Module 5 : Infectious And Inflammatory Disease Flashcards
3 most common clinical presentations of an infection
- fever
- pain
- leukocytosis
What is leukocytosis
- increase number of white blood cells
What two things are important when patient presents with fever of unknown origin (FUO) and why
- history = immunocomprimised, chemo, chronic disease
- lab tests = can tell you what organs are being affected
What should we look for with FUO in relation to organ size
- organomegally in acute stage
What can infectious processed lead to
- abscess
What is an abscess and what is it a complication of
- localized collection of pus
- complication to infection
Which type of patients are more at risk for abscesses
- diabetics
- immunosuppressed patients
- cancer patients
- patients with hematoma
- post op
What symptom do patients with abscesses present with
- localized tenderness
Sonographic appearance of an abscess
- fluid filled area
- posterior enhancement
- thick irregular walls
- debris
- possible gas (with dirty shadowing)
What is hepatitis and what is it caused by
- inflammation of the liver
- caused by viruses and toxins (cleaning supplies, Tylenol)
What are 4 signs and symptoms of hepatitis
- fever
- chills
- nausea and vomitting
- possible jaundice
How many types of viral hepatitis are there, and what are the 4 we talk about
- 6
- hep A, B, C, D
What is the primary mode of spread for hep A
- fecal-oral route
What is the primary mode of spread for hep B
- blood and body fluids
- carrier state
What it’s he primary mode of spread for hep C
- transfusions
What is the primary mode of spread for hep D
- dependant on hep B (have to be infected with hep B before hep D)
- IV drug users
Three different clinical presentations of hepatitis
- acute
- subfulminant/fulminant
- chronic
Clinical presentation of acute hepatitis
- clinical recovery within 4 months
- usually hep A
Clinical presentation of subfulminant/fulminant hepatitis
- due to hep B or drug toxicity
- hepatic necrosis
+ death of patient occurs if > 40% of hepatic parenchyma lost
Clinical presentation of chronic hepatitis
- biochemical markers remain abnormal for > 6 month
Sonographic appearance of acute hepatitis
- hepatomegaly
- decreased liver echogenicity
- prominent portal vein walls (starry sky appearance)
- GB wall thickening
- MOST OFTEN LIVER IS NORMAL
Sonographic appearance of chronic hepatitis
- coarse liver parenchyma (heterogenous)
- overall increase in echogenicity
- portal hypertension, cirrhosis (liver decreases in size)
+ splenomegaly
Lab values affected with hepatitis
- ALT
- AST
- bilirubin
4 routes of spread by progenitor bacteria to the liver
- biliary tract (cholecystitis)
- portal venous system (diverticulitis, appendicitis)
- hepatic artery (endocarditis from heart)
- trauma (blunt or penetrated)
What is pyogenic bacteria
- produces pus
Clinical presentation of bacterial infection
- fever
- RUQ pain
- malaise (general feeling of unwell ness)
- anorexia (loss of appetite results in weight loss and muscle deterioration)
Sonographic appearance of bacterial liver infection
- simple to complex cyst
- shaggy wall
- internal separations
- echogenic foci with posterior reverberation ( gas = dirty shadow)
Two types of fungal disease
- candida
- pneumocystis
What is candida and who does it usually affect
- yeast infection
- typically infects immunocompromised patients
Clinical presentation of candida
- persistent fever
- WBC count returning to normal
Sonographic appearance of candida
- UNIFORMLY HYPOECHOIC (MOST COMMON)
- hyperechoic
- bulls eye appearance
- wheel within a wheel appearance
- liver kidney and spleen involvement
What is the bulls eye appearance
- focal areas of hypoechoic rim with hyperechoic center
What is the wheel within a wheel appearance
- hypoechoic rim with hyperechoic center, and hypoechoic nidus (dot) in very center
What is pneumocystis carinii and who does it commonly affect
- an opportunistic infection
- affects immune compromised patients (aids)
What is an opportunistic infection
- wont effect people with normal immune system
- goes after weak immune system people
What other structures are involved with pneumocystis carinii
- LIVER (most common)
- spleen
- renal cortex
- pancreas
- lymph nodes
Sonographic appearance of pneumocystis
- DIFFUSE, tiny non shadowing, echogenic foci
- progresses to shadowing clumps of calcification
Three parasitic diseases
- amebiasis
- hydatid (echinococcal) disease
