Surgery Flashcards
part of bowel most likely to be affected by ischaemic colitis
splenic flexure
thumbprinting at splenic flexure
ischaemic colitis
part of bowel usually affected by mesenteric ischaemia
small bowel
usually embolism of SMA
Usual ABPI in diabetic
> 1.2 - causes calcification
Ix of mesenteric ischaemia
lactate
test to confirm H. pylori eradication
Urea breath test
who gets Hep A
travelers
transmission of Hep A
faecal - oral
is there a vaccine for Hep A?
Yes
Ix of Hep A
clotted blood for serology
Hepatitis that leads to chronic infection
Hep B
Hep C
transmission of Hep B
sex
mother - to - child
blood
HBsAg - what does it indicate
earliest marker of infection
is there a vaccine for Hep B?
yes
does vaccination against Hep B result in +ve HBsAg
no!!
Anti-HBsAg - what does it indicate
recovery
absence of infectivity
further immunity from Hep B
HBeAg - what does it indicate
+++ infectious
Anti-HBcAg (IgM) - what does it indicate
recent acute infection
Anti-HBcAg (IgG) - what does it indicate
with +ve HBsAg = chronic Hep B infection
with -ve HBsAg = infection in the remote past
autoantibodies in autoimmune hepatitis
Type 1 = ASMA, ANA
Type 2 = AMA
transmission of Hep C
sex
mother - to - child
blood
what other type of Hepatitis is hep D found with
Hep B
transmission of Hep E
faecal-oral
Where does Hep E come from
animals
is there a vaccine for Hep E?
no
Mx autoimmune hepatitis
short term Tx (<6m):
corticosteroid (pred)
long term Tx (>6m):
corticosteroid + immunosuppression
Mx alcoholic hepatitis
- prednisolone
2. pentoxyphylline
Mx of hep B
- pegylated interferon-alpha
2. tenofovir or entecavir
causes of acute pancreatitis
‘GET SMASHED’
G = gallstones E = ethanol T = trauma
S = steroids M = mumps A = autoimmune S = scorpion bites H = hypercalcaemia/hyperparathyroidism E = ERCP D = drugs
drugs causing pancreatitis
mesalazine
azothioprine
Ix pancreatitis
- serum lipase/amylase
- CT (gold standard)
- CXR - to rule out other causes
complications of pancreatitis
peripancreatic fluid collections pseudocysts pancreatic necrosis abscess haemorrhage
presentation of chronic pancreatitis
dull abdo pain, worse 30mins after eating
radiates to back
steatorrhoea
diabetes mellitus
Ix chronic pancreatitis
gold standard = CT
also - pancreatic enzymes, HbA1c, ultrasound
location of most pancreatic ca
head of the pancreas
presentation pancreatic ca
painless jaundice (due to compression of the CBD)
anorexia
wt loss
steatorrhoea
Trousseau’s sign (clots in superficial veins in uncommon sites)
Ix pancreatic ca
Gold standard = pancreatic protocol CT
tumour marker pancreatic ca
ca 19-9
Mx pancreatic ca
surgery candidate:
Whipple’s procedure - pancreaticoduodenectomy + adjuvant chemo
non-surgical candidate:
ERCP + stenting
presentation of colonic polyps
incidental finding on qFIT - most common
- rectal bleeding
- mucus discharge
- tenesmus
- change in bowel habit
Mx of colonic polyps
colonoscopy +/- polypectomy
what type of ca is the majority of colorectal ca
adenocarcinomas
genetic conditions predisposing to colorectal ca
Familial Adenomatous Polyposis (FAP)
- > 100 polyps
- early onset
- autosomal dominant
- ass. with thyroid ca
Hereditary Non-Polyposis Colorectal Ca (HNPCC) (Lynch synd)
- < 100 polyps
- late onset
- autosomal dominant
- ass. with endometrial and gastric ca
how often are people screened in Scotland for colorectal ca
ever 2 years aged 50-74 y
presentation of colorectal ca
depends on site.
