Hemodynamics Flashcards
What 3 general pathologic processes lead to edema?
- Altered Endothelial Function
- Increased Vascular Pressure
- Decreased Plasma Protein Content
What 3 major causes of morbidity and mortality in developed countries result from thromboembolism?
- Mycocardial Infarction
- Pulmonary Embolism
- Cerebrovascular Accident
What is hemostatis and what are its 4 phases?
Hemorrhage
Hypotension
Shock
Death
Differentiate between Hemorrhage and Hypotension.
Hemorrhage
- Slower Loss of Blood
Hypotension
- Usually results from a massive loss of blood (multiple leaders)
Thrombosis vs. Embolism
- what substrates can cause embolism?
Thrombosis:
- Inappropriate Clotting
Embolism:
- Migration of Clots
Emboli can be: Coagulated Blood, Amniotic Fluid, Gas, ect.
Hyperemia vs. Congestion
- how does the presentation differ?
- Passive or Active?
Hyperemia:
- ACTIVE - MORE INFLOW
- Active arteriolar dilation and Increased Blood flow
- Results in flushing of the Skin (e.g. skin after exercise)
Congestion:
- PASSIVE - LESS OUTFLOW
- impaired outflow of venous blood from a tissue
- Results in Cyanosis (from deoxyhemoglobin)
What are 4 results of chronic congestion?
- Cell death and Fibrosis
- Elevated Intravascular Pressures
- Edema
- Ruptured Capillaries Producing Focal Hemorrhages
What condition leads to nutmeg liver?
- features?
Chronic Passive Congestion of the Liver
- Red, Depressed central Vein area (in lobule center)
- Outter areas look brown and (liver colored)
***This happens when the liver is poorly perfused like in heart failure
In a histological section how would you differentiate between acute and chronic pulmonary congestion?
Acute:
- Thickened Alveolar Walls (necrotic processes)
- Transudate in Alveolar Lumen
- Dilated Capillaries in Alveolar Wall
Chronic:
- Fibrosis in Alveolar Walls (apoptotic processes)
- HEMOSIDERIN laden macrophages from eating…
- Blood from the alveolar lumen
What are 2 common causes of acute pulmonary congestion?
- Pulmonary Embolism
2. Myocardial Infarction
What are the terms for Edema in:
- Thorax
- Pericardium
- Peritoneum
- Internal and External Organs
Thorax:
- Hydrothorax
Pericardium:
- Hydropericardium
Peritoneum:
- Ascites
- Hydroperitoneum
Internal and External Organs:
- Anasarca
What does edema usually consist of?
Transudate
In what 3 ways does propping your legs up help you to reduce swelling in your legs?
- Decreases Hydrostatic Pressure on Capillaries
- Increases Venous Return
- ?????????
You see a patient with one leg significantly larger than the other, and it displays erythema, and calor. What should be your first thought?
- You should think DVT (deep venous thrombosis)
Why is albumin important?
- abundance?
- what conditions result in albumin loss?
- Major osmoregulatory Protein (maintains oncotic pressure)
- Makes up 1/2 of all plasma Protein
- Loss can lead to reduced Plasma Oncotic Pressure
When do you commonly see peau d’orange?
Failure Breast Lymphatics to Drain because they are obstructed (by cancer etc.)
What causes Filariasis and Elephantiasis?
Blood Parasite
What are some prerenal causes of renal failure?
- Heart Failure
- Shock (sudden and severe drop in blood pressure)
- Other interuptions of bloodflow to the kidneys from sever injury or illness
What are some Intrarenal causes of Renal failure?
Direct Kidney damage via:
- Inflammation
- Toxins
- Drugs
- Infection
- Reduced Blood Supply
What are some Postrenal causes of Renal failure?
URINARY TRACT OBSTRUCTION from: - enlarged prostate - kidney stones - bladder tumor - injury
Poststreptococcal Glomerulonephritis and Acute renal failure have what physiologic effects in common?
They lead to excessive retention of Salt and Water
What is cardiac tamponade?
- So much fluid gets into the pericardial sac that the heart can’t beat anymore (e.g. from Hemopericardium)
What is a hematoma?
Hemorrhage that has accumulated in tissue.
What are petechiae?
- when are they often seen?
1 to 2 mm hemorrhages into the skin or mucosal surfaces
- Platelet Defects
- Vit C deficiency
- Asphyxiation
What are Purpura?
- when are they often seen?
3-5 mm hemorrhages into the skin (or mucosal surfaces)
- Trauma
- Vascularitis
- Increased Vascular Fragility (old ppl.)
what are Ecchymoses?
Bruises
- 1 to 2 cm subcutaneous hematomas
What can be found in dense bodies?
- aka ∂ granules
- ADP and ATP
- Ca2+
- Histamine
- Seratonine
- Epinephrine
What 4 general steps make up Hemostasis and Thrombosis?
- Vasocontriction
- Primary Hemostasis
- Secondary Hemostasis
- Antithrombotic Counterregulation
What Causes the Vasocontriction phase of Hemostasis and Thrombosis?
- Endothelin released from the Damaged Epithelium
* Reflex Vasoconstriction
What are the 5 steps of Primary Hemostasis and what factors are involved?
- what does this process ultimately form?
- Type IV collagen is exposed and Platelets bind to it as well as to vWF
- Platelet binding to vWF is mediated by Gp1b - Platelet changes shape to become flattened
- Platelets release granule contents (ADP most imp) and TXA2
- ADP causes Gp2a/3b upregulation and TXA2 recruits more platelets that stick together
- Platelets aggregate and Primary plug is formed
What are the Steps of Secondary Hemostasis?
- Tissue factor gets released from the cells, coagulation cascade is not triggered (also XII is triggered by exposure of type IV collagen)
- Thrombin is generated
- Fibrin is Polymerized on the Platelets with GpIIb/IIIa binding fibrin and creating bridges between platelets
- Secondary STRONG hemostatic plug is formed