Pathology Day 2 Flashcards
In what stage of wound healing do you see clot formation?
Inflammatory (up to 3 days after wound)
What are the time periods for the 3 stages of wound healing?
- Inflammatory = 0 days - 3 days
- Proliferative = 3 days - weeks
- Remodeling = 1 week - 6 months
*memory: If you take a week (7 days) and split it in half, you get the layout…. 0-3, 3-7, and 7+
In what stage of wound healing do you see angiogenesis?
Proliferative (granulation tissue= angiogenesis and fibroblasts)
In what stage of wound healing do you see wound contraction?
Proliferative (the myofibroblasts in the granulation tissue pull it in)
In what stage of wound healing do you see clot dissolution?
Proliferative (clot formation = inflammatory)
In what stage of healing do you see type 1 collagen?
Remodeling (type 3 is replaced by type 1, with the help of collagenase and zinc)
Why does vitamin C deficiency cause delayed wound healing?
Because vitamin C is a co-factor for the hydroxylation of proline and lysine residues on pro-collagen, so that the alpha triple helix can be made –> no hydroxylation = looser triple helix
Why does zinc deficiency cause poor wound healing?
Collagenase (removes type 3 collagen to be replaced with type 1) needs zinc as a cofactor
What are the 8 infectious diseases that cause granulomas?
- Bartonella henselae (cat scratch disease)
- Francisella tularensis
- Listeria monocytogenesis (infantiseptica)
- M. leprae (Leprosy/Hansen disease)
- M. tuberculosis
- Treponema pallidum (syphilis… tertiary only)
- Schistosomiasis
- Fungal infections
What vessel polyangiitis disease cause granulomas? How is each diagnosed?
- Wegeners (Granulomatosis with polyangiitis) – bloody nose, cough, urine
* *C-ANCA** - Churg-Strauss (Eosinophilic granulomatosis with polyangiitis) - asthma, neuropathy
* *P-ANCA**
What stain do we use for TB?
AFB
What stain do we use for fungi?
silver
Which abdominal problem causes granulomas?
Crohn’s disease
How are granulomas maintained?
Th1 -> IFN gamma -> macrophages -> TNFalpha
*memory: T-I-Me To make a granuloma (Th1, iiiiinterferon, mmmmacrophages, tttttnf)
Before starting anti-TNF alpha therapy for ankylosing spondylitis, what other disease must you check for?
Tuberculosis, because anti-TNFalpha drugs can cause sequestering granulomas to break down, leading to disseminated TB
Transudate vs. exudate: Which is protein rich?
exudate
Transudate vs. exudate: Which is cellular?
exudate
What is the cutoff for a specific gravity value of transudate vs. exudate?
1.020 (exudate is higher, transudate is lower)
What 3 processes cause exudate?
- Inflammation
- Malignancy
- Lymphatic obstruction
What 3 processes cause transudate?
- Heart failure (increased hydrostatic pressure)
- Cirrhosis (decreased oncotic pressure)
- Sodium retention
What is the physiologic reason why ESR indicates inflammation?
Products of inflammation, like fibrinogen, coat RBCs and cause them to aggregate, which makes them heavier, so they will have a higher ESR
Does PREGNANCY cause a high or low ESR?
high
Does SICKLE CELL cause a high or low ESR?
Low (sickled cells don’t fall as fast, they have like little parachutes)
Does POLYCYTHEMIA cause a high or low ESR?
Low (dilutes out aggregation factors)