Pathology Flashcards
Risk factors of artherosclerosis?
- : Hyperlipidemia (high LDL is bad, high HDL is good)
- Hypertension
- Smocking
- Homocysteine
- Hemodynamic factors
- Toxins
- Viruses
- Immune reactions
- Estrogen therapy or low estrogen before menopause
Describe the Pathogenesis of endothelial chronic injury
- Risk factors to chronic endothelial injury
- Endothelial dysfunction: monocyte adhesion and emigration
- Macrophage activation and smooth muscle recruitment
- Macrophages and smooth muscle engulfs lipid
- Smooth muscle proliferation, collagen and other ECM deposition, extracellular lipid
- Arherromatous Plaque: necrotic center and fibrous cap in the Intima
What’s the difference between stable and vulnerable atherosclerotic plaque ?
Stable Plaque
- Thickened fibrous cap
- Smaller lipid core
- Less inflammatory agents
Vulnerable Plaque
- Large lipid pool
- Thin fibrous cap
- Many inflammatory cells
* ***Can cause a thrombi, rupture, aneurysm**
What are the infarct terrotories of the different coronary arteries?
In which order to we autopsy the heart?
Open in direction of blood flow: IVC → RA → RV → PA → LA → LV → aorta
What are the types of heart failure?
- Circulatory failure: inability to meet metabolic demands of body
- Cardiac or heart failure: inability to pump at sufficient rate and/or pressure too high
- Circulatory overload/congestion: excess in blood volume
- Congestive heart failure (CHF): cardiac failure + abnormal circulatory congestion
What are the possible Etiologies of heart failure?
- ↓ contractility
- ↓ preload
- ↑ preload or overload
- ↑ afterload
- Electrophysioligical abnormalities (arrhythmias, conduction)
- Aggravating factors (anemia, fever, hyperthyroidism)
What are the 2 main categories of heart failure?
- Systolic dysfunction (½ patients) FORWARD FAILURE
- end-diastolic volume and pressure → pulmonary congestion and edema and ischemia
- Diastolic dysfunction (½ patients) BACKWARD FAILURE
Reduced ventricular compliance causes ↑ end-diastolic pressure for given volume → pulmonary edema
By wich mechanism the heart tries to compensate before being in heart failure?
- Frank-Starling mechanism
- Activation sympathetic nervous system
- Renin-angiotensin system, aldosterone, ADH
- Hypertrophy (Laplace equation)
- Volume overload → ↑ stress by ↑ radius → sacomeres replicate in serie → ↑ length sarcomeres → ECCENTRIC HYPERTROPHY
- Pressure overload → stress by pressure → sacomeres replicate in parallel ↑ diam. sarcomeres → CONCENTRIC HYPERTROPHY
- Dilatation
↑ EDV → ↑ radius → ↑ stress of myocardium → stretches → pulmonary edema
How doest heart failure manifests itself in the heart itself?
- Left heart failure
→ Dyspnea, orthopnea, fatigue, paroxysmal nocturnal dyspnea
- Right heart failure
→ Jugular venous distention, hepatomegaly, peripheral edema
What are the systemic manifestations of heart failure?
- Lungs: acute (pulmonary oedema in capillaries → interstitial → alveolar) OR chronic (brown induration), we can measure with the wedge pressure (pulmonary capillary pressure – left atrial pressure) with with a balloon
- Liver: ↑ hepatic venous pressure congestive hepatomegaly, centrilobular congestion ± hepatocyte necrosis → pain, altered liver function tests and portal hypertension → congestive splenomegaly
- Pleural, pericardial, peritoneal effusions
- Edema subcutaneous tissue → pedal edema
What are the types of cardiomyopathies?
- Dilated [dilatation + systolic dysfunction]
Most common, transplantation cause, high mortality, caused by alcohol, pregnancy, nutrition, myocarditis, fat and fibrotic heart
- Hypertrophic [hypertrophy + diastolic dysfunction]
Cause of sudden cardiac death, genetic, without outflow obstruction of with outflow obstruction
- Restrictive [restriction + diastolic dysfunction]
Genetic, familial amyloidosis
- Unclassified
What are the types of shock ?
- Hypovolemic
- Cardiogenic
A. Myocardial, valvular
B. Electrophysiological
C. Pericardial - Septic
- Other
A. Neurogenic
B. Hypo-adrenal
C. Anaphylactic - Post-traumatic
Mixed of hypovolemic, tissue damage and septic
What is the pathogenesis of hypovolemic shock?
- stroke volume → ↓ cardiac output → ↓ blood pressure
- Severe: > 40% blood loss
- Compensation/decompensation: Se, Renin-angiotensine, hematocrit fall → ischemia, hypoxia, cell damage and death
What is the pathogenesis of septic shock?
Deregulated host response to infection, Organ dysfunction assessed by the Sequential [sepsis-related] organ failure assessment (A SOFA score of 2 = mortality risk of ~10%)
Primary cause of death from infection, may be occult but may be the cause of new-onset organ dysfunction
Effects include:
- Systemic necrosis (circumferential subendocardial infarct in the heart, tubular and cortical in kidney and adrenal necrosis and hemorrhage)
- Acute respiratory distress syndrome: diffuse alveolar damage + acute exudative phase of ARDS → edema and hyaline membranes: that resolves in (1) resolution, (2) proliferative phase or (3) fibrotic phase
- GI tract: gastric erosions, acute ulcers and severe ischemic necrosis in intestine
- Liver: abnormal liver function
- Brain: micro-infarcts