L side =
bleeding/mucus PR, altered bowel habit, tenesmus, mass PR
R side =
wt loss, anaemia, abdo pain
screening test for colorectal ca
QFit
tumour marker colorectal ca
CEA
Ix colorectal ca
- Colonoscopy
- CT colonography
- Double contrast barium enema
staging - CT chest/abdo/pelvis
dukes classification of colorectal ca
A = confined to mucosa B = invading bowel wall C = lymph mets D = distant mets
Mx colorectal ca
stage I - III:
colonic resection/colectomy + resection of regional lymph nodes
stage IV:
evaluate whether mets are resectable
if not - palliative
what nodes do colorectal ca spread to
mesenteric nodes
distant mets for colorectal ca
liver
Mx of rectal ca
anterior resection
or
abdomino-perineal excision of rectum
hartmann’s procedure
- surgical resection of recto-sigmoid colon
- close of anorectal stump
- end colostomy
what is diverticular disease
presence of asymptomatic outpouchings of the gut wall
most common location of diverticular disease
sigmoid colon
cause of diverticular disease
lack of dietary fibre - weak gut wall - mucosal herniation
presentation diverticulitis
LIF pain
pyrexia
high WCC
generalized peritonism
Ix diverticular disease
colonoscopy
Ix diverticulitis
CT abdomen
Mx symptomatic diverticular disease
dietary modification = fibre supplements
Mx diverticulitis
analgesia + oral or IV Abx
Mx recurrent diverticulitis
colectomy
cause of pseudomembranous colitis
c. diff
presentation of pseudomembranous colitis
recent Hx of Abx use diarrhea prolonged hospitalization/nursing home resident abdo pain fever n+v
Mx pseudomembranous colitis
Non severe = Metronidazole
Severe = Vancomycin + Metronidazole
cause of ischaemic colitis
low flow in the IMA
presentation ischaemic colitis
lower left abdo pain +/- bloody diarrhea
tenderness
Mx ischaemic colitis
conservative - most resolve spontaneously
if gangrenous - resection + stoma
complications of ischaemic colitis
toxic megacolon
microscopic colitis
radiative colitis
presentation of microscopic colitis
chronic, watery diarrhoea
presentation of acute mesenteric ischaemia
+++ pain
biochem:
acidotic BG
increased lactate
increased WCC
g/s diagnostic Ix mesenteric ischaemia
CT angiogram
Mx acute mesenteric ischaemia
bowel resection
- re-anastomose if poss
- if not, stoma
presentation of chronic mesenteric ischaemia
post-prandial abdo pain wt loss (eating hurts0 upper abdo bruit \+/- PR bleeding
Mx chronic mesenteric ischaemia
surgery - pros v cons, ongoing risk of infection
causes of large bowel obstruction
colorectal ca
sigmoid volvulus
caecal volvulus
strictures - diverticula, inflammatory
sigmoid volvulus on AXR
coffee bean appearance
caecal volvus on AXR
fetal appearance
presentation large bowel obstruction
colicky abdo pain
abdo distension
‘tinkling bowel sounds’
failure to pass faeces
Ix large bowel obstruction
- AXR (haustration - do not cross lumen’s width)
2. CT
Mx large bowel obstruction is signs of strangulation
straight to theatre - laparotomy + resection of bowel
Mx large bowel obstruction if no signs of strangulation
drip + suck
NBM NG tube (suck - to decompress bowel) IV fluids (drip)
Mx fissure-in-ano
- conservative - increase fibre and fluids, bulk forming laxatives
- topical GTN or Diltiazem
- Botulinum toxin A
- Surgery
how is the course of a fistula-in-ano predicted clinically
Goodsall Rule:
if posterior to transverse anal line - curved course
if anterior to transverse anal line - straight course
how is the course of a fistula-in-ano visualised
MRI
Mx rectal prolapse
surgery - rectopexy (abdo approach), or perineal approach
stomas that are spouted
small bowel stomas
stomas that are flat
large bowel stomas
what is a loop stoma
entire loop of bowel is brought through one abdominal incision, with both the proximal and distal openings exteriorized in the same sit
what is an end stoma
one end of the colon is brought through the abdominal incision and stitched to the skin
use of a loop ileostomy
to defunction the colon e.g. following rectal ca surgery
use of an end ileostomy
following complete resection of the colon
use of an end colostomy
if anastomosis of the colon is not achievable
use of a loop colostomy
defunctioning of a distal segment of colon
cause of biliary colic
stone lodged in CBD
presentation biliary colic
intermittent RUQ pain
worse on eating fatty foods
no fever