Disorders of the SI & Colon - Exam 3 Flashcards
The small intestine begins at _____ and ends at the ______
pylorus of the stomach and ends at the ileocecal junction
What are the 3 phases of digestion?
intraluminal
mucosal
absorptive
phases of normal digestion: _______ dietary fats, proteins, carbs are hydrolyzed and solubilized by pancreatic and biliary secretions
intraluminal
phases of digestion: _________ requires sufficient surface area of intact small intestinal epithelium
__________ are important in the hydrolysis of disaccharides and di-and tripeptides.
Malabsorption of specific nutrients may occur as a result of a deficiency in an isolated _________.
mucosal
brush border enzymes
brush border enzyme
phases of normal digestion: _______ Impaired absorption of chylomicrons and lipoproteins may lead to steatorrhea and significant enteric protein losses
Impaired absorption of chylomicrons and lipoproteins may lead to steatorrhea and significant enteric protein losses
Fats are broken down by ______ to monoglycerides and fatty acids that form _____ with bile salts. What phase of digestion?
pancreatic lipase
micelles
intraluminal
Impaired absorption of ______ and _______ may lead to steatorrhea and significant enteric protein losses. What phase of digestion?
chylomicrons
lipoproteins
absorptive
What is gluten? Where are 4 places it is commonly found?
protein found in many grains
wheat, rye, barley and flour
celiac disease results in diffuse damage to the ______ with malabsorption of nutrients. Is it permanent or transient?
proximal small intestinal mucosa
PERMANENT!!
When does celiac present? What is the MC patient?
childhood or early adulthood
white people with a family history
What is the pathophys behind celiac disease? What will it look like on colonoscopy?
Dietary gluten triggers immune responses that damages proximal small intestine mucosa and cause VILLOUS atrophy which results in malabsorption of nutrients.
also causes humoral immune and slight T-Cell mediated response causing antibody production
will look smooth!
Diarrhea, Steatorrhea, Flatulence
Bulky, foul-smelling, floating
Dyspepsia
Weight loss
Abdominal distention
Weakness, Muscle Wasting
Growth Retardation in Children
What am I?
celiac disease- classic presentation
Fatigue, Depression
Iron-Deficiency Anemia, Vitamin B12 or Folate deficiency
Osteoporosis, bone pain
Amenorrhea, Infertility
Easy Bruising
Peripheral neuropathy, Ataxia
Dermatitis herpetiformis
Delayed puberty
Increased risk for gastric cancer
What am I?
atypical presentation of celiac disease
What is dermatitis herpetiformis? What dz is it associated with?
Pruritic papulovesicular rash - itchy autoimmune reaction
Extensor surfaces of extremities and trunk, scalp, and neck
celiac disease
**______ is the SCREENING LAB test used to help dx celiac dz? When do levels usually become undetectable? What is the important education point?
IgA TTG (tissue transglutaminase) antibody tests
undetectable after 6-12 months
pt needs to continue to eat gluten until the test is completed
What is the test that needs to be ordered to CONFIRM the dx of celiac? What anatomical location specifically? What will it show?
Endoscopic EGD mucosal biopsy of the proximal and distal duodenum is the standard method for confirmation of the diagnosis in pts with a positive serologic test for celiac
proximal and distal duodenum specifically
Blunting or a complete loss of intestinal villi
What is the management for celiac disease? When can the pt start to see improvement in symptoms?
remove all gluten! for LIFE
s/s improvement within 1-2 weeks
What is Whipple disease? How common? What is the predisposing factor? How is it transmitted?
gram-positive, non-acid fast, PAS positive bacillus
immunocompromised
fecal-oral transmission
Arthralgias
Diarrhea
Abdominal pain
Weight loss
flatulence
steortorrhea
low-grade fever
enlarged joints
lymphadenopathy
What am I?
What is the first symptom noted?
What is the MC symptom?
Whipple disease
Arthralgias- first symptom
weight loss- MC symptom
How is the dx of Whipple disease established? What will the test show?
upper endoscopy with biopsy
Macrophages containing gram-positive bacilli (periodic acid-Schiff [PAS] positive macrophages)
What do you need to do if upper EGD comes back inconclusive for Whipple disease? **What finding is pathognomic for Whipple disease?
PCR confirms diagnosis
Macrophages containing gram-positive bacilli (periodic acid-Schiff [PAS] positive macrophages)
**What is the tx for Whipple disease?
IV Ceftriaxone 1g QD for 2-4 weeks. Followed by trimethoprim-sulfamethoxazole (Bactrim) BID for 1 year
need BOTH
What is SIBO? What are four underlying causes?
Small Intestine Bacterial Overgrowth
A condition in which colonic bacteria are seen in excess in the small intestines; when present, intestinal symptoms can arise
Motility disorders
Anatomic disorders (adhesions from prior surgeries)
Other metabolic disorders (Diabetes)
Immune disorders
can be asymptomatic until vitamin deficiencies arise
bloating
flatulence
diarrhea/steatorrhea
weight loss
What am I?
What is an important history factor?
How can the dx be confirmed?
SIBO
history of GI surgery
by small intestine aspiration with bacterial cultures but NOT often done because it is invasive
What is the NON-INVASIVE diagnostic test for SIBO? How does it work? What is the important pt education? ** What is important pt education?