- schistosomiasis
What is the primary route of spread to the liver with amebiasis
- fecal-oral route
Route of travel to the liver with amebiasis
- travels from colon, through PORTAL VEINS, to teh liver
Which lobe of the liver is most commonly affected by amebiasis and why
- right lobe is more commonly affected
- may be due to a gravity thing
Sonographic appearance of amebiasis
- round/oval in shape
- hypoechoic
- fine internal echoes
What is the most common clinical presentation of amebiasis
- PAIN
- diarrhea
What is hydatid (echinococcal) disease
- parasitic infection (tapeworm)
What type of countries are hydatid disease more common in
- sheep and cattle raising countries
What structures can be affected of hydatid disease
- LIVER (MOST COMMON)
- spleen
- ureter
- bladder
- kidneys
What is the definitive host of a hydatid tape worm
- dogs
What is the definitive host
- the host in which the parasite reaches maturity
Who is the intermediate host of a hydatid tapeworm
- humans
What is the intermediate host
- a host in which the parasite undergoes development but does not reach maturity
How does the hydatid tapeworm spread to humans
- fecal-oral route
How does the parasite travel to the liver adn what lobe is most affected
- via the portal venous system
- right lobe is more commonly affected
What are the three layers of the embryo cyst of the parasite
- ectocyst
- pericyst
- endocyst
What is the ectocyst
- external membrane (1mm)
What is the pericyst
- dense connective tissue capsule around the cyst
- body tries to protect itself by walling off the cyst
What is the endocyst
- inner germinal layer
What is the order of the layers of the embryo parasitic cyst (outer to inner)
- pericyst
- ectocyst
- endocyst
What are the 4 sonographic appearances of the parasitic embryo
- hydatid sand (cyst full of low level echoes)
- simple cyst
- daughter cyst (multiple cysts within a cyst)
- calcified walls
5 signs and symptoms of hydatid disease
- dependant on stage
- pain/discomfort
- jaundice
- vascular thrombosis/ infarction (cysts compress veins of the liver)
- anaphylactic shock (from cyst rupture allergic reaction)
What is the treatment of hydatid parasitic disease
- surgery
- only safe option so rupture does not occur
what type of infection is schistosomiasis
- parasitic infection
how do the worms travel to infected organs in schistosomiasis
- worms penetrate the skin and trace to the mesenteric veins via lymph and blood vessels
what organs do worms invade in schistosomiasis
- liver
- spleen
- bowel
- bladder
how can schistosomiasis lead to cirrhosis
- ova penetrate portal vein wall and connective tissue
- this leads to a granulomatous reaction (inflammatory response) and periportal fibrosis
- this leads to portal hypertension and cirrhosis
sonographic appearance of schistosomiasis
- thickening/increased echogenicity of the periportal wall
- initially liver is enlarged
- then liver shrinks due to hypertension
- splenomegaly
- thickened bladder wall (only if bladder affected)
what type of infection is tuberculosis (TB)
- opportunistic infection
where does TB start and what organs does it infect
- lungs
- spleen, adrenal glands, urinary tract
sonographic appearance of spleen with TB
- tiny echogenic foci with or without shadowing
sonographic appearance of adrenal gland with TB
- acute = bilateral diffuse enlargement
- chronic = atrophied and calcified (may not see adrenals themselves just calc)
what other disease of adrenal could result from TB
- Addisons disease
- TB lead to adrenal atrophy and hypoadrenalism
what is peritonitis
- inflammation of the peritoneum
what are the types of the cases of peritonitis
- infectious
- non infectious
what are the 4 infectious causes of peritonitis
- bacteria
- viruses
- fungi
- parasites
what are the 2 non infectious causes of peritonitis
- pancreatitis
- foreign bodies (TALC)
what do patients with peritonitis present with
- severe pain
what group of people does tuberculosis peritonitis target
- immunocompromised
+ aids, cirrhosis, alcoholics
what is the sonographic appearance of tuberculosis peritonitis
- exudate fluid
- lymphadenopathy
what are the 2 types of cholecystitis
- acute
- chronic
what is the most common cause of acute cholecystitis
- impacted stone
+ interference in blood supply leads to an inflammatory reaction
+ predisposes the patient to infection
is acute cholecystitis more common in females or males
- females
