Internal Medicine Tips Tricks and Techniques Part II Flashcards
What are the two major classes of IBD
Ulcerative colitis;
Crohns disease
Where is the inflammation in ulcerative colitis
Limited to the colon and the rectum. Inflammation is limited to the mucosal lining.
Where is the inflammation in crohns disease
transmural inflammation in any part of the entire GI tract
What is the presentation of IBD
diarrhea;
weight loss;
abdominal pain
Crohns disease can also present with
fistula formation;
strictures;
abscesses;
bowel obstruction
How is IBD diagnosed
Endoscopy is the preferred method.
CT and MRI scans;
Serologic markers
What will differentiate crohns disease from UC histopathologically
UC: Chronic mucosal inflammation with crypt abscess and cryptitis;
Crohns: multinucleated giant cells and noncaseating granulomas in CD
What are the serologic markers used to distinguish UC from Crohns
CD: Anti-Saccharomyces cerevisiae antibodies;
UC: pANCA (perinuclear antineutrophil cytoplasmic antibodies)
How is treatment determined for IBD
Based on the severity of the symptoms
How is the severity of disease classified for IBD
Mild;
Moderate;
Severe
What defines mild to moderate disease
UC: less than 4 bowel movements with no rectal bleeding or anemia.;
CD: little to no abdominal pain
What are the medical treatment options for mild to moderate disease
5-ASA; Antibiotics for CD; Budesonide; Topical therapy (limited to left colon)
What are the 5-ASA used
Sulfasalazine; Mesalamine; Olsalazine
Name Mesalamine preparations used for IBD
Asacol Pentasa; Apriso; Balsalazide; Multimatrix delivery system mesalamine
What is budesonide
A synthetic corticosteroid with first pass liver metablism that limits systemic toxicity while retaining local efficacy from high affinity glucocorticoid receptors
What defines moderate to severe disease
CD: Patients that fail to respond to therapy with mild to moderate disease or those that develop significant weight loss, anemia, fever, abdominal pain or tenderness, and intermittent nauseas and vomiting without bowel obstruction.;
UC: Patients with more than 6 bloody bowel movements a day, fever, mild anemia, and elevated ESR
What are the medical treatments used for moderate to severe IBD
Glucocorticoids;
Immunosuppressive agents;
Anti-tumor necrosis factor alpha;
Natalizumab
What immunosuppressive agents are used in the treatment of IBD
6-Mercaptopurine;
azathioprine (6-M’s S-imidazole precursor);
Methotrexate
How does 6-Mercaptopurine work for IBD
causes preferential suppression of T=cell activation and antigen recognition and are useful in maintaining glucocorticoid induced remission in both UC and CD
What will help prevent toxicity caused by 6-mercaptopurine
Determination of thiopurine methyltransferase (TPMT) enzyme activity prior to initiation of therapy
How does methotrexate work for IBD
effective as a steroid sparing agent in CD but not UC.
What are the anti-tumor necrosis factor monoclonal antibodies for IBD
Infliximab;
Adalimumab;
certolizumab pegol
What are the adverse effects of using anti-TNFa
reactivation of a latent tuberculosis;
development of antibodies to infliximab and double stranded DNA
What is natalizumab
a humanized monoclonal antibody to alpha-4 integrin, a cellular adhesion molecule used for moderate to severe CD refractory to all other approaches including Anti-TNFa antibodies
What are the adverse effects of natalizumab
induce reactivation of JC polyoma virus causing progressive multifocal leukoencephalopathy.
When is surgery an option for patients with IBD
patients with fistulas; obstruction; perforations; abscesses; bleeding
What are adverse outcomes of surgery for IBD
Short bowel syndrome;
recurrence close to the resected margins is common with CD
Surgery for UC
a total colectomy may be curative
What defines nephrotic syndrome
Proteinuria >3.5 grams/d;
hypoalbuminemia;
hyperlipidemia
edema
What will biopsy show for nephrotic syndrome
will show injury along the filtration barrier;
thickening of the glomerular basement membrane
fusion of the podocyte foot processes
What is the general medical treatment for nephrotic syndrome
ACE inhibitors and ARBs to reduce intraglomerular pressure;
Aggressive treatment of hypertension can also slow progression of renal disease
What bleeding disorders are often accompanied by nephrotic syndrome
hypercoaguable state and can predispose pt to thromboembolic events
Name the primary glomerular nephropathies
Minimal Change Disease;
Focal Segmental Glomerularsclerosis;
Membranous Nephropathy;
Membranoproliferative
What age groups are most commonly affect by MCD
children;
second peak seen 50-60
How will MCD present
sudden onset proteinuria with hypertension and edema;
Renal insufficiency is unusual
What are associated conditions of MCD
Hodgkins and solid tumors
How is MCD diagnosed
LM: Normal glomeruli;
Electron: shows effacement of the foot processes as the only abnormality
What is the treatment for MCD
oral prednisone for 1mg/kg/d for 8-16 weeks until remission.