Carbohydrate breath test
carbohydrate substrate (lactulose/glucose) is given to the pt and if SIBO is present the bacteria consumed the carb and leads to an early peak in breath hydrogen levels which are measured in the pt’s breath
ONE day before test: Stop using all medications related to your GI tract, i.e., any medication used for acid suppression, abdominal pain/spasm, diarrhea, or constipation.
NO carbohydrates in the following categories: bread, pasta, potatoes, rice, crackers, oatmeal, cereals, or any other starchy food products
** What is the tx for SIBO?
Ciprofloxacin 500mg BID preferred for 7-10 days
What is short bowel syndrome due to? What are the symptoms?
Secondary to removal of portion of small intestine
Due to Crohn’s disease, ischemia, tumor, trauma, mesenteric infarction, volvulu
depend on the amount of bowel removed
What are the s/s of a terminal ileal resection? Extensive bowel resection? What is considered extensive?
Results in malabsorption of B-12 and bile salts
Characterized by weight loss and diarrhea d/t nutrient malabsorption
> 50% of the total length of small intestine
What is the management for acute phase short bowel syndrome? adaptation phase?
Initial 3-4 weeks after resection
Stabilize large fluid/electrolyte losses
Acid suppression with PPI IV
Parenteral nutrition, graduating to enteral feeding
Transition to oral feedings in slow and stepwise manner over a period of weeks to months
Complex carbohydrates
Low fat
Fluid management
PPIs
Antidiarrheals when needed
Antibiotics for SIBO
What is the cause of lactose intolerance? What is the role of said cause? What is the tx?
deficiency of lactase
enzyme that hydrolyzes the disaccharide lactose into glucose and galactose
tx: avoid lactose and may try lactase supplementation (Lactaid)
What do you confirm diagnosis of lactose intolerance? describe the test. What is the important pt education point?
confirmed with hydrogen breath test
After ingestion of 50g of lactose, a rise in breath hydrogen within 90 minutes is a positive test
pt need to fast 8 hours prior to test
What is paralytic ileus? What is the highlighted symptom?
A condition in which there is neurogenic failure or loss of peristalsis in the intestine in the absence of any mechanical obstruction
ABSENCE of mechanical obstruction
When is paralytic ileus commonly seen? What is the common time frame associated with return to “normal” GI motility following surgery?
commonly seen in hospitalized pts following:
Intra-abdominal processes such as recent GI or abdominal surgery
Peritoneal irritation (pancreatitis, hemorrhage)
Severe medical illness (pneumonia, sepsis, respiratory failure)
Medications that affect intestinal motility (opioids, anticholinergics)
small intestinal motility usually normalizes first, followed by the stomach (after 24-48 hours, then colon (48-72 hours)
What is the pathophys behind paralytic ileus?
Intestinal manipulation activates a network of local macrophages triggering an inflammatory response that results in muscle dysfunction
Inhibitory neural reflexes are thought to act locally through noxious spinal afferent signals that increase inhibitory sympathetic activity in GI tract with result in slowing motility
What effect do opioids have on the ileus?
decrease GI tract motility by increase resting tone while decreasing motility and emptying
N/V/obstipation, abdominal discomfort
Abdominal distention with tympany to percussion
Diminished/Absent bowel sounds
Diffuse abdominal pain
What am I?
What should be ordered as part of the work-up? What will they show?
paralytic ileus
Plain films
Distended/dilated GAS- filled loops of bowel, colon and rectum
What is the tx for paralytic ileus?
complete bowel rest, IV fluids and NG tube
slowly advancing diet
ACTIVITY!!! get the pt up and moving
remove drugs that reduce intestinal motility
What is the prevention for paralytic ileus?
If possible, avoid IV opioids
Early ambulation, initiation of clear liquid diet
Gum chewing
Why do you need to NOT chew gum before surgery?
The physiologic process behind this theory about gum is that chewing stimulates the vagus nerve, which promotes peristalsis and the release of normal GI tract hormones
What is a small bowel obstruction? When is considered a simple/partial obstruction?
MECHANICAL obstruction
Simple/partial obstruction occludes lumen only
What can a full small bowel obstruction lead to?
Full with strangulation impairs blood supply and can lead to necrosis of intestinal wall
What will the bowel look like before and after the small bowel obstruction? What is the smooth muscle doing? What are the intramural vessels doing?
Obstruction leads to progressive DILATION of intestines proximal to blockage, while distal to the blockage the bowel will DECOMPRESS
Activity of smooth muscle of small bowel increases in an attempt to propel contents past obstruction
If bowel dilation is excessive, the intramural vessels of the small intestines become compromised leading to decreased perfusion and ischemia/necrosis
**70% of small bowel obstructions are caused by _________. What is the hallmark symptom of SBO?
post-surgical adhesions
dehydration
Acute presentation
Nausea/vomiting
Colicky abdominal pain
Obstipation
High-pitched “tinkling” sounds with auscultation
dehydration
may have fever
What am I?
small bowel obstruction
If the SBO is proximal, what are some s/s? Distal?
Proximal: profuse emesis containing undigested food, upper abd. discomfort
Distal: diffuse and poorly localized crampy abdominal pain +/- Feculent vomiting
What will the bowel sounds present like in SBO?
early: hyperactive bowel sounds because bowels are trying to push the obstruction through
later: hypoactive bowel sounds
What are the s/s of intestinal ischemia?
Fever: temperature >100°F
Tachycardia: >100 beats/min
Peritoneal signs:
guarding, rigid abdomen, rebound tenderness, pain out of proportion to the examination