Gastro missed out questions Flashcards
What mediates this - reflective relaxation?
Inhibitory noncholinergic nonadrenergic (NCNA) neurones of myenteric plexus
Where does the oesophagus start and intersect the diagphram
C5 - T10
Define Achalasia
Hypermotility of oesophagus due to loss of ganglion cells in Aurebach’s myenteric plexus in LOS wall
Leads to decreased activity of inhibitory NCNA neurones
CREST syndrome
- **Calcinosis- deposits of calcium in soft tissue
- Raynaud’s phenomenon- constriction of peripheral blood vessels, can lead to problems with hands
- Esophageal problems
- Sclerodactyly- thickening of digits of hands and toes
- Telangiectasia- dilated or broken blood vessels near surface of skin
What is LOS pressure increased by?
- Acetylcholine
- Alpha adrenergic agonists
- Hormones
- Protein-rich food
- Histamine
- High intraabdominal pressure
- PGF2alpha etc
What is LOS pressure decreased by?
VIP (vasoactive intestinal polypeptide)
- Beta adrenergic agonists
- hormones, dopamine
- NO
- PGI2
- PGE2
- chocolate
- acid gastric juice
- Smoking etc
Which regions of the hypothalamus detects change in osmolality?
- Organum vasculosum of the lamina terminalis (OVLT)
- Subfornical organ
What are the functions of angiotenisn II in the renin- angiotensin- aldosterone pathway?
Thirst
ADH production
Aldosterone production
Vasoconstriction
H2O retention via potassium excretion and sodium chloride absorption
What is the function of aldosterone in the renin- angiotensin - aldosterone pathway?
H2O retention via potassium excretion and sodium chloride absorption
Outline the regions in the hypothalamus involved in appetite control.
Arcuate nucleus - location of POMC (inhibitory) and NPY/AGRP (stimulatory).
One of their terminal ends is in the paraventricular nucleus which regulates appetite.
Lateral hypothalamus - increase appetitie ( only orexigenic peptides)
Ventromedial hypothalamus - increase satiety ( decreasing appetite)
// Melanocortin system regulates food intake - decreases appeitie
Amygdala - emotiona and memory
What do leptin act on?
Acts on cell receptors in arcuate and ventromedial nuclei-mediate feeding and thermogenesis energy expenditure
Made by adipocytes
What is the mechanism of leptin?
Acts on hypothalamus - decrease food intake, increase glucose and fat metablosim, increase energy expenditure
What gastrointestinal hormones are involved in appetite regulation?
Ghrelin- stimulates appetite and increases gastric emptying and Peptide tyrosine tyrosine (PYY) - inhibits
Secreted by enteroendochrine cells in the stomach, small bowel and pancreas
Function of ghrelin
Increase appetitie
Increase gastric emptying , motility and acid secretion in the lead up to a meal
Stimulates NPY/AGRP. inhibits POMC
Reward, taste, sensation, circadian rhytmn
Function of peptide tyrosine tyrosine
Inhibit NPY/ AGRP
Stimulates POMC
Decrease appetite
Released by terminal ileum and colon in response to food
What blood result differentiates between severe and non severe c. diff?
WCC > 15, CRP > 150
What infection affecting the colon is common with c.diff and what can be seen on examination?
Pseudomembranous colitis
Characteristic yellow-white plaques that form pseudomembranes on the mucosa
Confirmed on endoscopy +/- biopsy
What are the indications for surgery following toxic megacolon?
-Colonic perforation
-Necrosis or full-thickness ischaemia
-Intra-abdominal hypertension or abdominal compartment syndrome
-Clinical signs of peritonitis or worsening abdominal examination despite adequate medical therapy
-End-organ failure
Ulcerative colitis classification
Mild
4 x BMs/day, no systemic toxicity, normal ESR/CRP, mild symptoms.
Moderate
> 4x BMs/day, mild anaemia, mild symptoms, minimal systemic toxicity, nutrition maintained and no weight loss.
Severe
> 6 BMs/day, severe symptoms, systemic toxicity, significant anaemia, increased ESR/CRP and weight loss.
Outline the mechanism, transmission, symptoms and diagnosis and treatment of CHOLERA.
