Pulm Vascular Disease, Acute Lung injury, & Infections - Gupta Flashcards
Usual source of PE (location?)
DVT from lower extremity
Virchows triad?
hypercoaguable state, stasis, endothelial injury
Consequence of PE depends on what 2 factors?
size of embolus, status of circulation (adequate vs inadequate)
Adequate circulation preventing severe consequence from PE refers to?
Bronchial arterial supply sufficient enough to sustain lung tissue distal to small peripheral emboli
Infarcted lung tissue distal to site of PE has what characteristic features?
alveolar hemorrhage, coagulative necrosis of alveolar septa
Resolving pulmonary infarction has what characteristic features?
After 48 hours, infarcted lung tissue begins to organizing and becomes a paler red–brown due to the conversion of hemorrhage into hemosiderin by macrophages and will eventually form a contracted scar
Examples of non-thrombotic emboli?
air, fat, amniotic fluid, foreign material (i.e. IV drug abuse)
Pulmonary circulation is (what fraction) of systemic pressure?
1/8
Primary pulmonary HTN: predominantly seen in what epidemiologic make up?
young female (3rd to 5th decade)
What inactivating mutation is seen in primary pulmonary HTN? cause of this mutation?
BMPR2 (bone morphogenetic protein receptor type 2, leads to proliferation of vascular smooth muscle
Primary pulmonary HTN genetics?
Autosomal dominant
Secondary causes of pulmonary HTN?
- Chronic obstructive or interstitial lung diseases
- Cardiac disease (congenital or acquired)
- Recurrent thromboemboli
What cardiac disease can cause secondary pulmonary HTN? Mechanism?
Mitral stenosis
- elevated left atrial pressure causes increased pulmonary venous and arterial pressure
Regardless of etiology, all forms of pulmonary HTN are associated with what 3 outcomes?
- medial hypertrophy of the pulmonary muscular and elastic arteries
- pulmonary arterial atherosclerosis
- right ventricular hypertrophy
Microscopic appearance of pulmonary HTN?
plexogenic lesions
3 examples of diffuse pulmonary hemorrhage syndromes (pulmonary vascular diseases)
- goodpasture
- idiopathic pulmonary hemosiderosis
- vasculitis - associated hemorrhage (SLE, Wegener’s)
Goodpasture = autoimmune disorder with circulating antibodies towards ___?
alpha-3 chain of collagen IV
Goodpasture is characterized by destruction of (what) in what organ(s)?
destruction of basement membrane in kidney glomeruli and lung alveoli
Good pasture epidemiology?
men in teens-20s, smokers
Microscopic appearance of goodpasture?
Alveolar basement membrane destruction evidenced by:
- necrosis of alveolar walls
- intra-alveolar hemorrhage
pulmonary edema due to what 2 primary factors?
hemodynamic edema (increased hydrostatic pressure, decreased oncotic pressure) edema due to microvascular injury
Increased hydrostatic pressure resulting in pulmonary edema most commonly associated with what disease?
left heart failure
Left heart failure resulting in pulmonary edema worst in what part of lungs? why?
at bases of lungs, hydrostatic pressure greatest here
Decreased oncotic pressure resulting in pulmonary edema due to what disease?
liver disease (hypoalbuminemia)
Common ways in which patient can develop edema due to microvascular injury?
infections, inhaled smoke and other gases, shock
Microscopic appearance of pulmonary edema?
engorged alveolar capillaries and intraalveolar granules and precipitate
Chronic pulmonary edema microscopic apperance?
alveolar microhemorrhages and resulting hemosiderin–laden macrophages (“heart failure cells”) may be seen
ARDS (acute respiratory distress syndrome) characterized by ? (referring to alveolar capillaries)
diffuse alveolar capillary damage
Onset of ARDS?
rapid