General Surgery Flashcards
Causes of appendicitis
- Faecolith = stone made of faeces
- Lymphoid hyperplasia
- Filarial worms
Presentation of appendicitis
- Abdominal pain in umbilical region that migrates to right iliac fossa (McBurney’s point) after a few hours
- Loss of appetite
- Nausea and vomiting
- Constipation (occasionally diarrhoea)
- Tenderness in RIF (McBurney’s = 2/3rds of way from umbilicus to ASIS) Guarding to RIF
- Rebound tenderness and percussion tenderness = peritonitis
- Tachycardia, fever
- Rovsing’s sign = press on LIF, hurts on RIF
- Psoas sign = pain on extending hip if retrocaecal appendix
- Cope sign = pain on flexion and internal rotation of R hip if appendix in close relation to obturator internus
Gold standard investigation for appendicitis
CT = reduces risk of removing healthy appendix
Investigations to rule out other pathology similar to appendicitis
Pregnancy test
Urinalysis
Pelvic/abdo US
Management of appendicitis
- Appendicectomy laparoscopically
- IV antibiotic pre-op to reduce wound infections = IV metronidazole/ cefuroxime
- Analgesia
- Resuscitation with IV fluids
Complications of appendicitis
- Perforation
- Appendix mass = When inflamed appendix becomes covered in omentum
- Appendix abscess = if mass fails to resolve but instead enlarges and patient gets more unwell
- Early surgical complications = surgical site infection, wound haemotoma
- Late surgical complications = SBO due to adhesion, incisional hernia
- Anaesthetic risks
- Removal of normal appendix
- VTE
- Peritonitis from ruptured appendix
What is acute mesenteric ischaemia?
Sudden decrease in blood supply to the bowel usually caused by an embolism in the superior mesenteric artery
Risk factors for acute mesenteric ischaemia
- Atherosclerosis
- Smoking
- COPD
- Arrhythmia (AF)
- Clotting disorders
- Medications = OCP, migraine
- Cocaine
Presentation of acute mesenteric ischaemia
- Acute severe sudden onset abdominal pain
- Diarrhoea
- Weight loss
- Melaena
- Rapid hypovolaemia = shock
- Pale skin, weak rapid pulse, reduce urine output, confusion
- Out of keeping with physical exam findings
Investigations for acute mesenteric ischaemia
- Bloods
o High lactate
o Raised Hb and WCC
o Persistent metabolic acidosis - CT/MRI angiography = Provides non-invasive alternative to simple arteriography
- Colonoscopy
Management of acute mesenteric ischaemia
- Immediate laparotomy usually required esp if signs of advanced ischaemia
- Fluid resuscitation
- Antibiotics = IV gentamicin and IV metronidazole
- IV heparin to reduce clotting
Complications of acute mesenteric ischaemia
- Septic peritonitis = Due to perforation
- Systemic inflammatory response syndrome progressing into multi-organ dysfunction syndrome
- Gangrene
- Scarring and narrowing of intestines
Risk factors for ischaemic colitis
- Atherosclerosis
- Drugs = contraceptive pill, antihypertensive, vasopressin, nicorandil drug
- Surgery = Cardiac bypass, aortic dissection and repair, aortoiliac reconstruction
- Vasculitis = SLE, sickle cell disease, polyarthritis nodosa
- Coagulation disorders thrombophilia
Presentation of ischaemic colitis
- Sudden onset lower left side abdominal pain
- Passage of bright red blood with/out diarrhoea
- Shock = Pale skin, weak rapid pulse, reduce urine output, confusion
- Evidence of underlying cardiovascular disease
Investigations of ischaemic colitis
- Urgent CT scan to exclude perforation
- AXR = thumbprinting
- Flexible sigmoidoscopy = Biopsy shows epithelial cell apoptosis
- Colonoscopy and biopsy
o Only done after patient has fully recovered to exclude stricture formation at site of disease
o Confirm mucosal healing - Barium enema = Thumb printing of submucosal swelling at splenic flexure
Management of ischaemic colitis
- Fluid replacement
- Antibiotics
Complications of ischaemic colitis
- Gangrenous ischaemic colitis
o Presenting with peritonitis and hypovolaemic shock
o Requires prompt resuscitation following by surgical resection of affected bowel and stoma formation - Inflammation
- Ulceration
- Haemorrhage
Epidemiology of oesophageal tumour
- SCC (upper 2/3) = common in China, Africa, Iran
- Adenocarcinoma (lower 1/3) = western countries
Risk factors for oesophageal tumour
- Diets low in fibre, carotenoids, folate and vit C
- Alcohol
- Smoking
- Obesity = increased reflux
- GORD/ Barrett’s oesophagus
- Achalasia
Presentation of oesophageal tumour