Mechanism: Cholera - acute bacterial disease caused by Vibrio cholerae serogroups O1 & O139
Bacteria reaches small intestine → contact with epithelium & releases cholera enterotoxin.
Transmission:
Transmitted through faecal-oral route
Spreads via contaminated water & food.
Main symptoms :
Severe dehydration & watery diarrhoea
Other symptoms:
Vomiting, nausea & abdominal pain.
When dividing the surface anatomy of the abdominopelvic region into ninths what lines cross where?
Right & Left vertical - midclavicular lines
Top horizontal line - Transpyloric line
Bottom horizontal line - Interspinous line through the 2 ASIS
Describe the colicky nature of Ureter, Intestine, Billiary
- Ureteric colic is defo colic- comes in waves- pain intensity gets high then drops
- Intestinal colic is still colic but less painful than ureteric
- Biliary colic doesn’t have to be true colic as it gets to a high intensity but then fluctuates at that high level
Where does gallbladder (right hypochondriac region) pain radiate?
Through to the back and right- this happens in 50% of cases
Where does stomach, duodenum, pancreas (epigastrium) pain radiate?
- Straight through to back- especially because pancreas and duodenum are retroperitoneal
- People with pancreatic cancer present with back pain because tumour infiltrates posteriorly
Where does tail of pancreas (left hypochondriac region) pain radiate?
Through to the back and the left
S → Central then shifts to right iliac region
O → Gradual
C → Constant
R → No radiation
A → Nausea, anorexia, fever
T → No previous pain
E → Worse on movement
S → Dull ache
Appendicitis
Murphy’s sign
Murphy’s sign is elicited in patients with acute cholecystitis by asking the patient to take in and hold a deep breath while palpating the right subcostal area. If pain occurs when the inflamed gallbladder comes into contact with the examiner’s hand
How do we manage peritonitis pre-operatively then operatively?
- Put NG tube in to empty gastric contents to stop them leaking into abdomen
- NBM or else anything that goes in will go through the hole
- IV fluids
- Antibiotics
Operatively
- Identify aetiology of peritonitis (where hole is)
- Eradication of peritoneal source of contamination
- Peritoneal lavage and drainage
What treatments for gastric perforated ulcers are there?
- Taylor’s approach- conservative treatment if they have localised peritonitis that seems to have sealed off itself and they’re not fit for surgery
- Radical surgery- vagotomy, gastrectomy
Management principles of acute pancreatitis?
- ABC
- 4 principles of management:
- Fluid resuscitation (IV fluids, urinary catheter, strict fluid balance monitoring)
- Analgesia
- Pancreatic rest (with or without nutritional support if prolonged recovery e.g. NJ feeding or PN)
- Determine underlying cause
Define malnutrition
A state in which deficiency, excess or imbalance, of energy, protein or other nutrients, results in a measurable adverse effect on body composition, function and clinical outcome
Causes of malnutrition (3)
Reduced intake
Malabsorption
Altered metabolism
Describe altered metabolism cause of malnutrition
Cuthbertson et al. - There is a % decrease in energy expenditure following injury (shock) for about a day then the body enters a catabolic state to protect itself, the nutritional priority at this point would be covering metabolic needs. This lasts for a couple of days to a week, its at this point the body can now move to anabolic priority and nutrition can be focused to recovering muscle mass.
What is used to diagnose malnutrition?
‘MUST’ calculator
Current weight, height (BMI)
Weight 3 months ago - percentage loss
Acute disease effect - acutely ill and/or no intake in past 5 days
What is involved in the dietician assessment of malnutrition?
Anthropometry
Body composition
Function
Biochemistry
Clinical
Dietary
Social
Physical
Requirements
Indications of nutrition support
Malnourished =
BMI < 18.5 kg/m2 or
Unintentional weight loss >10 % past 3 - 6 / 12 or
BMI < 20 kg/m2 + unintentional weight loss > 5 % past 3 – 6 / 12.
- At risk of malnutrition =
Have eaten little or nothing for > 5 days and / or are likely to eat little or nothing for the next 5 days or longer or
Have a poor absorptive capacity, and / or have high nutrient losses and/or have increased nutritional needs from causes such as catabolism.