuth preparations
certain foods or drinks with red food colouring eg. licorice, soft drinks

37
Q

complications of GI bleed

A

haemorrhagic shock
hepatic encephalopathy (in patients with liver cirhhosis)
aspiration pneumonia

38
Q

why can GI bleed cause hepatic encephalopathy

A

hepatic encephalopathy is caused by inadequate elimination of metabolic products by the liver with subsequent accumulation of neurotoxic metabolites e.g ammonia. GI bleeding causes an increased amount of blood to be digested into protein, which increases ammonia concentrations and, subsequently, the risk of heptic encephalopathy

39
Q

why can GI bleed cause aspiration

A

commmonly seen in patients with massive UGIB (especially with oesophageal bleeding) and in patients with an aletred mental state eg. dementia, hepatic encephalopathy

40
Q
A

int med 2024 (22 decks)

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