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Hemodynamic Disorders

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Presentation on theme: "Hemodynamic Disorders"— Presentation transcript:

1 Hemodynamic Disorders
Ye Liu (刘 晔) Dept. Pathology, SMC

2 A Healthy circulatory system ♠ Normal blood volumn ♠ Homeostasis
Containing Heart, artery, Vein General circulation Pulmonary circulation Functions Deliver oxygen and nutrients Carry away metabolic wastes A Healthy circulatory system ♠ Normal blood volumn ♠ Homeostasis

3 intravascular pressure osmolarity normal hemostasis Edema
Normal homeostasis vessel wall integrity intravascular pressure osmolarity normal hemostasis Edema Hyperemia & congestion Thrombosis & Embolism Infarction Hemorrhage Shock Three Major Causes of morbidity and mortality ♦ Myocardial infarction ♦ Pulmonary embolism ♦ Cerebral vascular accident

4 EDEMA (水肿) Increased fluid in the interstitial tissue spaces
General & local Pathogenesis Vascular hydrostatic pressure Plasma colloid osmotic pressure Lymphatic drainage

5 EDEMA Increased hydrostatic pressure ( cardiac edema, etc.)
Reduced plasma osmotic pressure (nephrotic, hepatic, malnutrient edema, etc. ) Lymphatic obstruction (filariasis infection — elephantiasis,breast surgery, etc ) Sodium and water retention (ARF, etc) elephantiasis Minimal Change Disease Pitting edema

6 EDEMA Morphology LM: Clearing and separation of the extracellular matrix elements Cell swelling Subcutaneous edema Pulmonary edema Edema of the brain

7 EDEMA Hydrothorax hydropericardium hydroperitoneum (ascites) anasarca
Clinical correlation from annoying to fatal indicate subtle disease benefit or harmful

A local increased volume of blood in a particular tissue Arterial hyperemia (hyperemia,充血) An augmented blood flow inducing arteriolar and capillary dilation Venous hyperemia (congestion,淤血) Accumulation of Blood in Small Veins and capillaries result from drainage difficulty of veins

Active process; Red, raised tempreture, increased volume ; Enhanced function; Congestion: passive process; general of local; Reddish blue color (cyanosis), low temperature, increased volume, edema; Decreased function

10 HYPEREMIA Types Significance Physiological: Shy, exercise, taking Meal
Pathological: Inflammatory, post-decompressed Significance -Benefits Plenty supply of O2, functional enhancement, nutrition substance - Hazards Headache , hemorrhage, stroke

11 CONGESTION Causes: Systemic: general or pulmonary
Cardiac dysfunction (right or left) Local: local venous compression or obstruction External Compression Tumor, Bandage Occlusion of lumen Thrombosis, Embolism Thickening of venous wall Paralysis of neurogenic modulation --- Burn, frostbite

12 CONGESTION Congestive sclerosis
Chronic congestion Raised venous pressure Anoxia Metabolite accumulation Enlarged interendothelial gap Base membrane degeneration Parenchymal Interstitial fibrosis Atrophy Reticular fiber collapsed Increase permeability Degeneration Collagen increased Necrosis Fibroblast proliferation Microscopic scarring Edema Hemorrhage Congestive sclerosis

13 CONGESTION Morphology Grossly hemorrhagic and wet
Microscopically rich of red blood cells in small vessels

14 CONGESTION Lung: Acute pulmonary congestion
Gross: Plump swollen lung with shining pleura, edematous fluid flowing out while cutting the lung LM: Alveolar capillaries highly dilated (rosary- like appearance) and engorged with blood Alveolar cavity filled with eosinophilic edema fluid Manifestation Pink colored foamy sputum

15 CONGESTION Lung: Chronic pulmonary congestion
Gross: Hard, with brown spots scattered —— Brown induration LM: Septa thickened and fibrosis Alveolar spaces containing ‘heart failure cells’— hemosiderin-laden macrophages Manifestation Rusty sputum, dyspnea, etc.