Then tapered over the next 3 months
How will Focal Segmental Glomerulosclerosis present
nephrotic syndrome;
HTN;
Renal insufficiency
What are the associated conditions of Focal Segmental Glomerulosclerosis
Obesity;
HIV;
IV Drug use
How is FSGS diagnosed
Immunofluorescense shows staining for C3 and IgM in areas of sclerosis representing areas of trapped immune deposits
How is the prognosis for FSGS determined
the degree of interstitial fibrosis and tubular atrophy
What can be used to treat nephrotic syndromes if they are refractory to oral prednisone
cyclosporine;
cyclophosphamide
How will membranous Nephropathy present
nephrotic syndrome or heavy proteinuria while renal function is often normal
How is disease progression for Nephropathy
1/3 remit spontaneous;
1/3 ESRD;
1/3 intermediate course
What are the associated conditions with membranous nephropathy
SLE;
Viral hepatitis;
syphilis;
solid organ malignancy
How is membranous nephropathy diagnosed
kidney biopsy shows;
LM: thickening of the basement membrane;
Silver stain: “spikes”
Who receives treatment for membranous nephropathy
patients at higher risk for progression (reduced GFR, age >50, and HTN, and males);
Severe nephrotic syndrome (proteinuria >10g/d)
What is the primary cause of Membranoproliferative Glomerularnephropathy
Hepatitis C and frequently in association with cryoglobinemia
How is Membranoproliferative GN diagnosed
LM: mesangial proliferation and hypercellularity with lobularization of the glomerular tuft;
Silver stain: mesangial interpositioning appearance gives a double contour or “tram tracking appearance”
What are the compliment levels for Membranoproliferative GN
usually low
What is the treatment for membranoproliferative GN
treatment has not been shown to improve disease free survival, steroids may stabilize the disease in children.;
If renal function is rapidly declining in the presence of cyroglobulins, plasmapheresis may help stabilize the disease.
Name the hepatotropic viruses
HAV; HBV; HCV; HDV; HEV
What is the classification of HAV
RNA virus that belongs to the Picornavirus family
What is the most common cause of viral hepatitis world wide
HAV
How is HAV spread
fecal-oral route
What is the period of infectivity for HAV
2 weeks before symptoms through 2-3 weeks after symptoms
What are high risk conditions for HAV
anything to do with developing countries
How is the diagnosis made for HAV
detection of IgM anti-HAV antibodies
How is the recovery and immunity phase determined for HAV
detection of IgG anti-HAV antibody
What is the clinical presentation for HAV
All are common but non specific: Malaise; fatigue; pruritus; headache; abdominal pain; myalgias; arthralgias; nausea; vomiting; anorexia; fever
What is the treatment for HAV
no specific treatment, only supportive therapy
What can be used for preexposure prophylaxis
the HAV vaccine containing the single HAV antigen
What can be used for post exposure prophylaxis
Ig
What is the prognosis of HAV
almost all will resolve in 4-8 weeks
What is the classification of HBV
DNA virus that belongs to the hepadnavirus family
What phenotypes of HBV have been found in the US
All phenotypes; The most prevalent being A, B and C
What is the leading cause of HCC world wide
HBV attributes 60-80% of all cases
What percentage of liver transplants is due to HBV
5-10%
What causes liver damage following HBV
immune mediated
What are the modes of transportation for HBV
Parenteral or percutaneous routes; Sexual contact; Vertical transmission (mother to infant)
What is the incubation period after an HBV infection
30-160 days
What are the clinical phases of HBV
Acute hepatitis B;
Chronic Hepatitis B
- Immune tolerant
- Immune Active
- Carrier state with low replication
- Chronic HBeAg negative;
Resolution
What defines immune tolerant phase of HBV
high rates of viral replication, yet normal liver enzymes and low levels of inflammation and fibrosis