what is the clinical presentation of acute cholecystitis
- RUQ pain, fever, leukocytosis
- nausea and vomiting
- jaundice
what are the 7 sonographic signs of acute cholecystitis
- GB wall > 3mm
- hyperaemia
- gallstones
- impaction at neck
- GB hydrops (dilated GB)
- pericholecystic fluid (fluid around GB)
- postive Murphys sign
what lab values will be affected with acute cholecystitis
- bilirubin
- ALP
- leukocytosis
- AST
- ALT
what are the 5 complications of acute cholecystitis
- empyema (pus in bile)
- gangrenous cholecystitis
- emphysematous cholecystitis
- perforation
- abscess
what is gangrenous cholecystitis and what is the patient presenting with
- necrosis of the gall bladder
- no pain
ultrasound appearance of gangrenous cholecystitis
- no layering bands of echogenic tissue within the GB lumen
where does perforation occur in the gall bladder and why
- occur at fundus
- most distal from where the blood supply is
ultrasound appearance of perforation
- free fluid in peritoneal cavity
- low level collection adjacent to the GB
- ill defined hypo echoic mass surrounding the GB
- may identify perforation
what is emphysematous cholecystitis caused by and is it common or rare
- caused by gas forming bodies
- progress rapidly
- diabetes
- rare
who is more effected by emphysematous cholecystitis men or women
- men
what is acalculous cholecystitis
- inflamed gallbladder without stoned
who is most commonly affected by acalculous cholecystitis
- critically ill patients
4 predisposing factors to aclaculous cholecystitis
- trauma
- previous unrelated surgery
- burn victims
- hyperalimentation (IV nutrition)
will patients with aclalculous cholecystitis experience pain usually
- won’t have pain because ill patients in hospital hopped up on pain meds
ultrasound appearance of acalculous cholecystitis
- similar to acute cholecystitis nut without stoned
what is the most common form of symptomatic gallbladder disease
- chronic cholecystitis
what are the 4 clinical presentations of chronic cholecystitis
- intolerance to fatty foods
- belching/indigestion
- postprandial RUQ pain
- N&V
ultrasound appearance of chronic cholecystitis
- thick heterogeneous wall
- contracted GB wall with gallstones
- WES signs
what lab values will be effected with chronic cholecystitis
- ALT
- bilirubin
- AST
- ALP
3 complications from chronic cholecystitis
- bouveret syndrome
- gallstone illeus
- mirizzis syndrome
what is bouveret syndrome
- gastric outlet obstruction
- gallstones lodge in duodenum and block stomach contents
what is gallstone ileus
- distal bowel obstruction
- gallstones lodge at ileocecal valve
what is chronic cholecystitis associated with
- gallbladder carcinoma
what is mirizzi syndrome
- impacted stone in the cystic duct, GB neck, or Hartmanns pouch
- the CHD becomes compressed (extrinsic) by the stone or inflammatory reaction and results in jaundice
what abnormality will form between the cystic duct and CHD with mirizzi syndrome
- fistula
3 clinical symptoms of mirizzi syndrome
- fever
- pain
- jaundice
ultrasound appearance of mirizzi syndrome
- dilated bile ducts above the level of obstruction
- CBD normal
what is xanthogranulomatous cholecystitis
- rare form of chronic inflammation
ultrasound appearance of xanthogranulomatous cholecystitis
- hypo echoic nodule/bands in a thick GB wall
- represents fatty granulomatous nodules
in what age group and gender is porcelain gallbladder most common in
- older women
- 6th decade of life
is porcelain gallbladder common or rare
- rare
what is the cause of porcelain gallbladder
- idiopathic
- unknown
what disease has a high association with porcelain gallbladder
- GB carcinoma
what is associated with porcelain gallbladder
- stones
- may be a form of chronic cholecystitis
ultrasound appearance of porcelain gallbladder
- calcified GB wall
is cholangitis common or rare
- rare
what is cholangitis
- inflammatory and fibrosing disorder of the biliary tree
what are the 5 types of cholangitis
- acute (bacterial)
- recurrent pyogenic
- AIDS
- biliary ascariasis
- primary sclerosing
what is acute (bacterial) cholangitis caused by
- due to biliary obstruction (choledochalithiasis)
what is the clinical presentation of acute cholangitis
- fever
- RUQ pain
- jaundice
sonographic findings of acute cholangitis
- dilated biliary tree with thickened walls
- stones in biliary tree
- liver abscess
what lab values are increased acute cholangitis
- WBC
- ALP
- bilirubin