16 CONGESTION Liver: Acute hepatic congestion LM:
— Dilation of central vein and sinusoids with blood — Atrophy, degeneration and necrosis of central hepatocytes

17 CONGESTION Liver: Chronic hepatic congestion
Nutmeg liver Gross: red-brown zones accentuated against the yellow surrounding zones LM: centrilobular necrosis and congestion, and perilobular fatty change; fibrosis Long-standing, severe hepatic congestion: hepatic fibrosis (cardiac cirrhosis)

18 Hemorrhage (出血) Causes Rupture of blood vessels Diapedesis Trauma
Peptic ulcer, aneurism, atherosclerosis Diapedesis Enlarged interendothelial gap (basement membrane injury). The intergrity of the vessels remains intact Injury to vascular wall: sever infection, anoxia, toxins Change in number and quality of platelets uremia, leukemia, idiopathic Disturbance of coagulation mechanism congenital disease, DIC , deficiency of Vit. K

19 hemorrhage The clinical significance
Petechiae Purpuras Ecchymoses Hematoma Hemothorax Hemopericardium Hemoperitoneum hemoarthrosis The clinical significance depends on the volume, the rate of loss and the site. Hemorrhagic shock Stroke

20 Hemostasis & thrombosis
Normal hemostasis Maintain blood in a fluid, clot-free state Localized hemostatic plug <>Thrombosis (血栓形成) Blood clot (thrombus,血栓) formation in cardiovascular system of a living body

21 Hemostasis Three components Events in hemostasis vasoconstriction
Vascular wall Platelets Coagulation cascade Events in hemostasis vasoconstriction primary hemostasis secondary hemostasis antithrombotic counter-regulation

22 Hemostasis & thrombosis
Endothelium Antithrombotic Antiplatelet Anticoagulant fibrinolytic Prothrombotic

23 Hemostasis & thrombosis
Platelet Adhesion Secretion Aggregation Coagulation casecade

24 thrombosis Pathogenesis Endothelial injury Turbulence of blood flow

25 thrombosis Morphology Arterial thrombi Venous thrombi (phlebothrombi)
Originate from injury sites Venous thrombi (phlebothrombi) Originate from the sites of stasis both extends to the heart pale platelet and fibrin layers Lines of Zahn dark erythrocyte-rich layers

26 thrombosis Lines of Zahn

27 thrombosis LM: Platelets Trabeculae + Neutrophil fibrin + red cells

28 thrombosis Types Mural thrombus Occlusive thrombus Globular thrombus
Vegetation Pale thrombus Mixed thrombus Red thrombus Hyaline thrombus Bacterial thrombus Tumor thrombus

29 thrombosis Mural thrombus Vegetation Hyaline thrombus

30 thrombosis Differentiation between thrombus from postmortem clot
Postmortum clots Dry wet and gelatinous “chicken fat” supernatant Rough surface Smooth surface Hard Soft Friable Gelatinous Lines of Zahn Homogenous Firmly attached No attachment Slit due to contraction, fragmentation, generate embolus No slit

31 thrombosis Fate Propagation and obstruction Dissolution Embolization
Organization and recanalization Calcification

32 thrombosis Clinical correlations Venous thrombosis (phlebothrombosis)
Varicosities, embolism (sometimes fatal), DVT, trauma, surgery, post partum Cancer associated thrombosis Cardiac and arterial thrombosis Mural thrombus cardiac infarction, rheumatic heart disease Embolize peripherally, brain, kidney, spleen, etc

33 thrombosis DIC (Disseminated intravascular coagulation)
 Usually happens in many severe disorders severe bacterial or viral infection, allergic disease, anoxia, trauma, shock, malignancy ,etc.  Coagulation System is Activated Microthrombi are Formed in Capillaries of Many Organs Platelets + Fibrin ( lung ,brain ,kidney,liver,GI tract,adrenal gland,etc.)  Consumption of coagulation substance and activation of fibrinolytic system hemorrhage diathesis, mutiorgan dysfunction consumption coagulopathy / defibrination syndrome 消耗性凝血病/ 去纤维蛋白综合征

34 Embolism (栓塞) Occlusion of cardiovascular system by some insoluble mass. The mass is termed “Embolus (栓子)”. Solid, liquid, gaseous mass Thromboembolism 99% Fat, air, amniotic fluid, tumor fragments, bits of bone marrow, etc