- Progressive dysphagia
o Initially difficulty swallowing solids but then liquids follows within weeks
o If dysphagia to solids and liquids from start = benign - Weight loss and Anorexia
- Hoarseness and cough = upper 1/3
- Pain
- Difficulty in swallowing saliva, coughing and aspiration into lungs = oesophageal obstruction
- Vomiting
- Sx of GI blood loss
- Lymphadenopathy
Investigations of oesophageal tumour
- Upper GI endoscopy (Oesophagoscopy) with biopsy
- Barium swallow = See strictures
- Endoscopic US
- CT scan/MRI/PET for tumour staging
Management of oesophageal tumour
- Surgical resection
o if tumour has not infiltrated outside oesophageal wall
o Combined with chemotherapy before surgery +/- radiotherapy - Treatment of dysphagia
o Endoscopic insertion of expanding metal stent across tumour to ensure oesophageal patency
o Laser and alcohol injections = tumour necrosis and increase lumen size
Epidemiology of gastric tumours
- Incidence increases with age = peak at 50-70 yrs
- Highest incidence in Eastern Asia, Eastern Europe and South America
Risk factors for gastric tumours
- First degree relative with gastric cancer = CDH1 gene
- Dietary factors High salt and nitrates, Pickled food
- Alcohol
- Smoking
- Helicobacter pylori infection
- Loss of p53 and APC genes
- Pernicious anaemia = accompany atrophic gastritis
Protective factors for gastric tumours
Non-starchy veg, fruit, garlic and low salt
Types of gastric tumours
- Intestinal/ type 1
o Well-formed and differentiated glandular structures
o More likely distal stomach and occur in patients with atophic gastritis - Diffuse/ type 2
o Poorly cohesive undifferentiated cells
o Tend to infiltrate the gastric wall
o Can involve any part of stomach, especially cardia
Presentation of gastric tumours
- Epigastric pain = constant and severe
- Nausea and vomiting
- Weight loss and anorexia
- Dysphagia
- Dyspepsia (indigestion)
- Liver metastasis jaundice
- Anaemia = occult blood loss
- Metastases occur in bone, brain and lung
- Palpable lymph node in supraclavicular fossa (Virchow’s node) usually on left side
Investigations for gastric tumours
- Gastroscopy and biopsy
- Endoscopic ultrasound to evaluate the depth of invasion
- CT/MRI for staging
- PET scan to identify metastases
Management of gastric tumours
- Nutritional support
- Surgery and combination chemotherapy = Epirubicin and Cisplatin + 5-fluorouracil
- Post-op radiotherapy
Colorectal carcinoma risk factors
- Diet Low fibre, high red meat and sat animal fat, high sugar
- Colorectal polyps
- Alcohol and smoking
- Obesity
- Adenomas
- Ulcerative colitis
- Familial adenomatous polyposis
- Lynch syndrome (HNPCC)
Protective factors for colorectal carcinoma
Vegetables, garlic, milk, exercise, low-dose aspirin
Metastases of colorectal carcinoma
Liver and lung
Presentation of colorectal carcinoma
- Closer cancer to outside more visible blood and mucus
- Right sided = asymptomatic, weight loss, abdo pain, Iron deficiency anaemia due to bleeding, Mass
- Left sided and sigmoid
o Change in bowel habit with blood and mucus in stools
o Alternation constipation and diarrhoea
o Colicky abdominal pain - Rectal carcinoma Rectal bleeding and mucus
o When cancer grows = thinner stools and cramping rectal pain
Emergency presentation of colorectal carcinoma
Absolute constipation, Colicky abdominal pain, Abdominal distension, Vomiting
Investigations for colorectal carcinoma
- Colonoscopy with biopsy = removal of polyps
- MRI/CT chest, abdo, pelvis = determine spread
Screening test for colorectal carcinoma
Faecal immunochemical testing = screening
Tumour marker for colorectal carcinoma
CEA
Classification of colorectal carcinoma
Dukes
- A = limited to inner lining of bowel
- B = extension through muscle layer of bowel
- C = involvement of regional lymph nodes
- D = distant metastases
Management of colorectal carcinoma
- Surgery Only indicated if no metastasis
- Endoscopic stenting For palliation in malignant obstruction (Decreases need for colostomy)
- Radiotherapy Palliation for colonic cancer or used pre-op in rectal cancer
- Chemotherapy If Dukes C then give chemo post-op = reduce risk of death
Causes of acute upper GI bleeding
- Oesophageal
o Oesophageal varices
o Oesophagitis
o Cancer
o Mallory Weiss tear - Gastric
o Gastric ulcer
o Gastric cancer
o Dieulafoy lesion
o Diffuse erosive gastritis - Duodenal
o Duodenal ulcer
o Aorto-enteric fistula