35 Embolism Route of emboli Arterial emboli —— systemic embolism
Venous emboli —— pulmonary embolism Portal vein emboli —— hepatic embolism Paradoxical emboli Emboli from veins of the general circulation pass through an atrial or ventricular septal defect, entering arteries of the general circulation. Retrograde emboli

36 Embolism Pulmonary Thromboembolism
Incidence: 20-25/100,000 hospitalized patients Source: >95% from DVT above the knee

37 Embolism Results: (depends on the size, number and the clinical setting) Few Emboli with Small Size : asymptomatic → infarction (pain and dyspnea) Numerous Small Emboli : decrease the volume of pulmonary circulation sharply, pulmonary hypertension and right ventricular failure Medium Sized Emboli: hemorrhage, infarction Large Emboli: sudden death, saddle embolus

38 Embolism Systemic Thromboembolism
Source: 80% from intracardiac mural thrombi; aortic aneurysms, ulcerated AS plaques, vegetations Target sites: lower extremities, brain, intestines, kidney, spleen Consequences: infarction

39 Embolism Fat Embolism Source: Fractures of long bones
Soft tissue trauma Results: ф > 20μm, pulmonary embolism ф < 20 μm, cerebral embolism or other organ embolism Special staining (Sudan III )

40 Embolism Fat Embolism Pathogenesis
obstruction & toxic effect of free fatty acid Symptoms Tachypnea, dyspnea, tachycardia; irritability, restlessness, delirium or coma; anemia and thrombocytopenia

41 Embolism Gas Embolism Exogenic: transfusion, Source: Results:
operation or trauma in the neck or chest, artificial pneumothorax, pneumoperitoneum Endogenic: caisson disease or decompression sickness Results: Small amount of gas may be absorbed Occupies the heart ventricle, interrupted the blood flow cause death Gas embolism in multiple organs (brain, pulmonary)

42 Embolism Amniotic Fluid Embolism
Low Incidence (1/10,0000~80, 000) with high mortality rate (70%~80%) Amniotic fluid may enter vascular system through Sinusoids which placenta attached Torn cervical vessels Emboli consists squamous epithelial cells, lanugo hair, fat, fetal feces, mucin and TXA2 Cause of death multiple embolism; reflex vasoconstriction, pulmonary embolism; allergic shock ; DIC

43 INFARCTION (梗死形成) The formation of a localizad area of ischemic necrosis within a tissue or organ due to impaired arterial supply or the venous drainage The necrosis area is called “infarct”. An extremely important cause of clinical illness: myocardiac infarction cerebral infarction

44 INFARCTION Causes Types
Occlusion of arterial supply or venous drainage Thrombosis, embolism, athermanous plaques, external compression Functional spasm of arteriole Types White infarcts (anemic infarcts) Red infarcts (hemorrhagic infarcts) Septic infarcts

45 INFARCTION White infarction Morphology Arterial occlusion
Solid, compact organs Few collateral circulation (spleen, kidney, heart, brain, etc.) Morphology Gross Dull pale, dry, wedge-shaped necrotic lesion A hemorrhagic zone surrounding

46 INFARCTION LM Ischemic coagulative necrosis
Hemorrhagic zone : inflammatory and granulation tissue. Most undergo organization and scarring in the end.

47 INFARCTION Spleen infarction

48 INFARCTION Cardiac infarction

49 INFARCTION Brain infarction (liquefied necrosis)

50 INFARCTION Red infarction ♦ Arterial occlusion ♦ Venous occlusion
♦ Loose tissue ♦ Dual circulations: lung , small intestine Previously congested Re-established blood flow to a site of previous arterial occlusion and necrosis

51 INFARCTION Hemorrhagic infarction of the lung
Gross Roughly wedged shaped Dark red, solid area Base beneath the pleura Fibrin exudation LM Coagulative necrosis Large amounts of RBC filled in alveolar space Obscure structure

52 INFARCTION Hemorrhagic infarction of the intestine

53 INFARCTION Septic Infarction Bacteria containing emboli
May form abscess and pus

54 INFARCTION Fate of Infarct
♦ Enzymatic lysis, liquefaction and absorption ♦ Organization with scar formation ♦ Encapsulation and Calcification

55 INFARCTION Factors that influence development of an infarct
Nature of the vascular supply Rate of development of occlusion Vulnerability to hypoxia Oxygen content of blood


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